SECTION 6C1-2A - DIAGNOSTIC TABLES -

V6 SUPERCHARGED ENGINE

IMPORTANT:

Before performing any Service Operation or other procedure described in this Section, refer to Section 00

CAUTIONS AND NOTES in VX Service Information for correct workshop practices with regards to safety

and/or property damage.

SYSTEM COMPONENT LOCATIONS

Figure 6C1-2A-1 Engine Compartment Component Locations Supercharged Engine

1. Fuel Pump (Inside Fuel Tank)

2. Fuel Tank

3. ECC In –Car Air Temperature Sensor

4. Fuel Pressure Regulator

5. Exhaust Gas Oxygen (O2S) Sensor (Two)

6. Engine Harness (PCM) Earth (Two Terminals)

7. Idle Air Control (IAC) Valve

8. Throttle Position (TP) Sensor

9. Mass Air Flow (MAF) Sensor

10. Tachometer Lead

11. Powertrain Control Module (PCM) (Inside

Vehicle)

12. Intake Air Temperature (IAT) Sensor

13. Fuel Injectors

14. Ignition Coils

15. Engine Coolant Temperature (ECT) Sensor

16. DIS Module

17. Air Cleaner

18. Crankshaft Position (CKP) Sensor

19. A/C Refrigerant Pressure Sensor

20. A/C Accumulator

21. Engine Cooling Fans (Two)

22. Crankshaft Position (CKP) Sensor

23. Oil Pressure Switch

24. Camshaft Position (CMP) Sensor

25. Detonation Knock Sensors (KS) (Two)

26. Engine Harness (PCM) Earth (Two Terminals)

27. Battery

28. Battery Harness Fusible Link Housing

29. Engine Compartment Relay Housing

30. Engine Compartment Fusible Link Housing

31. Engine Compartment Fuse/Relay Center

32. ABS

33. Brake Hydraulic Failure Switch

34. EVAP Canister Purge Solenoid

35. Diagnostic Link Connector (DLC)

36. BCM

37. Check Powertrain Malfunction Indicator Lamp(MIL)

38. Fuel Pump Control Module (Rear Compartment)

39. Vehicle Speed Sensor (VSS)

434

21 21

789

12 18

4195

Figure 6C1-2A-2 Engine Compartment Relay Locations

1. Fan 1 Fusible Link FU 15. Start Relay

2. Fan 2 Fusible Link FT 16. Headlamp High Beam Relay

3. Engine Fan Relay (Low Speed) 17. Fuel Pump Relay

4. Lighting Fusible Link FQ 18. Front Wiper Relay

5. ABS Fusible Link FR 19. Headlamp Low Beam Relay

6. Engine Fusible Link FS 20. Injectors / Ignition Fuse F35

7. Main Fusible Link FJ 21. Injectors / Ignition Fuse F34

8. Blower Fusible Link FY 22. Engine Sensors Fuse F33

9. Engine Cont. (EFI) Relay 23. Automatic Transmission Fuse F32

10. Horn Relay 24. Engine Control / BCM Fuse F31

11. A/C Relay 25. LH Headlamp Fuse F30

12. Theft Horn Relay 26. RH Headlamp Fuse F29

13. Fog Lamp Relay 27. Fuel Pump Fuse F28

14. Engine Fan Relay (High Speed) 28. Throttle Relaxer Control Module Fuse F36

Figure 6C1-2A-3 Compartment Locations Supercharged Engine

1. Throttle Position (TP) Sensor

2. Idle Air Control Valve (IAC)

3. Anti-Boost Solenoid Valve

4. Engine Coolant Temperature (ECT) Sensor

5. Injectors

6. Direct Ignition System Module

7. L.H. Knock Sensor (KS)

8. Crankshaft Position (CKP) Sensor

9. Ignition Coils (3 places)

10. Bypass Valve Actuator

910

4197

Figure 6C1-2A-4 Compartment Locations Supercharged Engine

1. Injectors

2. Canister Purge Solenoid

3. R.H. Exhaust Gas Oxygen (O2S) Sensor

4. Transmission Pass-Through Connector

5. Vehicle Speed Sensor (VSS) (Automatic Trans)

6. PCM Connectors

7. Engine Harness Earth

4199

Figure 6C1-2A-5 Component Locations Supercharged Engine

1. Ignition Coils (3 places)

2. Fuel Pressure Regulator

3. Direct Ignition System Module

4. Engine Harness Earth

5. Camshaft Position (CMP) Sensor

6. Oil Pressure Switch

7. R.H. Knock Sensor (KS)

8. Vehicle Speed Sensor (VSS) Automatic Trans)

9. Injectors (3 places)

4201

Figure 6C1-2A-6 Compartment Locations Supercharged Engine

1. Vehicle Speed Sensor

2. Shift Solenoid B (SS) Valve

3. Shift Solenoid A (SS) Valve

4. Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch

5. Shift Solenoid (SS) Valve Assembly

6. Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve

7. Torque Converter Clutch (TCC) Solenoid Valve

8. Pressure Control Solenoid (PCS) Valve

PCM WIRING DIAGRAMS

Figure 6C1-2A-7 V6 PCM Wiring Diagram (1 of 8) Fuse Power Circuits

VXSC054

PCM

BATTERY

LOC . E1

(1040)

(740)

O/B (740) B8

BATTERY

F31

B12

IGNITION

IN JE C TOR VOLTAG E

MONITOR LINE

BLUE

FUSIBLE

LINK

(2H)

15a 15 50

30 ACC

IGN

START

IGNITION SWITCH

P (3) F14

(39)

P/B (39)

EFI REL AY

O/Y

(479)

LOC. E3

(481)

(482)

(439)

P/BLU

(339)

O/BLU

(204)

12V BUS (1040)

(203)

O/B

(208)

B/W

(152)

F34

F35

F33

F32

TO DIS

MODULE

TO A/C

RELAY

TO MAF

SENSOR

TO CANISTER

PURGE SOLENOID

TO BOOST CONTROL

SOLENOID

TO HEATED

OXYGEN SENSORS

TO 3-2

SOLENOID

TO 1-2 SHIFT

SOL ENOID A

TO 2-3 SHIFT

SOL ENOID B

TO TCC ENABLE

SOLENOID

TO TCC PWM

SOLENOID

F28

FUEL PUMP

RELAY

HIGH SPEED

COOLING FAN RELAY

LOW SPEED

COOLING FAN RELAY

DLC

TO REMOTE

RECEIVER

MODULE

TO BODY

CONTROL

MODULE

ENGINE

COOLING

FAN 2

ENGINE

COOLING

FAN 1

YE112

YE110

YE111

YE114

YE39

YE112

YB44

YB188

YE111

Figure 6C1-2A-8 V6 PCM Wiring Diagram (2 of 8) Supercharged Engine Application

YE22

Figure 6C1-2A-9 V6 PCM Wiring Diagram (3 of 8 ) Supercharged Engine Application

VXSC051

BATTERY

LOC . E 1

(1040)

12V BUS (1040)

O (740)O/B (740)

BATTERY

F31

LOC. E15LOC. E5

EARTH

B/R (750)

PCM

A4 IGNITION

R (2H)

15a 15 50

30 OFF/ON

LOCK

ACC

IGN

START

IGNITION SWITCH

P (3)

F14 P/ B (39) P

(39)

(740)

D11

D12

D10

CAM

SENSOR

CONNECTOR

module power supply - in

sensor power supply - out

cam signal - in

3x crank sensor - in

18x crank sensor - in

cam signal - out

tacho signal - out

crankshaft reference - out

18X cranksignal - out

bypass control

EST signal -in

DIS

MODULE

ABCD CBA

W/B (644)

GY/R (645)

B/R (453)

CRANK

SENSOR

CONN

L BLU/W

(646) BR (633)

BLU/Y (643)

BR (121)

TO INSTRUMENT CLUSTER

HEATED OXYGEN

SENSORS

TERMINAL 18 (TACHOMETER)

B (63 0)

V (43 0)

L BLU/B (647)

T/B (4 24)

EFI RELAY

O/Y

(479) LOC. E3

(482)

B/W

(152)

W (423)

CRANKSHAFT

REFERENCE LO

CAMSHAFT

POSITION

SENSOR

SIGNAL

CRANKSHAFT

REFERENCE HI

CRANKSHAFT

18X SIGNAL

BYPASS CONTROL

EST OUTPUT

C11

CT UA L TO RQ UE

O/W (1426)

B/W (14 27)

ENGINE SPEED

12V

REQUESTED

TORQUE (M MR)

ACTUAL

TORQUE (M MI)

ABS/ETC

CONTROL MODULE

DIS

CONTROL MODULE

REQUESTED

TORQUE

BR/R(121)

F35

YB188YE112

YE39

YE114

YE111

YB44

YE34 YE63

YE110

YB98 YE112

YE57

YB194

YB188

YB193

YB44

Figure 6C1-2A-10 V6 PCM Wiring Diagram (4 of 8) Supercharged Engine Application

VXSC052

PCM

CIRCUIT

MASS AIR FLOW SENSOR

CBA

AIR FLOW

FROM

AIR FILTER

AIR FLOW

THROTTLE BODY

EFI

RELAY

P (43 9)

ENGINE EARTH

MASS AIR FLOW

INP U T SIG NAL

EARTH

SENSOR EARTH

ECT SENSOR

SIGNAL

B/R (750)

LOC. E5/E15

BR/W (792)

E16

ENGINE COOLANT

TEMPERATURE SENSOR

Y (41 0)

B/Y (452)

TP SENSOR SIGNAL

TP SENSO R

REFERENCE

VOLTAGE

B11

THROTTLE

POSITION SENSOR

GY (416)

BLU (417)

A/C PRESSURE

SENSOR

F16

SENSOR

EARTH

B7 A/C PRESSURE

SENSOR SIGNAL

5V REFERENCE

VOLTAGE

V/W (415)

B (46 9)

G/B (259)

INTAKE AIR

TEMPERATURE SENSOR

TFT

SENSOR

IAT SENSOR SIGNAL

BR (47 2 )

SNEF

KNOCK SENSOR

SIGNAL

C12

RIGHT

HAND

KNOCK

SENSOR

LEFT

HAND

KNOCK

SENSOR

W/R (815)

OIL PRESSURE

SWITCH

OIL PRESSURE

SWITCH

12V

E12

BLU (31)

F33

VEHICLE SPEED

SENSOR

(832)

(MAN)

(832)

(AUTO)

BLU/W

(831)

(AUTO)

BLU

(831)

(MAN)

YB193

YB188

YB194

YB193

YB194

YB132 (AUTO)

YB195 (MAN)

YE33

YE3YE3

YE23

YE113

YE30

YE106

YE111 YE100

YB194

Figure 6C1-2A-11 V6 PCM Wiring Diagram (5 of 8) Supercharged Engine Application

VXSC055

PCM

CANISTER PURGE

SOLENOID V ALVE

CANISTER PURGE

IGNITION

G/Y (428)

P (39 )

C10

LG/W (443)

IAC VALVE

LG/B (444)

LBLU (441)

LBLU/B (442)

IAC COIL B HI

IAC COIL B LO

IAC COIL A HI

IAC COIL A LO

BATTERY

FS (1040)

FJ R (2H)

F14

LOC. E3

F33

P/B

(39)

15a 15 50

30 OFF/ON

LOCK

ACC

IGN

START

IGNITION SWITCH

(3)

O/Y

(479)

B/W

(152)

LOC. E5/E15

A/C

COMPRESSOR

A/C RELAY

LG/B (366)

G (59)

A/C CLUTCH ENABLE

EFI

RELAY

LOC. E1

P (43 9)

BOOST CONTROL

SOLENOID DRIVE

BOOST

CONTROL

SOLENOID

B/O (429)

YB193YE36

YE120 YE120

YE105

YE101

YE111

YE101

YE115

YE111

YE111YE99

YE39

YE112 YB188

YB44

YB194

YB193

YE105

Figure 6C1-2A-12 V6 PCM Wiring Diagram (6 of 8) Supercharged Engine Application

VXSC057

PCM

A3 SERIAL

DATA

MAIN

LOC. E3

BCM

E2/D2

E9/D3

E3/D13

SERIAL

DATA

MAIN

SERIAL

DATA AUX.

G/W (1220)

W/G (1220)

HIGH SERIES

BCM TERMINALS

NOMINATED FIRST

DATA

LINK

CONNECTOR

12345678

910111213141516

F14

DIAGNOSTIC

ENABLE

W/B (451)

B/Y (155)

B (150)

R/B (1221)

INSTRUMENTS

ABS/ETC

SERIAL

DATA

SERIAL

DATA

CHECK

POWERTRAIN

LAMP

OIL PRESSURE

WARNING LAMP

POWER

EC ONOMY LAMP

12V

SRS

ECC

SERIAL

DATA

SERIAL

DATA

12V IGN

VEHICLE

SPEED

SPEEDOMETER

VEHICLE SPEED

V/W (123)

YE130

YB87

YB190

YB175

YE114

YE111 YB194

YB188

YB193

YE110

YB66

YB128

YE112

YB164

Figure 6C1-2A-13 V6 PCM Wiring Diagram (7 of 8) Supercharged Engine Application

VXSC056

PCM

LOW SPEED FAN

BCM

O/B (473)

BATTERY

LOC.

15a 15 50

30 OFF/ON

LOCK

ACC

IGN

START

IGNITION SWITCH

R (2H)

R (001)

B7/B7

HIGH SERIES

BCM TERMINALS

NOMINATED FIRST

DLC

YB175

YB164

YB174

YB163

YE112

YB188

YB194YB35

YE114

YE110

YB194

YE43

YE103

YB44

YE49

YB44

YE104

YE118

YE119

YB35YE111

MAIN

SERIAL

DATA

START ER ENABLE

SERIAL

DATA

MAIN

E2/D2

(434)

NEUTRAL START

BACK-UP SW.

( MANUAL

TRANS)

START

RELAY

LOC. G1

STARTER

MOTOR

V/W

(6)

87 86

GY/BLU (1434)

R/B (1221)

87A

ENGINE

COOLING

FAN 1

ENGINE

COOLING

FAN RELAY

(LOW SPEED)

ENGINE

COOLING

FAN RELAY

(HIGH SPEED)

BLUE

FUSIBLE

LINK

F31

ENGINE

COOLING

FAN 2

FT FAN 2

FU FAN 1

(1040)

(203)

(001)

O/B

(208)

O/BLU

(204)

BLU/W

(304)

HIGH

SPEED FAN

LOC.

B/P

(157)

Figure 6C1-2A-14 V6 PCM Wiring Diagram (8 of 8) Supercharged Engine Application

VXSC050

PCM

C15

C16

C13

C14

E14

E15

TCC PWM

SOLENOID

3-2 CONTROL

SOLENOID

1-2 SHIFT

SOLENOID

2-3 SHIFT

SOLENOID

PRESSURE

CONTROL

SOLENOID

LOW

PRESSURE CONTROL

SOLENOID HIGH

YB 129 T RANSMIS SION

PASS-THRU CONNECTOR

TORQUE

CONVERTER

CLUTCH (TCC)

(PWM)

SOLENOID

TORQUE

CONVERTER

CLUTCH (TCC)

ENABLE

SOLENOID

3-2 DOWNSHIFT

CONTROL

SOLENOID

1-2 SHIFT

SOLENOID A

2-3 SHIFT

SOLENOID B

PRESSURE

CONTROL

SOLENOID

P/BLU (339)

F10

F11

F16

TFP SIGNAL A

TFP SIGNAL B

TFP SIGNAL C

TRANSMISSION FLUID

TEMPERATURE (TFT)

SENSOR SIGNAL

SENSOR

EARTH

TRANSMISSION FLUID

TEMPERATURE

A/C PRESSURE

SENSOR AND

IAT SENSOR

(TF T ) SENSOR

AUTOMATIC TRANSMISSION FLUID PRESSURE

MANUAL VALVE POSITION SWITCH (TFP)

F12 POWER/ECONOMY

SWITCH

POWER/ECONOMY

SWITCH

TCC ENABLE

SOLENOID

EFI

RELAY

F32

BR (418)

GY/R (422)

G/W (897)

LG (1222)

Y/B (1223)

GY/BLU (1229)

R (1228)

BR/Y (1224)

Y (1225)

GY (1226)

B/Y (1227)

B (46 9)

12V

SWITCH P

SWITCH A

SWITCH B

SWITCH C

LOC. E5/E15 LOC. E3

P R N D L SWITCH

F15

BLU/W (771)

Y (77 2)

GY (773)

W (776)

B/R (750)

RANGE

SIGNAL P

RANGE

SIGNAL A

RANGE

SIGNAL B

RANGE

SIGNAL C

BLU (774)

YB193

YE110

YB194

YB188

YB194

YE112YE30

YB34

YB30

YB20

YE114 YB34

POWERTRAIN CONTROL MODULE CONNECTOR IDENTIFICATION

This powertrain control module voltage Table is for use with a digital voltmeter to further aid in diagnosis.

Connect the Black (-) probe to a good chassis earth, and back probe the powertrain control module terminal with

the Red (+) probe. These voltages were derived from a known good vehicle. The voltages you get may vary

due to low battery charge or other reasons, but they should be very close.

THE FOLLOWING CONDITIONS MUST BE MET BEFORE TESTING:

• Engine and Transmission at operating temperature

• Closed Loop

• Engine idling ( for "Engine Run" column)

• Diagnostic "Test" terminal not earthed

• Tech 2 scan tool not installed

• Accessories "OFF"

BACKPROBING VIEW OF PINK PCM CONNECTOR

Figure 6C1-2A 15 PCM Connector Terminal End View (1 of 3)

Pin Funct i on

CKT

Wire

Colour

Ign

"ON"

Eng

Run

Pin Funct i on

CKT

Wire

Colour

Ign

"ON"

Eng

Run

A1 SYSTEM EARTH 750 B/R * * B1 SYSTEM EARTH 750 B/R * *

A2 SYSTEM EARTH 750 B/R * * B2 SYSTEM EARTH 750 B/R * *

A3 PRIMARY SERIAL

DATA 1221 R/B 3-5 3-5

B3 A/C PRESSURE

SENSOR SIGNAL 259 G/B 1-2 1-2

A4 FUSED IGNITION

FEED 39 P/B 12 13

B4 INTAKE AIR

TEMPERATURE

(IAT) SENSOR

SIGNAL

472 BR 1.0

(3) 1.0

(3)

A5 NOT USED - - - -

B5 ENGINE COOLANT

TEMPERATURE

(ECT) SE NSOR

SIGNAL

410 Y 1.9

(3) 1.9

(3)

A6 FUEL PUMP

RELAY CONT ROL 465 G/W (1) 13

B6 TRANSMISSION

FLUID

TEMPERATURE

(TFT) SENSOR

SIGNAL

1227 B/Y 1.8

(3) 1.8

(3)

A7 TP SENSOR

5 VOLT

REFERENCE

416 GY 5 5

B7 A/C

REFRIGERANT

PRESSURE

SENSOR 5 VOLT

REFERENCE

415 V/W 5 5

A8 BATTERY

VOLTAGE FEED 740 O/B 12 13

B8 BATTERY

VOLTAGE FEED 740 O/B 12 12

A9 NOT USED - - - -

B9 NOT USED - - - -

A10 NOT USED - - -

B10 NOT USED - - - -

A11 NOT USED - - - -

B11 TP SENSOR

SIGNAL 417 BLU (5) (5)

A12 NOT USED - - - -

B12 INJECTOR

VOLTAGE

MONITOR LINE

481 R 12 12

(1) Battery voltage first 2 seconds.

(3) Varies with temperature.

(5) 0.l25 - 1.25 volts measured between terminals "B11" and "B1" or about 4.0 volts at wide open throttle.

(6) Varies with altitude.

* Less than 0.50 volts

Normal

Volta

es Normal

Volta

POWERTRAIN CONTROL MODULE CONNECTOR IDENTIFICATION

This powertrain control module voltage Table is for use with a digital voltmeter to further aid in diagnosis.

Connect the Black (-) probe to a good chassis earth, and back probe the powertrain control module terminal with

the Red (+) probe. These voltages were derived from a known good vehicle. The voltages you get may vary

due to low battery charge or other reasons, but they should be very close.

THE FOLLOWING CONDITIONS MUST BE MET BEFORE TESTING:

• Engine and Transmission at operating temperature

• Closed Loop

• Engine idling ( for "Engine Run" column)

• Diagnostic "Test" terminal not earthed

• Tech 2 scan tool not installed

• Accessories "OFF" BACKPROBING VIEW OF PINK PCM CONNECTOR

Figure 6C1-2A-16 PCM Connector Terminal End View (2 of 3)

Pin Funct i on

CKT

Wire

Colour

Ign

"ON"

Eng

Run

Pin Funct i on

CKT

Wire

Colour

Ign

"ON"

Eng

Run

C1 TCC "ON-OFF"

SOLENOID

CONTROL

422 GY/R 12 13

D1 MASS AIR FLOW

(MAF) SENS OR

INPUT SIGNAL

792 BR/W 4.8 4.2

C2 1-2 SHIFT

SOLENOID

CONTROL

1222 LG 12 *

D2 NOT USED - - - -

C3 2-3 SHIFT

SOLENOID

CONTROL

1223 Y/B 12 *

D3 CAMSHAFT

POSITION (CMP)

SENSOR INPUT

630 B 4.8 4.4

C4 CANISTER PURGE

SOLENOID 428 G/Y 12 13

D4 CRANKSHAFT 18X

SIGNAL 647 LBLU/B 5

2.7

3.0

C5 VEHICLE SPEED

OUTPUT TO

SPEEDOMETER

123 V/W 0.1

0.1

D5 VEHICLE SPEED

SENSOR SIGNAL

LOW

832 T * *

C6 VEHICLE SPEED

SIGNAL HIGH 831 BLU/W * *

D6 NOT USED - - - -

C7 IAC COIL "A" HI GH 441 LBLU NOT USE-

ABLE D7 NOT USED - - - -

C8 IAC COI L "A" LOW 442 LBLU/B NOT USE-

ABLE D8 NOT USED - - - -

C9 IAC COI L " B" LOW 444 LG/B NOT USE-

ABLE D9 BYPASS

CONTROL 424 T/B 0 4.7

C10 IAC COIL "B" HIGH 443 LG/W NOT USE-

ABLE D10 EST OUTPUT 423 W 0 2.0

C11 TORQUE

REQUEST 1426 O/W 4-5 4-5

D11 CRANKSHAFT

REFERE NCE LOW 453 B/R * *

C12 KNOCK SENSOR

(ESC) SIGNAL

INPUT

815 W/R 1.3

D12 CRANKSHAFT

REFERE NCE HIGH 430 V 4.8 2.3

C13 3-2 CONTROL

SOLENOID 897 G/W 12 *

D13 RH OXYGEN

SENSOR SIGNAL 1412 GY 450

mV (4)

C14 3-2 CONTROL

FEEDBACK 897 G/W 12 *

D14 RH OXYGEN

SENSOR EARTH 1413 GY/B * *

C15 TCC PWM

FEEDBACK 418 BR 12 13

D15 LH OXYGEN

SENSOR SIGNAL 412 V 450

mV (4)

C16 TCC

SOLENOID

PWM

CONTROL

418 BR 12 13 D16 LH OXYGEN

SENSOR EARTH 413 VB * *

(4) The voltage should vary between 100 mV - 1000 mV.

* Less than 0.50 volts

Normal

Volta

es Normal

Volta

POWERTRAIN CONTROL MODULE CONNECTOR IDENTIFICATION

This powertrain control module voltage Table is for use with a digital voltmeter to further aid in diagnosis.

Connect the Black (-) probe to a good chassis earth, and back probe the powertrain control module terminal with

the Red (+) probe. These voltages were derived from a known good vehicle. The voltages you get may vary

due to low battery charge or other reasons, but they should be very close.

THE FOLLOWING CONDITIONS MUST BE MET BEFORE TESTING:

• Engine and Transmission at operating temperature

• Closed Loop

• Engine idling ( for "Engine Run" column)

• Diagnostic "Test" terminal not earthed

• Tech 2 scan tool not installed

• Accessories "OFF" BACKPROBING VIEW OF BLUE PCM CONNECTOR

Figure 6C1-2A 17 PCM Connector Terminal End View (3 of 3)

Pin Funct i on

CKT

Wire

Colour

Ign

"ON"

Eng

Run

Pin Funct i on

CKT

Wire

Colour

Ign

"ON"

Eng

Run

E1 BOOST CONTROL

SOLENOID 429 B/O 12 13 F1 FUEL INJECTOR #

4 CONTROL 844 BR/Y 12 13

E2 FUEL INJECTOR #

3 CONTROL 843 V 12 13 F2 FUEL INJECTOR #

1 CONTROL 841 BLU 12 12

E3 FUEL INJECTOR #

2 CONTROL 842 G 12 13 F3 FUEL INJECTOR #

6 CONTROL 846 Y 12 13

E4 FUEL INJECTOR #

5 CONTROL 845 GY 12 13 F4 AIR

CONDITIONING

RELAY CONT ROL

366 LG/B 12 (2)

E5 FUEL PUMP

CONTROL

MOLDULE (PWM)

DRIVER

411 LT BLU * 3.0

3.4 v

F5 START RELAY

CONTROL 1434 GY/BLU * *

E6 PRNDLE "A" 771 BLU/W * * F6 ENGINE COOLING

FAN RELA Y HIGH

SPEED CONTROL

304 BLU/W 12 (7)

E7 PRNDL "B" 772 Y 12 13 F7 TORQUE

ACHIEVED 1427 B/W .9 3-6

E8 PRNDL " C" 773 GY 12 13 F8 NOT USED - - - -

E9 NOT USED - - - - F9 RANGE SIGNAL

"A" 1224 BR/Y 12 13

E10 NOT USED - - - - F10 RANGE SIGNAL

"B" 1225 Y 0 0

E11 NOT USED - - - - F11 RANGE SIGNAL

"C" 1226 GY 12 13

E12 OIL PRESSURE

INPUT SIGNAL 31 BLU * 13 F12

POWER/ECONOMY

SWITCH INPUT 774 BLU (6) (6)

E13 NOT USED - - - - F13 NOT USED - - - -

E14 PRESSURE

CONTROL

SOLENOID LOW

1229 GY/BLU * 6.8 F14 DIAGNOSTIC

TEST ENABLE 451 W/B 5 5

E15 PRESSURE

CONTROL

SOLENOID HIGH

1228 R * 1.3 F15 PRNDL "P" 776 W * *

E16 ECT/TP

SENSOR

EARTH

452 B/Y * * F16 IAT, TFT, A/C

REFRIGERANT

PRESSURE

SENSOR

EARTH

469 B * *

(2) With air conditioning "ON" 0 volts, with air conditioning "OFF" 13 volts.

(3) 12 volts while engine is cranking.

(6) When Power/Economy switch is depresses, voltage will momentarily change from 12 volts to 0 volts

then back to 12V.

(7) With engine cooling fan "ON" 0 volts, with engine cooling fan "OFF" 13 volts.

* Less than 0.50 volts.

Normal

Volta

es Normal

Volta

PCM CONNECTOR TERMINAL VOLTAGES WITH EXPLANATIONS

A1 - SYSTEM EARTH

A2 - SYSTEM EARTH

These terminals should have zero volts. They are connected directly to the engine earth.

A3 - PRIMARY SERIAL DATA

This is a dedic ated line for the T ech 2 sc an tool comm unication. T he circuit c onnects the PCM, ABS, and BCM.

The T ech 2 sc an tool can "talk" to each of these m odules by sending a mess age to a controller and ask ing only

it to respond. The communication rate is at 8192 baud. The normal voltage on this circuit is about 5 volts, but

when the Tech 2 scan tool is com municating with a controller, the voltage will vary and if read with a DVM may

read about 2.5 volts

A4 - IGNITION SWITCH INPUT SIGNAL

This is the "turn on" signal to the PCM from the ignition switch circuit. It is not the "power supply" to the PCM, it

only tells the PCM that the ignition switch is "ON." T he voltage should equal the battery voltage when the k ey is

in either the `run' or `crank' position.

A5 - NOT USED

A6 - FUEL PUMP (FP) RELAY CONTROL

Turning the ignition "ON" causes the PCM to energise (+12V) the Fuel Pump Relay. If no crankshaft reference

input pulses are received, the PCM turns "OFF" the relay. As soon as the PCM receives crankshaft reference

input pulses, the PCM will turn the Fuel Pump Relay on again.

A7 - THROTTLE POSITION (TP) SENSOR

REFERENCE VOLTAGE

This voltage should always be 5 volts anytim e the ignition is "ON." It is a regulated voltage output f rom the PCM,

and supplies 5 volts to the TP sensor.

A8 - BATTERY VOLTAGE FEED

- HOT AT ALL TIMES -

This supplies the PCM with full-time +12 volts. It stays hot even when the ignition is turned off. It receives its

voltage through the "ENGINE" fuse F31. This PCM terminal could be called the power supply and "MEMORY"

terminal.

A9 - NOT USED

A10 - NOT USED

A11 - NOT USED

A12 - NOT USED

B1 - SYSTEM EARTH

B2 - SYSTEM EARTH

These terminals should have zero volts. They are connected directly to the engine earth.

B3 - A/C REFRIGERANT PRESSURE SENSOR INPUT

SIGNAL

The signal that is sent from the pressure Sensor to the PCM indicates to the PCM what the A/C pressure is at.

Depending on the A/C pressure, this signal will indicate to the PCM if A/C pressure is to low or to high.

B4 - INTAKE AIR TEMPERATURE (IAT) INPUT SIGNAL

The PCM sends a 5 volt signal voltage to the IAT sensor, which is a temperature - variable-resistor called a

thermistor. The sensor is also connected to earth, and will alter the signal voltage according to incoming air

temper ature. As the air tem perature inc reases, the voltage s een on this term inal dec reases . At 0 degrees C, the

voltage will be above 4 volts. At normal operating temperature (10 degrees C to 80 degrees C) the voltage will

be less than 4 volts.

B5 - ENGINE COOLANT TEMPERATURE (ECT)INPUT SIGNAL

The PCM sends a 5 volt signal voltage out to the engine coolant temperature sensor, which is a temperature-

variable-resistor called therm istor. The sensor, being also connected to earth, will alter the voltage according to

engine coolant temperature. As the engine coolant temperature increases, the voltage seen on terminal B5

decreases. At 0 degrees C engine coolant temperature the voltage will be above 4 volts. At normal operating

temperature (85 degrees C to 100 degrees C) the voltage will be less than 2 volts.

B6 - TRANSMISSION FLUID TEMPERATURE (TFT) INPUT SIGNAL

- AUTO TRANS ONLY

The PCM s ends a 5 volt signal voltage out to the trans m ission f luid tem perature s ensor, which is a temperatur e-

variable-resistor called therm istor. The sensor, being also connected to earth, will alter the voltage according to

transmission fluid temperature. As the fluid temperature increases, the voltage seen on terminal B6 will

decrease.

B7 - A/C PRESSURE SENSOR REFERENCE VOLTAGE

This voltage should always be 5 volts anytim e the ignition is "ON." It is a regulated voltage output f rom the PCM,

and supplies 5 volts to the A/C Pressure Sensor.

B8 - BATTERY VOLTAGE FEED

- HOT AT ALL TIMES -

This supplies the PCM with full-time +12 volts. It stays hot even when the ignition is turned off. It receives its

voltage through the "ENGINE" fuse F31. This PCM terminal could be called the power supply and "MEMORY"

terminal.

B9 - NOT USED

B10 - NOT USED

B11 - THROTTLE POSITION (TP) SENSOR

The TP sensor input voltage, which follows actual throttle changes, is variable from 0 to 5 volts. Typically the

voltage is less than 1 volt at idle, and 4 to 5 volts at wide-open throttle.

B12 - INJECTOR CIRCUIT VOLTAGE MONITOR INPUT SIGNAL

The injector voltage monitor line is used so that the PCM will know the exact voltage the fuel injectors are

operating at. This voltage signal is used to modify the fuel injector pulse width calculation.

C1 - TORQUE CONVERTER CLUTCH ENABLE SOLENOID CONTROL

- AUTO TRANS ONLY

The PCM is used to either open or provide a path to earth for the torque converter solenoid. When the PCM

provides a path to earth, the T CC solenoid is cons idered ON and voltage s hould be near 0 volts. T he PCM uses

both the TCC enable solenoid and the TCC "PWM" solenoid to control the torque converter clutch. (See TCC

PWM solenoid terminal E1)

C2 - 1 - 2 SHIFT SOLENOID CONTROL

- AUTO TRANS ONLY -

The PCM is used to either open or pr ovide a path to earth for the 1-2 shif t solenoid. W hen the PCM provides a

path to earth, the 1-2 shift solenoid is considered "ON" and the voltage should read 0 volts.

C3 - 2 - 3 SHIFT SOLENOID CONTROL

- AUTO TRANS ONLY

The PCM is used to either open or pr ovide a path to earth for the 2-3 shif t solenoid. W hen the PCM provides a

path to earth, the 2-3 shift solenoid is considered "ON" and the voltage should read 0 volts.

C4 - CANISTER PURGE SOLENOID CONTROL

The PCM operates a norm ally closed solenoid valve, which contr ols vacuum to pur ge the evaporative emis sions

storage canister of stored gasoline vapours. The PCM turns "ON" the pulse width modulated control of the

purge solenoid, to control purging of the stored vapours. If the PCM is not energising the purge solenoid, the

voltage measured at this terminal should equal battery voltage. If the PCM is controlling the solenoid, the

measured voltage will be between battery voltage and 0.50 volts.

C5 - VEHICLE SPEED OUTPUT TO SPEEDOMETER

The PCM alternately earths this s ignal, in pulses, when it rec eives a vehicle speed signal f rom the vehicle speed

sensor in the transmission. This pulsing action takes place about 6250 times per kilometer. The speedometer

calculates vehicle speed based on the time between pulses.

C6 - VEHICLE SPEED SENSOR - OUTPUT SHAFT SPEED INPUT SIGNAL HIGH

The transmission has an output shaft speed sensor used by the PCM to calculate vehicle speed, and to help

determ ine various autom atic trans mission shifting f unctions. It is a m agnetic inductive sens or that generates an

AC voltage signal sent to the PCM. If measured with the digital AC voltmeter, no voltage will appear until the

output shaft begins turning.

C7 - IDLE AIR CONTROL (IAC)

C8 - IDLE AIR CONTROL (IAC)

C9 - IDLE AIR CONTROL (IAC)

C10 - IDLE AIR CONTROL (IAC)

These terminals connect the Idle Air Control valve, located on the throttle body, to the PCM. It is difficult to

predict what the voltage will be, and the measurement is unusable for any service procedures.

C11 - TRACTION CONTROL (TORQUE REQUESTED)

The ABS/ET C m odule will send a N.m signal to the PCM when torque reduction is requested fr om the ABS/ETC

module for traction control. This N.m signal should match closely with Torque Achieved N.m signal, when

traction control is being requested.

C12 - ELECTRONIC SPARK CONTROL (ESC) "KNOCK" INPUT SIGNAL

The Electronic Spark Control "k nock " sensor detects when detonation is occurr ing in the combus tion cham bers.

W hen detected, the PCM will reduce the am ount of spark advance being delivered on the EST output circuit to

the ignition module.

C13 - 3 - 2 DOWNSHIFT CONTROL SOLENOID

CONTROL

- AUTO TRANS ONLY -

The 3-2 c ontrol solenoid is a nor mally closed, pulse width m odulated solenoid used to control the 3-2 downshift.

The PCM operates the 3-2 control solenoid at

a frequency of 50 Hz (cycles per second). The solenoid is constantly fed 12 volts and PCM controls the length

of time the path to earth for the electrical circuit is closed.

C14 - 3 - 2 SHIFT SOLENOID FEEDBACK

- AUTO TRANS ONLY -

The 3-2 Shif t solenoid is a norm ally closed solenoid used to control the 3-2 downshift. The solenoid is constantly

fed 12 volts and PCM controls the length of time the path to earth for the electrical circuit is closed. The PCM

does this to provide a smooth 3-2 downshift. If the PCM senses an incorrect voltage on this circuit when

controlling the 3-2 downshift solenoid (i.e. - O volts with the solenoid OFF, or 12 volts with the solenoid ON) a

DTC code 66 will set.

C15 - TORQUE CONVERTER CLUTCH - PULSE WIDTH MODULATED APPLY SOLENOID FEEDBACK

- AUTO TRANS ONLY -

The PCM uses the pulse width modulated T CC apply solenoid to sm oothly engage the torque converter clutch,

after the TCC "ON-OFF" solenoid is energised. By varying the duty cycle pulse width modulation, the PCM can

slowly engage the torque converter clutch, allowing very smooth TCC engagement. If the PCM senses an

incorrec t voltage on this c ircuit when c ontrolling the T CC PW M s olenoid (i.e. - O volts with the solenoid OF F, or

12 volts with the solenoid ON ) a DTC code 83 will set.

C16 - TORQUE CONVERTER CLUTCH - PULSE WIDTH MODULATED APPLY SOLENOID CONTROL

- AUTO TRANS ONLY -

The PCM uses the pulse width modulated TCC apply solenoid to smoothly engage the torque converter clutch,

after the TCC "ON-OFF" solenoid is energised. By varying the duty cycle pulse width modulation, the PCM can

slowly engage the torque converter clutch, allowing very smooth TCC engagement.

D1 - MASS AIR FLOW (MAF) INPUT SIGNAL

The PCM supplies a 5-volt signal voltage to the mass air flow sensor on this circuit. The mass air flow sensor

pulses the 5-volt signal to earth. These earth pulses occur at a very fast rate - from less than 500 per second

(500 Hz) with no airflow through the sensor, to upwards of many thousands of pulses per second at high air flow

rates such as during acceleration. If measured, the voltage seen will be between 0.5 and 4.5 volts, depending

on air flow through the sensor.

D2 - NOT USED

D3 - CAMSHAFT POSITION INPUT SIGNAL

This signal is used by the PCM to "sequence" the energising of the fuel injector s, similar to the firing order of an

engine. This allows the PCM to operate the fuel injectors in a "sequential fuel injection" mode. The camshaft

position sensor is actually wired to the ignition module. The ignition module sends one pulse per every two

crankshaft revolutions to the PCM to determine actual camshaft position, and thus, engine cycle sequence.

D4 - CRANKSHAFT 18X INPUT SIGNAL

The 18X crankshaft reference input signal is used to very accurately control EST spark timing at low engine

speeds - below 1200 RPM. Below 1200 RPM, the PCM monitors the 18X signal to control spark timing. At

engine speeds above 1200 RPM, the PCM uses the 3X c rankshaf t r ef er ence input s ignal to c ontrol s park timing.

(See 3X crankshaft reference terminal D12)

D5 - VEHICLE SPEED SENSOR - OUTPUT SHAFT SPEED INPUT SIGNA L LOW

The transmission has an output shaft speed sensor used by the PCM to calculate vehicle speed, and to help

determ ine various autom atic trans mission shifting f unctions. It is a m agnetic inductive sens or that generates an

AC voltage signal sent to the PCM. If measured with the digital AC voltmeter, no voltage will appear until the

output shaft begins turning.

D6 - NOT USED

D7 - NOT USED

D8 - NOT USED

D9 - IGNITION MODULE BYPASS CONTROL

- IGNITION SYSTEM MODE CONTROL -

With ignition "ON" and engine not running this terminal will have very low voltage. As soon as the PCM sees

engine RPM of m ore than 1600 RPM (Electronic Spark Timing "run" threshold) the PCM turns on 5 volts to the

Ignition Module Bypass Control circuit, causing the ignition module to allow the PCM to operate the ignition

system.

D10 - ELECTRONIC SPARK TIMING (EST) OUTPUT

This terminal will have very low voltage with the ignition "O N" but engine not running. W ith the engine r unning at

idle, the voltage should be slightly more than 1 volt. As the engine RPM goes up, this voltage will increases.

D11 - CRANKSHAFT REFERENCE INPUT SIGNAL LOW

This terminal should always be zero volts. It is connected through the ignition module to engine earth.

D12 - 3X CRANKSHAFT REFERENCE INPUT SIGNAL HIGH

This terminal could be called the "tach" input. It provides the PCM with RPM and crankshaft position

information. With ignition "ON" but engine not running, the voltage will be either high or low, depending on

crank shaft position. As the crankshaft turns, the voltage will be an average of the two readings. The PCM uses

the 3X signal to control fuel injection, and spark timing with engine speeds above 1200 RPM. (See 18X

crankshaft reference terminal D4)

D13 - OXYGEN SENSOR INPUT SIGNAL

- RIGHT BANK -

W ith ignition "ON" and engine not running, the voltage should be 350 - 450 millivolts (0.350 - 0.450 volts). This

is the PCM-supplied 02 c ircuit "bias" voltage. With the engine running and after the 02 s ensor is hot, the voltage

should be rapidly changing, somewhere between 10 - 1000 millivolts (0.010 - 1.000 volt).

D14 - OXYGEN SENSOR EARTH

- RIGHT BANK -

This terminal should have zero volts. It is connected directly to the engine earth. This terminal earths the PCM

circuitry for the O2 voltage monitor inside the PCM.

D15 - OXYGEN SENSOR INPUT SIGNAL

- LEFT BANK -

W ith ignition "ON" and engine not running, the voltage should be 350 - 450 millivolts (0.350 - 0.450 volts). This

is the PCM-supplied 02 c ircuit "bias" voltage. With the engine running and after the 02 s ensor is hot, the voltage

should be rapidly changing, somewhere between 10 - 1000 millivolts (0.010 - 1.000 volt).

D16 - OXYGEN SENSOR EARTH

- LEFT BANK -

This terminal should have zero volts. It is connected directly to the engine earth. This terminal earths the PCM

circuitry for the O2 voltage monitor inside the PCM.

E1 - BOOST CONTROL SOLENOID

The PCM oper ates a norm ally closed solenoid valve, which contr ols vac uum to the By-Pass Valve Actuator. The

PCM turns "ON" the solenoid , to allow vacuum to the By-Pass Valve Actuator, to close the By-Pass valve and

allow full boost. If the PCM is not energising the boost solenoid, the voltage measured at this terminal should

equal battery voltage. If the PCM is controlling the solenoid, the measured voltage will be between battery

voltage and 0.50 volts.

E2 - FUEL INJECTOR 3 - CONTROL

E3 - FUEL INJECTOR 2 - CONTROL

E4 - FUEL INJECTOR 5 - CONTROL

The voltage seen at these terminals actually comes through the injectors, which are connected to +12 volts.

With the engine not running, the voltage seen would be battery voltage. With the engine running at idle, the

charging system increases the voltage slightly, so this voltage will increase. With higher engine RPM or more

engine load, the resulting increase in injector pulse frequency or injector pulse width will cause this voltage to

appear slightly less.

E5 - FUEL PUMP CONTROL MODULE

A duty cycle earth signal on this circuit varies depending on engine load. Under normal driving conditions, the

duty cycle earth signal supplied from the PCM to the Fuel Pump Control Module (terminal 7 of the Fuel Pump

Control Module) is at 33% duty cycle. This 33% duty cycle runs the Fuel Pump at a lower fuel flow rate. When

the vehicle is in a heavy engine load condition, the PCM will switch from 33% duty cycle to 100% duty cycle.

This will cause the Fuel Pump to operate at a high fuel flow rate to compensate for the higher engine load

condition. T his change in duty cycles does not change the f uel sys tem operating fuel pressur e, but changes the

fuel flow rate.

E6 - PRNDL A

E7 - PRNDL B

E8 - PRNDL C

These circuits along with PCM circuit F15 indicate to the PCM what transmission gear the driver has selected.

The PCM will then send a command via the serial data line to the instrument panel cluster (smart cluster) to

indicate to the driver what gear has been selected.

E9 - EGR IGNITION

This is a ignition voltage input that runs between the EGR valve and the PCM. The PCM uses this input to

determine actual voltage supplied to the EGR valve.

E10 - NOT USED

E11 - NOT USED

E12 - OIL PRESSURE SWITCH

This is a earth input to the PCM from the Oil Pressure Switch indicating proper oil pressure when the engine is

running. If oil pressure is lost while the engine is running, the oil switch will open its contacts and the earth

signal to the PCM will be rem oved. When the PCM sees this los s of ear th signal, the PCM will comm and the oil

lamp ON.

E13 - NOT USED

E14 - TRANSMISSION PRESSURE CONTROL

SOLENOID (PCS) - LOW

- AUTO TRANS ONLY -

The 4L60-E automatic transmission uses an electrical solenoid to control hydraulic pressure inside the

transmission. This electrical solenoid allows the PCM to control "line pressure", similar to other automatic

transm issions that use a "throttle valve" cable or vacuum modulator. T he duty cycle, and am ount of cur rent flow

to the PCS, are both controlled by the PCM. By m onitoring this line, the PCM can determine if the comm anded

amperage has gone to the PCS and returned to the PCM.

E15 - TRANSMISSION FLUID PRESSURE CONTROL

SOLENOID (TFP) - HIGH

- AUTO TRANS ONLY -

The duty cycle, and am ount of current f low to the TFP, are controlled by the PCM. T his circuit is the B+ supply

line from the PCM to the TFP. The duty cycle and amperage are controlled by the PCM.

E16 - ENGINE COOLANT TEMPERATURE and THROTTLE POSITION SENSOR EARTH

This terminal should be zero volts. It is connected through the PCM circuitry to engine earth.

F1 - FUEL INJECTOR 4 - CONTROL

F2 - FUEL INJECTOR 1 - CONTROL

F3 - FUEL INJECTOR 6 - CONTROL

The voltage seen at these terminals actually comes through the injectors, which are connected to +12 volts.

With the engine not running, the voltage seen would be battery voltage. With the engine running at idle, the

charging system increases the voltage slightly, so this voltage will increase. With higher engine RPM or more

engine load, the resulting increase in injector pulse frequency or injector pulse width will cause this voltage to

appear slightly less.

F4 -AIR CONDITIONING RELAY CONTROL

W hen the A/C is r equested, the BCM will comm unicate to the PCM via the serial data line, requesting A/C. T he

PCM supplies the earth path on this terminal to energise the A/C control relay. The voltage will be less than 1

volt when the PCM energises the relay. W hen the PCM does energise the A/C control relay, the voltage will be

more than 0.1, but less than 1 volt.

F5 - START RELAY CONTROL

When the PCM receives the proper Theft Deterrent signal, the PCM will supply a earth signal to Start Relay.

This will allow the vehicle to star t. If a impr oper Theft Deter rent signal is sensed by the PCM, then the PCM will

not supply a earth signal to the Start Relay. This will prevent the starter motor from operating.

F6 - ENGINE COOLING FAN - HIGH SPEED RELAY CONTROL

This terminal will have battery voltage until the PCM energises the high s peed cooling fan relay by supplying the

earth; then it will be close to zero. The input that causes the PCM to energise the high speed fan relay is the

engine coolant tem perature s ensor. T he PCM will also energis e the high speed f an relay in the Diagnos tic Mode

- i.e., ignition "ON," engine stopped, and DLC

diagnostic "test" enable terminal earthed. Refer engine fan TABLE A-12 in this Section for further explanation.

(The Body Control Module operates the cooling fan low speed relay)

F7 - TRACTION CONTROL (TORQUE ACHIEVED)

The PCM sends a N.m signal to the ABS/ETC module on the delivered torque circuit informing the ABS/ETC

module of response made to the desired torque N.m signal. This N.m signal should match closely with the

Requested Torque N.m signal. A problem with the

delivered torque circuit should cause a ABS/ETC DTC to set, and traction control to be disabled.

F8 - CRANKING SIGNAL INPUT

This cranking signal circuit provides an input for enabling fuel cutoff during a possible back fire situation. During

an engine start, when the k ey switch is released fr om the crank position before the engine is running, the engine

may backfire. The PCM stops all injector pulses when the engine speed is less than 450 RPM, coolant

temper ature is gr eater than -4 degr ees C, a cr anking s ignal is not received, but was received within the previous

12.5 milliseconds

F9 - RANGE SIGNAL A INPUT SIGNAL

F10 - RANGE SIGNAL B INPUT SIGNAL

F11 - RANGE SIGNAL C INPUT SIGNAL

- AUTO TRANS ONLY -

Range signal "A", "B" and "C". The PCM sends out a buffered 12 volt signal to the pressure switch assembly,

located in the automatic transmission valve body. The 12 volt signal must pass through either a normally open

or norm ally closed s witc h to reach earth. W hen the switches ) are closed, the signal should be near 0 volts. The

PCM monitors the status of these signals to determine which gear servo is actually receiving hydraulic apply

pressure.

F12 -POWER / ECONOMY INPUT SIGNAL

- AUTO TRANS ONLY -

The PCM s ends a signal of about 12 volts, and monitors the status of this circuit. In the ECON OMY pos ition the

switch is open, the PCM voltage status signal remains high – about 12 volts, and the PCM does not allow shift

point changes. When the transmission switch is pressed to the POWER position the switch is momentarily

closed and the PCM voltage status signal is momentarily pulled low. The PCM senses the momentary voltage

signal drop and enables power m ode shif ting only if other criteria are met. Thes e criteria include throttle position

and engine speed.

F13 - NOT USED

F14 - DIAGNOSTIC TEST ENABLE INPUT SIGNAL

This terminal is connected to the DLC diagnostic test enable terminal. W hen the diagnostic test term inal is not

earthed, this terminal will have 5 volts on it. When the DLC diagnostic test enable terminal is earthed, the

resulting zero voltage at the PCM will cause it to operate in Diagnostic Mode.

F15 - PRNDL P

This circuit along with PCM circuits E6, E7, E8 indicate to the PCM what transmission gear the driver has

selected. The PCM will then send a command via the serial data line to the instrument panel cluster (smart

cluster) to indicate to the driver what gear has been selected.

F16 - INTAKE AIR TEMPERATURE / TRANSMISSION FLUID TEMPERATURE / A/C PRESSURE SENSOR

EARTH CIRCUIT

This terminal should be zero volts. It is connected through the PCM circuitry to engine earth.

PCM V6 SUPERCHARGE ENGINE AND TRANSMISSION DIAGNOSTIC

TROUBLE CODES (DTC)

DTC

DESCRIPTION ILLUMINATE

"CHECK

POWERTRAIN"

LAMP

12 No revolutions per minute signal - normal when engine is not running No

13 Right Hand Oxygen Sensor (HO2S) Insufficient Activity Yes

14 Engine Coolant Temperature ECT - Signal Voltage Low Yes

15 Engine Coolant Temperature ECT - Signal Voltage High Yes

16 Engine Coolant Temperature ECT – Sensor Unstable No

17 PCM Error - ECT Circuit No

19 Throttle Position (TP) Sensor Circuit Insufficient Activity Yes

21 Throttle Position (TP) Sensor Circuit High Voltage Yes

22 Throttle Position (TP) Sensor Circuit Low Voltage Yes

23 Intake Air Temperature (IAT) Sensor Circuit High Voltage No

24 Vehicle Speed Sensor (VSS) Circuit Low Voltage Yes

25 Intake Air Temperature (IAT) Sensor Circuit Low Voltage No

26 Intake Air Temperature (IAT) Sensor Unstable No

28 Transmission Fluid Pressure (TFP) Valve Position Switch Circuit Yes

31 Theft Deterrent Signal Missing Yes

32 Mass Air Flow (MAF) Out Of Range Yes

35 Idle Speed Low No

36 Idle Speed High No

41 Ignition Electronic Spark Timing (EST) Output Circuit Fault Yes

42 Ignition Bypass Circuit Fault Yes

43 Knock Sensor Circuit Fault No

44 Right Hand Heated Oxygen Sensor (HO2S) Low Voltage Yes

45 Right Hand Heated Oxygen Sensor (HO2S) High Voltage Yes

46 No Reference Pulses While Cranking Yes

47 18X Reference Signal Missing No

48 Camshaft Position Sensor Circuit Low Voltage No

49 Camshaft Position Sensor Circuit Performance No

51 PROM Error Yes

52 System Voltage Too High (Long Time) Yes

53 System Voltage Too High Yes

54 System Voltage Unstable Yes

55 PCM - Analog - Digital (A/D) Conversion Error Yes

56 Lean Condition Under Load (Supercharged Engine Only) Yes

57 Injector Voltage Monitor Fault No

58 Transmission Fluid Temperature (TFT) Sensor Circuit - Low Input No

59 Transmission Fluid Temperature (TFT) Sensor Circuit - High Input No

63 Left Hand Oxygen Sensor (HO2S) Insufficient Activity Yes

64 Left Hand Heated Oxygen Sensor (HO2S) Low Voltage Yes

65 Left Hand Heated Oxygen Sensor (HO2S) High Voltage Yes

66 3-2 Shift Solenoid Circuit Electrical Yes

67 Torque Converter Clutch (TCC) Enable Solenoid Circuit Electrical Yes

69 Torque Converter Clutch (TCC) System Stuck On No

72 Transmission Output Speed Loss No

73 Pressure Control (PC) Solenoid Circuit Electrical No

75 System Voltage Low Yes

76 Short Term Fuel Trim (STFT) Delta High No

78 Long Term Fuel Trim (LTFT) Delta High No

79 Transmission Fluid Overtemperature Yes

81 2-3 Shift Solenoid Circuit - Fault Yes

82 1-2 Shift Solenoid Circuit - Fault Yes

83 Torque Converter Clutch Pulse Width Modulation Solenoid Circuit - Fault No

PCM V6 SUPERCHARGE ENGINE AND TRANSMISSION DIAGNOSTIC TROUBLE CODES (DTC)

(CONTINUED)

DTC

DESCRIPTION ILLUMINATE

"CHECK

POWERTRAIN"

LAMP

85 Transmission Slipping No

91 QDSM (Quad Driver Surface Module) Circuit No

92 Low Speed Fan No BCM Response No

93 SNEF Circuit Fault No

94 No Vehicle Speed Sensor - Manual Transmission Yes

95 Requested Torque Out Of Range Yes

96 A/C Pressure Sensor Fault No

97 Canister Purge Circuit Fault No

4L60 E TRANSMISSION FLUID CHECKING PROCEDURE

GENERAL INFORMATION

W hen adding or changing the tr ansmiss ion fluid, use only Dexr on III. Ref er to the Series Owner's Handbook for

the recommended servicing intervals.

Because this transmission fluid changes colour and smell very easily in its life, these indicators should not

necessarily be relied upon to diagnose either transmission internal condition or fluid deterioration.

The Fluid Checking Procedure shows that a dark brown fluid colour, coupled with a delayed shift pattern, may

only indic ate that the fluid requires replacem ent and alone, is not a definite indic ation of a potential transm ission

failure.

NOTE: Do not overfill the transmission. Overfilling will cause foaming of the fluid, loss of fluid, shift complaints

and possible damage to the transmission.

TRANSMISSION FLUID COLOUR

Trans mission f luid colour when new and unused, is red. A red dye is added so that it can be distinguished from

other oils and lubricants. The red dye is not an indicator of fluid quality and is not permanent. As the vehicle is

driven, the transm ission fluid will quickly begin to look darker in colour. The colour will then appear light brown.

A DARK brown colour with a distinctively burnt odour MAY indicate fluid deterior ation and a need for the fluid to

be changed.

TRANSMISSION FLUID CHECKING PROCEDURE

1. Start the engine and drive vehicle for a maximum of 24 km, or until the transmission normal operating

temperature is reached.

NOTE: As tem peratur e greatly affects transm is sion fluid levels , this operation m ust only be carr ied out when

the transmission is at normal operating temperature (82 - 94 degrees C). If the vehicle is not at normal

operating temperature, and the proper checking procedures are not followed, the result could be a false

reading of the fluid level on the dipstick.

2. Park vehicle on level earth.

3. Move gear selector to 'PARK' position.

4. Apply park brake.

5. Let engine idle for 3 minutes with accessories turned off.

6. Locate r ed coloured dips tick in the engine com partment, lif t the lock ing lever, rem ove the dipstick and check

fluid colour, condition and level.

7. If the fluid level is low, add only enough DEXRONâ III to bring the level into the "HOT" area.

Inaccurate fluid level readings will result if checked immediately after the vehicle has been operated under

any or all of the following conditions:

a. In high ambient temperatures above 32 degrees C.

b. At sustained high speeds.

c. In heavy city traffic during hot weather.

d. Towing

e. In commercial use (e.g. taxi).

If the vehicle has been operated under these conditions, switch the engine off and allow the vehicle to 'cool' for

approximately thirty minutes. After cool-down period, re-start the vehicle and continue from step 2.

4L60-E AUTOMATIC TRANSMISSION FLUID CHECKING PROCEDURE

STEP ACTION VALUE YES NO

1. Check the fluid colour.

Is the fluid colour red? Go to Step 2 Go to Step 11

2. Is the fluid level satisfactory? Go to Step 20 Go to Step 3

3. Check the fluid.

Is the fluid foamy? Go to Step 8 Go to Step 4

4. Check the fluid level. The proper fluid level should be In

the middle of the X-hatch.

Is the level high?

Go to Step 9 Go to Step 5

5. Fluid will be low.

Add fluid to the proper fluid level.

Is the fluid level satisfactory?

Go to Step 6 Go to Step 1

6. Check for external leaks.

Were any leaks present? Go to Step 7 Go to Step 20

7. Correct the fluid leak condition.

Is action complete? Go to Step 20

8. Is the fluid level too high? Go to Step 9 Go to Step 10

9. Remove excess fluid to adjust to the proper fluid level.

Is action complete? Go to Step 20

10. 1. Check for contaminants in the fluid.

2. Drain the fluid to determine the source of the

contamination.

Is action complete?

Go to Step 15

11. Is the fluid colour non-transparent pink? Go to Step 12 Go to Step 13

12. Replace the cooler.

Is action complete? Go to Step 15

13. The fluid colour should be light brown. Transmission fluid

may turn dark with normal use. This does not always

indicate oxidation or contamination.

Is the fluid colour light brown?

Go to Step 14 Go to Step 1

14. Drain the fluid to determine if the fluid is contaminated.

A very small amount of material in the bottom of the pan

is a normal condition, but large pieces of metal or other

material in the bottom of the pan requires a transmission

overhaul.

Was the fluid contaminated?

Go to Step 15 Go to Step 18

15. Overhaul the transmission. Refer to Section 7C5, unit

repair in VX Service Information.

Is action complete?

Go to Step 16

16. Flush the cooler.

Is action complete? Go to Step 17

17. Add new fluid.

Is action complete? Go to Step 19

18. Change the fluid and filter.

Is action complete? Go to Step 19

19. Is the fluid level satisfactory, If not, correct as necessary.

Is action complete? Go to Step 20

20. Refer to 4L60-E Transmission Functional Test Procedure,

in Section 7C3, Diagnosis, in VX Service Information.

Is action complete?

Fluid Checking

Procedure

Completed

TABLE A V6 PCM -

ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK

CIRCUIT DESCRIPTION:

The On-Board Diagnostic System Check is an organised approach in identifying a problem created by a

powertrain control system malfunction. It must be the starting point for any driveability complaint diagnosis,

because it directs the service technician to the next logic al step in diagnosing the com plaint. Understanding the

Table and using it correctly will reduce diagnostic time and prevent the unnecessary replacement of good parts.

TEST DESCRIPTION: Number(s) below refer to step number(s) on the diagnostic Table.

1. This s tep is a chec k for the pr oper oper ation of the "Chec k Powertrain" lamp (MIL). The PCM should provide

serial data communication path for the "Check Powertrain" lamp, this is a bulb check. The "Check

Powertrain" lam p should be "ON." If it can do this, it conf irm s that the PCM has power, earth and is capable

of some functions.

If the "Check Powertrain" lamp is "OFF," this indicates a problem in the "Check Powertrain" lamp fuse

circuits or the PCM earth circuits or the PCM's serial data communication circuit or a problem with the

instrument cluster. Table A-1 will check for both ignition feed and constant battery power to the PCM and

the PCM earth.

2. This check is done to see if the PCM has the capability of performing internal diagnostics. With the

diagnostic "test" terminal earthed, the "Check Powertrain" lamp, should flash a DTC 12 or flash any other

DTC(s ) stor ed in memory. DTC 12 means ther e is no c rankshaf t r ef er ence s ignal coming to the PCM, this is

normal because the engine is not running.

3. This c heck is us ed to s ee if the PCM c an supply serial data f or Tech 2 s can tool us e. If an EEPRO M er ror is

present, the PCM may have been able to flash DTC 12 but not enable serial data.

4. This check is to see there are any Theft Deterrent DTC stored. If Theft Deterrent system is enabled, this

may be the cause of the no crank condition.

5. This test determines if the vehicle is able to crank. If the vehicle will not crank, refer to Table A-4.0 to

diagnosis starter cranking circuit.

7. T his test is us ed to determ ine the caus e of a "Crank s But Will Not Run," although the PCM is powered up, a

"Cranks But Will Not Run" symptom could exist because of a PCM problem or the vehicle electrical system.

8. Look at all the param eters to determ ine if one is not in a normal s tate with just the ignition "ON" and engine

stopped. Look at the ECT value to see if the value is shifted above or below where it should be. If so, refer

"Diagnostic Aid Table" on DTC 14.

9. Look at all the parameters to determine that all values are within typical ranges for normal operating

temperatures at idle. Keep in mind that a basic engine problem may alter sensor value.

DIAGNOSTIC AIDS:

If the Serial Data circuit is shorted to voltage or earth or open, the vehicle will not crank. Check Serial Data

circuit from PCM to BCM, and from BCM to all other controllers.

DATA LINK CO NNECTO R

YB128

(863)

O/B BLU/B R/B

(1221)

(740)

16 9

(1220)

(155)

B/Y G/W

W/B

(451)

(150)

(1049)

YB 66

INSTRUMENTS

BLU/B

BR/W

(234)

(25)

(14)

(10)

(875)

(155)

(1340)

G/W

(44)

(121)

(8)

(30)

BLU/Y

O/Y

P/BLU

BR/R

V/W

(33)

(946)

(1220)

(88)

(15)

(123)

(85)

(19)

V/R

BR/O

Y/R

B/Y

LBLU

BLU

SUPERVX30

INSTRUMENTPCM

12 SERIAL

DATA

G/W (1220)

LOC. E3

R/B (1221)

CHECK

POWERTRAIN

LAMP

12V

F14

SERIAL

DATA

DIAGNOSTIC

ENABLE

W/B (451)

BCM

D2 E9

DATA LINK

CONNECTOR

1546

1613129

B (150)

B/Y (155 )

YB66

YE114

YE111

YE112

YB175

YB188

YB194

YB164 YB175

YB164

YB128

TABLE A V6 PCM ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK

STEP ACTION VALUE YES NO

1. Ignition "ON" engine "STOPPED".

2. Observe the "CHECK POWERTRAIN" la mp (MIL).

Is the "CHECK POWERTRAIN" lamp (MIL) "ON" steady?

Go to Step 2 If

No, "CHECK

POWERTRAIN"

lamp, Go to

Table A-1 in this

Section

----------------------

If "CHECK

POWERTRAIN"

lamp is flashing

DTC 12, or any

other DTC Go to

Step 10

2. Jumper Data Link Connector (DLC) terminal "6" To "5".

Does "CHECK POWERTRAIN" lamp flash DTC 12, or

any other DTC?

Go to Step 3 Go to Table A-1

in this Section

3. 1. Disconnect Data Link Connector jumper.

2. Install scan tool to Data Link Connector.

Does scan tool display PCM serial data.?

Go to Step 4 Go to Table A-2

in this Section

4. 1. Ignition "ON".

2. Using Tech 2 scan tool, check for DTC 31.

Is DTC 31 set?

Go to DTC 31

Table Go to Step 5

5. Does engine crank? Go to Step 6 Go to

Table A-4.0

6. 1. With Tech 2 scan tool, display DTC(s).

Are any Diagnostic Trouble Codes displayed?

NOTE: Check both Current and History codes.

Refer To

Applicable DTC

Table.

Start with lowest

DTC

Go to Step 7

7. Does engine start? Go to Step 8 Go to

Table A-3.1-1

8. 1. Ignition "ON", engine "STOPPED".

2. Compare Tech 2 scan tool data with typical values

shown on scan data page.

Are values normal or within typical ranges?

Go to Step 9 Refer to

indicated

"Component(s)-

System" checks

in this Section.

9. 1. Run engine until normal operating temperature is

reached.

2. Run engine at 1500 revolutions per minute for 2

minutes, then idle engine.

3. Compare Tech 2 scan data with typical values

shown on "scan data" page.

Are values normal or within typical ranges?

Refer to

"Symptom"

Diagnosis

Tables" in

Section 6C1-2B

of the VX Series

Service

Information

Refer to

indicated

"Component(s)-

System "checks

in this Section

10. Check for earthed diagnostic "TEST" terminal circuit.

Was a problem found? Verify Repair Go to Step 11

11. Replace PCM.

Refer to Section 6C1-3 Service Operations of the VX

Series Service Information, for PCM Security Link

procedure.

Is action complete?

Verify Repair

TABLE A-1 V6 PCM -

NO "CHECK POWERTRAIN" MALFUNCTION INDICATOR LAMP (MIL)

CIRCUIT DESCRIPTION:

There should always be a steady "Check Powertrain" (MIL) lamp with the ignition "ON" and engine stopped.

Battery voltage is supplied directly to the "Check Powertrain" (MIL) lamp bulb through a fused circuit. The

Powertrain Control Module (PCM) will control the lamp via serial data communication to the Body Control

Module (BCM) on the ser ial data circuit. When the PCM determ ines that the "Chec k Powertrain" lam p should be

"ON", the PCM will send a message on the serial data circuit to the BCM requesting the (MIL) "ON". The BCM

will then send a serial data communication message to the instrument panel (IP) Cluster. The IP Cluster will

then determine what message the BCM is sending, and will then turn "ON" the "Check Powertrain" lamp.

TEST DESCRIPTION: Number(s) below refer to step number(s) on the diagnostic Table.

2. Fuse F13 supplies power to the instrument panel cluster. If this fuse is blown, the cluster lamps will not light.

5. If the T ech 2 sc an tool will not comm unicate with the vehicle, there m ay be a problem in the serial data line.

Table A-2 will check this serial data line.

6. If the Tech 2 scan tool is capable of commanding the MIL "ON" and "OFF", the PCM may be at fault.

7. This step checks for proper serial data voltage to the instrument panel (IP) cluster.

YB1 93

(413)

(412)

(1413)

(1412)

(430)

(453)

(815)

V/B

GY/B

B/R

W/R

(897)

G/W

(418)

(1426)

O/W

C16

D16

WT/B

(832)AUTO

(647)

(630)

(832) MAN

LBLU/B

(424)

(423)

(792)

(422)

(1222)

(1223)

(428)

(123)

BR/W

GY/R

Y/B

G/Y

V/W

BLU/W

BLU

(831) Man

(443)

LG/W

(442) (831)AUTO

(441)

LBLU

LBLU/B

(444)

LG/B

P.C.M. CONNECTOR 1

YE194

P.C.M. CONNECTOR 3

LG/B

(366)

(843)

B/W

F16

B/Y

BR/Y

(1228)

(469)

(451)

(841)

BLU

LBLU

(845)

BLU

(1226)

W/B

BLU/W

(435)

(31)

(1229)

(1224)

(846)

(842)

(452)

(774)

(304)

BR/Y

(411)

(439)

GY/BLU

BLU

(1225)

E16

(1427)

(429)

(844)

B/O

(434)

OR AUTO

GY/BLU

(1434)

MAN

(776)

BLU/W

(771)

(772)

(773)

YB 188

P.C.M CONNECTOR 2

(481)

(417)

(740)

BLU

(1456)

V/W

(415)

(1227)

B/Y

(410)

(472)

(259)

(750)

(1221)

B/R

R/B

G/B

(39)

(465)

G/W

(416)

(740)

B12

A12

DATA LINK CO NNECTO R

YB128

(863)

O/B BLU/B R/B

(1221)

(740)

16 9

(1220)

(155)

B/Y G/W

W/B

(451)

(150)

(1049)

YB66

INSTRUMENTS

BLU/B

BR/W

(234)

(25)

(14)

(10)

(875)

(155)

(1340)

G/W

(44)

(121)

(8)

(30)

BLU/Y

O/Y

P/BLU

BR/R

V/W

(33)

(946)

(1220)

(88)

(15)

(123)

(85)

(19)

V/R

BR/O

Y/R

B/Y

LBLU

BLU

SUPERVX30

INSTRUMENTPCM

12 SERIAL

DATA

G/W (1220)

LOC. E3

R/B (1221)

CHECK

POWERTRAIN

LAMP

12V

F14

SERIAL

DATA

DIAGNOSTIC

ENABLE

W/B (451)

BCM

D2 E9

DATA LINK

CONNECTOR

1546

1613129

B (150)

B/Y (155 )

YB66

YE114

YE111

YE112

YB175

YB188

YB194

YB164 YB175

YB164

YB128

TABLE A-1 V6 PCM NO "CHECK POWERTRAIN" MALFUNCTION INDICATOR LAMP (MIL)

STEP ACTION VALUE YES NO

1. Was the "On-Board Diagnostic" (OBD) System Check

performed? Go to Step 2. Go to OBD

System Check in

this Section

2. Check IP cluster fuse F13.

Is fuse OK? Go to Step 3 Go to Step 9

3. 1. Ignition "OFF".

2. Disconnect PCM connectors.

3. Ignition "ON".

4. Probe PCM battery feed circuits and ignition feed

circuit with a test light connected to earth.

Is the test light "ON" for all circuits?

Go to Step 4 Go to Step 15

4. 1. Ignition "OFF".

2. Disconnect PCM connectors.

3. Probe PCM earth circuits with a test light connected

to B+.

Is the test light "ON" for both circuits?

Go to Step 5 Go to Step 16

5. 1. Ignition "OFF".

2. Reconnect PCM connectors.

3. Connect Tech 2 scan tool to DLC.

4. Ignition "ON", engine stopped.

Does Tech 2 scan tool display PCM serial data?

Go to Step 6 Go to Table A-2

6. With scan tool still connected to DLC, command the MIL

"ON" using the scan tool.

Does the MIL turn "ON" when commanded "ON" using

the scan tool?

Go to Step 14 Go to Step 7

7. 1. Ignition "OFF".

2. Remove IP Cluster from dash panel.

3. Ignition "ON".

4. Using DVM, probe IP Cluster connector

terminal

12 with the DVM connected to earth.

Does the DVM display a varying voltage between

the specified value?

3-5 volts Go to Step 8 Go to Step 10

8. Check for poor connection between the IP Cluster

and cluster connector.

Was a problem found?

Verify Repair Go to Step 11

9. Repair short to earth in IP cluster fuse circuit.

Is action complete ? Verify Repair

10. Repair open in the serial data circuit from the BCM

to IP Cluster.

Is action complete?

Verify Repair

11. Check "Check Powertrain " (MIL) bulb for open.

Was a problem found? Go to Step 12 Go to Step 13

12. Replace "Check Powertrain " (MIL) bulb.

Is action complete? Verify Repair

13. Replace IP cluster.

Is action complete? Verify Repair

14. Replace PCM.

Refer to Section 6C1-3 Service Operations of the

VX Series Service Information, for PCM Security

Link procedure.

Is action complete?

Verify Repair

15. Check for short to earth, and repair open in power

circuit that did not light test light.

Is action complete?

Verify Repair

16. Repair open in earth circuit that did not light test

light.

Is action complete?

TABLE A-2 V6 PCM -

NO SERIAL DATA, WILL NOT FLASH DTC 12, MALFUNCTION INDICATOR LAMP (MIL)

"CHECK POW ERTRAIN" LAMP "ON" STEADY

CIRCUIT DESCRIPTION:

There s hould always be a steady (MIL) "Check Powertrain" lamp when the ignition is "O N" and engine stopped.

Battery voltage is supplied directly to the (MIL) "Check Powertrain" lamp bulb. The Powertrain Control Module

(PCM) will control the "Check Powertrain" lamp and turn it "ON" via the serial data communication circuit..

With the ignition "ON", engine stopped and diagnostic "test" terminal earthed, the "Check Powertrain" lamp

should flash a DTC 12, followed by any diagnostic trouble code(s) stored in memory.

A steady lamp suggests a fault in the IP cluster.

With the Tech 2 scan tool connected to the DLC and the ignition switch on, the scan tool should display serial

data communication. If the scan tool does not display serial data, the serial data circuit may be open or shorted.

There are several other control modules that are connected to the serial data line (PCM, BCM, ABS/ETC

module, ECC module, SRS module and IP cluster). Any one of these controllers could cause a fault on the

serial data line. This fault could result in the scan tool not being able to display serial data.

TEST DESCRIPTION: Number(s) below refer to step number(s) on the diagnostic Table.

2. This step checks to see if the PCM will flash DTC 12 or any other DTC.

3. This step checks to see if the Tech 2 scan tool will

communicate with the PCM.

4. Using a Digital Volt\Ohm meter (DVM), there should be 3 to 5 volts at the DLC terminal 9. If the voltage is

higher or lower, serial communication will be effected. This serial data circuit is also connected to several

other controllers. A problem with any one of

these other controllers, may cause serial data communication malfunction.

13. This step c hec ks to see if the Serial Data circ uit is shor ted to voltage or ear th. Chec k Serial Data circuit fr om

PCM, to BCM, and from BCM to all other controllers.

DIAGNOSTIC AIDS:

If there is a fault with the serial data circuit, it could be caused by one or more of the several controllers

connected to this serial data circuit. Isolate the fault by disconnection one at a time each controller until the

serial data communication is restored.

SUPERVX30

INSTRUMENTPCM

12 SERIAL

DATA

G/W (1220)

LOC. E3

R/B (1221)

CHECK

POWERTRAIN

LAMP

12V

F14

SERIAL

DATA

DIAGNOSTIC

ENABLE

W/B (451)

BCM

D2 E9

DATA LINK

CONNECTOR

1546

1613129

B (150)

B/Y (155 )

YB66

YE114

YE111

YE112

YB175

YB188

YB194

YB164 YB175

YB164

YB128

YB1 93

(413)

(412)

(1413)

(1412)

(430)

(453)

(815)

V/B

GY/B

B/R

W/R

(897)

G/W

(418)

(1426)

O/W

C16

D16

WT/B

(832)AUTO

(647)

(630)

(832) MAN

LBLU/B

(424)

(423)

(792)

(422)

(1222)

(1223)

(428)

(123)

BR/W

GY/R

Y/B

G/Y

V/W

BLU/W

BLU

(831) Man

(443)

LG/W

(442) (831)AUTO

(441)

LBLU

LBLU/B

(444)

LG/B

P.C.M. CONNECTOR 1

YE194

P.C.M. CONNECTOR 3

LG/B

(366)

(843)

B/W

F16

B/Y

BR/Y

(1228)

(469)

(451)

(841)

BLU

LBLU

(845)

BLU

(1226)

W/B

BLU/W

(435)

(31)

(1229)

(1224)

(846)

(842)

(452)

(774)

(304)

BR/Y

(411)

(439)

GY/BLU

BLU

(1225)

E16

(1427)

(429)

(844)

B/O

(434)

OR AUTO

GY/BLU

(1434)

MAN

(776)

BLU/W

(771)

(772)

(773)

YB 188

P.C.M CONNECTOR 2

(481)

(417)

(740)

BLU

(1456)

V/W

(415)

(1227)

B/Y

(410)

(472)

(259)

(750)

(1221)

B/R

R/B

G/B

(39)

(465)

G/W

(416)

(740)

B12

A12

DATA LINK CO NNECTO R

YB128

(863)

O/B BLU/B R/B

(1221)

(740)

16 9

(1220)

(155)

B/Y G/W

W/B

(451)

(150)

(1049)

YB66

INSTRUMENTS

BLU/B

BR/W

(234)

(25)

(14)

(10)

(875)

(155)

(1340)

G/W

(44)

(121)

(8)

(30)

BLU/Y

O/Y

P/BLU

BR/R

V/W

(33)

(946)

(1220)

(88)

(15)

(123)

(85)

(19)

V/R

BR/O

Y/R

B/Y

LBLU

BLU

TABLE A-2 V6 PCM - NO SERIAL DATA, WILL NOT FLASH DTC 12, MALFUNCTION INDICATOR LAMP

(MIL) "CHECK POWERTRAIN" LAMP "ON" STEADY

STEP ACTION VALUE YES NO

1. Was the "On-Board Diagnostic" (OBD) System Check

performed? Go to Step 2 Go to OBD

System Check in

this Section.

2. 1. Ignition" ON" engine stopped.

2. Earth diagnostic "TEST" terminal No. 6.

Does "CHECK POWERTRAIN" lamp flash DTC 12 or any

other DTC?

Go to Step 3 Go to Step 6

3. 1. Connect Tech 2 scan tool to DLC.

2. Ignition "ON", engine stopped.

Does Tech 2 scan tool display PCM serial data?

No trouble found Go to Step 4

4. 1. Ignition "ON" engine stopped.

2. Using DVM, probe DLC terminal 9 with DVM

connected to earth.

Does DVM display voltage varying between the specified

value?

3-5 volts Go to Step 5 Go to Step 8

5. Check connections between the DLC and the PCM. If not

OK repair, if connection are OK, Replace PCM,

Refer to Section 6C1-3 Service Operations in this Section

for PCM Security link procedure.

Is action complete?

Verify Repair

6. 1. Ignition "ON" engine stopped.

2. Using DVM, probe DLC terminal 6 with DVM

connected to earth.

Does DVM display voltage at specified value?

5 volts Go to Step 13 Go to Step 12

TABLE A-2 V6 PCM - NO SERIAL DATA, WILL NOT FLASH DTC 12, MALFUNCTION INDICATOR LAMP

(MIL) "CHECK POWERTRAIN" LAMP "ON" STEADY

STEP ACTION VALUE YES NO

7. Replace IP cluster.

Is action complete? Verify Repair

8. Is voltage steady at or above the specified value? 5 volts Go to Step 11 Go to Step 9

9. 1. Connect Tech 2 scan tool to DLC.

2. Ignition "ON", engine stopped.

Does Tech 2 scan tool display BCM serial data?

Go to Step 10 Go to Step 13

10. Repair open or short to earth in the serial data circuit

between the PCM and the DLC.

Is action complete?

Verify Repair

11. Repair short to voltage on the serial data circuit.

NOTE: Insure that none of the other controllers on the

serial data circuit are causing this voltage

problem. Unplug each controller one at a time

to isolate short to voltage.

Is action complete?

Verify Repair

12. Check for an open in the Diagnostic Test circuit from the

PCM to the DLC.

Was a problem found?

Verify Repair Go to Step 5

13. Check for short to earth or short to voltage or open in the

serial data line.

Refer to Diagnostic Aids.

Was a problem found?

Verify Repair Go to Step 7

TABLE A-3.1-1 V6 PCM -

ENGINE CRANKS BUT WILL NOT RUN

CIRCUIT DESCRIPTION:

This is the first of several diagnostic T ables that must be followed in an orderly, progressive fashion in order to

find the cause of a no-start. These Tables assume an adequate supply of good quality fuel is in the fuel tank,

that the cranking motor circuit is in good working order, and that the engine will crank with adequate RPM.

These Tables also assume that no Diagnostic Trouble Code (DTC) 31 or 46 is set in the PCM memory, as

determined by the On-Board Diagnostic Circuit Check. The On-Board Diagnostic System Check is always the

beginning point for all diagnostic procedures.

TEST DESCRIPTION: Number(s) below refer to step number(s) on the diagnostic Table.

1. The PCM must be operable. The On-Board Diagnostic System Check will prove that. There are few

chances that the PCM itself would cause a no-start, but the On-Board Diagnostic System Check will

uncover any problems in the PCM power and earth circuitry.

4. This checks for a short to earth on the injector control circuit. If this were to occur, the engine would be

extremely flooded, since the injectors would be "ON" continuously, and would inject fuel any time there is

fuel pressure.

5. Any time the PCM has been "OFF" for at least 10 seconds, it should energise the Fuel Pump Relay for 2

seconds after the ignition is turned "ON." If the engine is not cranked, the PCM should turn the relay "OFF"

after 2 seconds. Proper operation of the Fuel Pump electrical circuit would be noted here by the test light

being "ON" for 2 seconds after the ignition switch is turned to the "ON" position. After 2 seconds, the test

light should go "OFF."

6. Note that this check is for sufficient voltage at the spark plug wire. If, for some reason, the spark plug

electrodes were wet with fuel (engine f looded), this could c ause a no-start. However, a "flooded" engine is a

symptom of some other problem. There is no normal condition that should ever be able to "flood" the

engine.

7. This is a quick check of the fuel system. The easiest place to install the pressure gauge is where the fuel

pipes come up into the engine compartment. There are 2 hoses, and the gauge must be connected to the

hose or pipe leading directly to the fuel rail. This connection is on the left (passenger) side of the fuel rail

(refer Service Operation 3.11 FUEL CONTROL SYSTEM; Fuel System Pressure Test). The other hose or

pipe leads to the pressure regulator, and no pressure testing is done there. If the pressure is not as

specified, or continues to drop after the pump stops running, the Fuel System Diagnostic Table A-4.3 in this

Section must be used.

SUPERVX017

# 2

# 4 # 6

# 1 # 3 # 5

PCM

B12

BATTERY FEED

(740)

BLU

(841)

(843)

(845)

INJECTOR CONTROL

IN JECTOR VOLTAGE

MONITOR LINE

IGNITION FEED

O/Y (479)

EFI R EL AY

B/W (152)

LOC. E4

P (3 )

O/B (740)

IGN SW

(481)

(39)

(846)

BR/Y

(844)

(842)

F31

F14

F34

BATTERY

R (2)

(1040)

YE112

YE114

YE111

YB194

YB188

YE39 YE39

YB188

NOTE: Use ST 125 spark checker or equivalent. An ST 125 requires about 25,000 volts (25 k ilovolts, or 25 k V)

to "spar k ". Do not us e a s par k plug in open air ear thed to the engine as an indic ation of s uf f ic ient "spar k". Only a

few kilovolts are required to jump the gap of a spark plug outside of the engine, and that would be an

inadequate test of the ignition coil output ability.

INJECTORS

(1)

(842)

(481)

BLU

(6)

(4)

(2)

(846)

(843)

(845)

(841)

(5)

(844)

BR/Y

(3)

FUEL PUMP RELAY

YE 96

(465)

G/W

(152)

B/W V

(120)

(240)

TABLE A-3.1-1 V6 PCM - ENGINE CRANKS BUT WILL NOT RUN

STEP ACTION VALUE YES NO

1. Was the "On-Board Diagnostic" (OBD) System Check

performed? Go to Step 2. Go to OBD

System Check in

this Section.

2. Is DTC 31 present ? Go to DTC 31

Table in this

Section

Go to Step 3

3. Is DTC 46 present ? Go to DTC 46

Table in this

Section

Go to Step 4

4. 1. Check fuel tank quantity .

2. Disconnect ALL injector electrical connectors.

3. Connect test light between the terminals of each

injector harness connector.

• Be very careful to NOT short across the terminals,

or to engine earth.

4. Ignition "ON", note test light.

Is light "OFF" ?

Go to Step 5 Go to Step 8

5. 1. Ignition "OFF".

2. Backprobe Fuel Pump Control Module "6" circuit with

a test light connected to earth.

3. Ignition "ON".

4. Using TECH 2 scan tool, Select Fuel Pump.

5. Activate Fuel Pump

Is test light "ON"?

Go to Step 6 Go to

Table A-4.1-1

in this Section

6. 1. Ignition "OFF".

2. Remove the spark plug leads from 2 spark plugs.

3. Connect ST 125 spark checker (refer note above) to

each individually, and check for spark

while cranking the engine.

4. Check both wires. A few sparks and then nothing

is considered no spark.

Was there spark on both wires ?

Go to Step 7 Go to

Table A-8.1 in

this Section

TABLE A-3.1-1 V6 PCM - ENGINE CRANKS BUT WILL NOT RUN

STEP ACTION VALUE YES NO

7. 1. Ignition "OFF".

2. Reconnect both spark plug leads to spark plugs.

3. Reconnect all injector electrical connectors.

4. Remove Fuel Pump Relay from engine compartment

"FUSE AND RELAY CENTRE," and crank engine

for 15 seconds to relieve any residual fuel pressure.

5. Ignition "OFF," connect Fuel Pressure Gauge

6. Reinstall Fuel Pump Relay

7. Observe fuel pressure when ignition is turned "ON."

8. Pressure should be within the value, and not

continue to drop after pump stops running.

Is fuel pressure at or between the value, and holding

steady?

290 to 410

kPa Go to

Table A-3.2 in

this Section

Go to

Table A-4.3 in

this Section

8. Repair short to earth on Injector Circuit.

Was Injector Circuit shorted to earth ? Verify Repair Go to Step 9

9. Replace PCM.

Refer to Section 6C1-3 Service Operations of the VX

Series Service Information, for PCM Security Link

procedure.

Is action complete?

Verify Repair

TABLE A-3.2 V6 PCM -

ENGINE CRANKS BUT WILL NOT RUN

TEST DESCRIPTION: Number(s) below refer to step number(s) on the diagnostic Table.

6. "ST EADY LIGHT" indicates the PCM is continuously s upplying the earth path on the injector circuit. It is not

a harness problem at this point; That would have been in Table A-3.1-1. This may destroy an injector, as

they are designed to be energised in short pulses and may not withstand 100% "ON" time. If any injector

check s les s than 11.4 ohm s, it c ould be the cause of the def ective PCM. T he PCM can be damaged when it

attempts to energise the injector circuit with a very-low-resistance load. Normal injector resistance is

approximately 12.2 ohms at 20 degrees C per individual injector.

INJECTORS

(1)

(842)

(481)

BLU

(6)

(4)

(2)

(846)

(843)

(845)

(841)

(5)

(844)

BR/Y

(3)

SUPERVX017

# 2

# 4 # 6

# 1 # 3 # 5

PCM

B12

BATTERY FEED

(740)

BLU

(841)

(843)

(845)

INJECTOR CONTROL

IN JECTOR VOLTAGE

MONITOR LINE

IGNITION FEED

O/Y (479)

EFI R EL AY

B/W (152)

LOC. E4

P (3 )

O/B (740)

IGN SW

(481)

(39)

(846)

BR/Y

(844)

(842)

F31

F14

F34

BATTERY

R (2)

(1040)

YE112

YE114

YE111

YB194

YB188

YE39 YE39

YB188

TABLE A-3.2 V6 PCM - ENGINE CRANKS BUT WILL NOT RUN

STEP ACTION VALUE YES NO

1. Was the "On-Board Diagnostic" (OBD) System Check

performed? Go to Step 2. Go to OBD

System Check in

this Section.

2. • From Table A-3.1-1.

1. Ignition "OFF".

2. With all injectors disconnected, connect test light

across both harness terminals of one injector

connector.

• Be very careful to not short across the terminals, or

to engine earth.

3. Have a helper crank the engine while you closely

observe the test light.

4. Test light should blink while cranking, indicating

electrical injector pulses are present, do this test for

all injectors

Did test light blink while cranking ?

Go to Step 3 If

there was no

blinking light, Go

to Table 3.3 in

this Section

----------------------

If the test light

was on steady

(no blinking light)

Go to Step 6

3. Check the remaining 5 injector connectors for

blinking test light, as described in step 2.

Did all the remaining injector connectors blink the

test light ?

Go to Step 4 Go to Step 5

4. • At this point, the fuel control system, fuel delivery

system, and ignition system are OK.

Check For:

• Fouled spark plugs.

• Proper MAF sensor operation. If engine

will start with MAF sensor electrical

connector disconnected, refer Table

A-6.1 in this Section.

• Proper TP sensor circuit operation. Use

Tech 2 scan tool to monitor TP sensor

signal. If voltage is over 1.25 volts with

throttle closed, refer Table A-6.2 in this

Section.

• Restricted exhaust system. Loosen

front pipe from exhaust manifold(s). If

the engine will start, refer Table A-13 in

this Section.

• Improper engine coolant temperature

(ECT) sensor resistance. Refer DTC 14

Diagnostic Aids in this Section to check

resistance of ECT sensor.

• Water or foreign material in fuel, or

incorrect fuel.

• Spark plug wires crossed.

• Camshaft timing chain.

• Inadequate engine compression.

Is action complete?

Verify Repair

5. Repair open in injector power circuit and injector circuit to

connector that did not blink the test light.

Is action complete ?

Verify Repair

TABLE A-3.2 V6 PCM - ENGINE CRANKS BUT WILL NOT RUN

STEP ACTION VALUE YES NO

6. Check for a short to earth in injector circuit that caused

test light to stay "ON" steady.

Was a problem found?

Verify Repair Go to Step 7

7. Check resistance across each injector. Each injector

should be between the specified value.

Is each injector at the value ?

11.4 - 12.6

ohms Go to step 8 Go to step 9

8. Replace PCM.

Refer to Section 6C1-3 Service Operations of the VX

Series Service Information, for PCM Security Link

procedure.

Is action complete?

Verify Repair

9. 1. Replace any injector that did not measure within

the specified value.

2. Retest beginning at Step 2.

Is action complete?

11.4 - 12.6

ohms Verify Repair

TABLE A-3.3 V6 PCM -

ENGINE CRANKS BUT WILL NOT RUN

TEST DESCRIPTION: Number(s) below refer to step number(s) on the diagnostic Table.

2 "NO LIGHT" indicates no PCM control of the injector. Fuse F34 supplies +12 volts to the injectors. Probe

both terminals of one injector connector with a test light to earth. There should be a light on only one

terminal, confirming ignition voltage to one terminal, but not both.

3. The PCM inj ec tor contr ol c irc uit may be open. Rec onnect the inj ec tors . Us ing a tes t light connec ted to ear th,

check for a light at the PCM connector terminals. A light at this point indicates that injector control circuit is

not "open." The voltage to light that test light comes from circuit 481, through the injector windings, and

continues through the injector control circuit to PCM connector terminals.

7. There is no terminal identification on the relay connector socket, but the relay itself has terminal numbers.

Make certain the correct relay connector socket terminal (NOT the relay) is being probed.

SUPERVX017

# 2

# 4 # 6

# 1 # 3 # 5

PCM

B12

BATTERY F EED

(740)

BLU

(841)

(843)

(845)

INJECTOR CONTROL

IN JE C TOR VOLTAG E

MONITOR LINE

IGNITION FEED

O/Y (479)

EFI R EL AY

B/W (152)

LOC. E4

P (3 )

O/B (740)

IGN SW

(481)

(39)

(846)

BR/Y

(844)

(842)

F31

F14

F34

BATTERY

R (2)

(1040)

YE112

YE114

YE111

YB194

YB188

YE39 YE39

YB188

YB1 93

(413)

(412)

(1413)

(1412)

(430)

(453)

(815)

V/B

GY/B

B/R

W/R

(897)

G/W

(418)

(1426)

O/W

C16

D16

WT/B

(832)AUTO

(647)

(630)

(832) MAN

LBLU/B

(424)

(423)

(792)

(422)

(1222)

(1223)

(428)

(123)

BR/W

GY/R

Y/B

G/Y

V/W

BLU/W

BLU

(831) Man

(443)

LG/W

(442) (831)AUTO

(441)

LBLU

LBLU/B

(444)

LG/B

P.C.M. CONNECTOR 1

YE194

P.C.M. CONNECTOR 3

LG/B

(366)

(843)

B/W

F16

B/Y

BR/Y

(1228)

(469)

(451)

(841)

BLU

LBLU

(845)

BLU

(1226)

W/B

BLU/W

(435)

(31)

(1229)

(1224)

(846)

(842)

(452)

(774)

(304)

BR/Y

(411)

(439)

GY/BLU

BLU

(1225)

E16

(1427)

(429)

(844)

B/O

(434)

OR AUTO

GY/BLU

(1434)

MAN

(776)

BLU/W

(771)

(772)

(773)

YB 188

P.C.M CONNECTOR 2

(481)

(417)

(740)

BLU

(1456)

V/W

(415)

(1227)

B/Y

(410)

(472)

(259)

(750)

(1221)

B/R

R/B

G/B

(39)

(465)

G/W

(416)

(740)

B12

A12

E.F.I RELAY

YE 39

B/W

P/B

O/Y

(152)

(39)

(479)

(1040)

ENGINE 12V BUS

INJECTORS

(1)

(842)

(481)

BLU

(6)

(4)

(2)

(846)

(843)

(845)

(841)

(5)

(844)

BR/Y

(3)

TABLE A-3.3 V6 PCM - ENGINE CRANKS BUT WILL NOT RUN

STEP ACTION VALUE YES NO

1. Was the "On-Board Diagnostic" (OBD) System Check

performed? Go to Step 2. Go to OBD

System Check in

this Section.

2. 1. Ignition "OFF"

2. Disconnect injector connectors. From Table A-3.2

No Light

3. Ignition "ON," engine stopped.

4. Probe each terminal of each injector harness

connector with a test light to earth.

Is the test light "ON" at each terminal?

Go to Step 3 If

the test light was"

ON" at both

terminals, repair

short to voltage

on injector circuit.

----------------------

If there was no

light "ON",

Go to Step 7

3. 1. Ignition "OFF".

2. Reconnect injectors.

3. Ignition "ON".

4. Backprobe PCM injector control terminals with a

test light connected to earth.

Is test light "ON" at each terminal?

Go to Step 4 Go to Step 12

4. 1. Ignition "ON".

2. With a Tech 2 scan tool, monitor TP sensor

signal voltage.

Is voltage less than value?

1.25 volts Go to Step 5 Go to

Table A-6.2

in this Section

5. Check for faulty crankshaft reference High signal input to

PCM connector terminal.

Was a problem found?

Verify Repair Go to Step 6

6. Replace PCM.

Refer to Section 6C1-3 SERVICE OPERATIONS of the

VX Series Service Information, for PCM Security Link

procedure.

Is action complete?

Verify Repair

TABLE A-3.3 V6 PCM - ENGINE CRANKS BUT WILL NOT RUN

STEP ACTION VALUE YES NO

7. 1. Ignition "OFF".

2. Disconnect EFI relay.

3. Ignition "ON".

4. Probe EFI relay harness connector terminal "30" and

terminal "85" with a test light connected to earth.

Is the test light "ON" at both circuits?

Go to Step 8 Go to Step 13

8. 1. Ignition "OFF".

2. Disconnect EFI relay.

3. With test light connected to 12 volts, probe relay

harness terminal earth circuit of EFI relay.

Is test light "ON", is it?

Go to Step 9 Go to Step 14

9. Check injector fuse F34 for an open.

Was a problem found? Go to step 15 Go to Step 10

10. Check for an open in injector power circuit from fuse F34

to injector splice.

Was a problem found?

Verify Repair Go to Step 11

11. Replace EFI relay.

Is action complete? Verify Repair

12. Repair open injector control circuit that did not light test

light.

Is action complete?

Verify Repair

13. Check fuses and repair circuit that did not turn

"ON" test light.

Is action complete?

Verify Repair

14. Repair earth circuit to EFI relay.

Is action complete? Verify Repair

15. Repair short to earth in fuse circuit.

Replace fuse.

Is action complete?

Verify Repair

TABLE A- 4.0 V6 PCM -

STARTER CRANKING CIRCUIT

CIRCUIT DESCRIPTION:

W hen the ignition is turned to the "ON" position, battery power is supplied from a fusible link to the Start Relay

terminal "30". As the ignition switch is turned to the START position, power is supplied to the Start Relay

terminal 85. The PCM supplies the earth signal needed to energise the Start Relay and allows power to the

starter motor.

When the ignition is turned “ON”, the PCM will then look for the proper Theft Deterrent signal sent from the

BCM. If the PCM has determined that the proper Theft Deterrent signal is present, the PCM will allow the

vehicle to crank. If the PCM determines that a improper Theft Deterrent signal was sent from the BCM, or no

Thef t Deter rent s ignal was s ent, the PCM will not supply a earth signal from the PCM ter m inal to the Start Relay

terminal "86". When the Start Relay receives this earth signal from the PCM, the relay will be energised,

allowing the starter motor to operate. This removed earth signal to the Start Relay will cause the vehicle not to

crank.

If there is a problem with the Theft Deterrent signal from the BCM to the PCM, DTC 31 will set.

TEST DESCRIPTION: Number(s) below refer to step number(s) on the diagnostic Table.

2. This step checks to see if DT C 31 is set. This DT C could prevent the vehicle from cranking. This step also

verifies that if a PCM was replaced, that the Security Link procedure was performed.

3. This step checks to see if power is being applied to the starter motor. If test light lights, the problem is with

the starter motor.

12. This step checks the adjustment of the Neutral start switch.

VXSC033

PCM

BCM

SERIAL

DATA

STARTER

ENABLE

SERIAL

DATA

MAIN

BATTERY

LOC.

F31

A5/A6O/B (740)

(1040)

BATTERY M AIN POWER

R (2H)

F14

E20/D6P/B (39) IGNITION ON

15a 15 50

30 ACC

IGN

START

IGNITION SWI TCH

P (3)

LOC. G1

E2/D2

R/B (1221)

GY/BLU

(1434)

(434)

NEUTRAL START

BACK-UP SW.

( MANUAL

TRANS)

STARTER

MOTOR

START

RELAY

V (5)

V/W

(6)

36 85

HIGH SERIES

BCM TERMINALS

NOMINA TED FIRST

YE111 YB194

YB188

YB175

YB164

YB175

YB164

YB176

YB165

YE112

YB44

YE49

YB35 YB35

STARTER MOTOR SOLENOID

(6)

IGNITION SWITCH

YB 44

(4)

(5)

(2)

(3)

Y E 49

START RELAY

(5)

(2)

V/W

(434)

(6)

NEUTRAL START & BACK-UP SWITCH

(1434)

GY/BLU

(24)

LG GY

(434)

(750)

B/R

(42)

BR/BLU

TABLE A-4.0 V6 PCM - STARTER CRANKING CIRCUIT

STEP ACTION VALUE YES NO

1 Was the "On-Board Diagnostic" (OBD) System Check

performed? Go to Step 2 Go to OBD

System Check in

this Section

2 1. Install a Tech 2 scan tool.

2. Using the scan tool, check for a DTC 31.

Is DTC 31 set?

Go to the

appropriate DTC

Table

Go to Step 3

3 1. Ignition OFF.

2. Using a test light, probe the starter solenoid terminal

"S" with test light connected to earth.

3. Have a helper turn the ignition switch to the START

position, note the test light.

Does the test light illuminate when the ignition switch is

turned to the START position?

Refer to Section

6D1-2 Starting

System - V6 in

Section 2 of this

Service

Information

Go to Step 4

4 1. Remove the start relay.

2. With a test light connected to earth probe the start

relay harness terminal 30.

3. Turn the ignition ON.

Does the test light illuminate?

Go to Step 5 Go to Step 15

5 1. With the start relay still removed and the test light

connected to earth probe the start relay harness

terminal 85.

2. Turn the ignition to the start position.

Did the test light illuminate?

Go to Step 7 Go to Step 14

6 Check for an open circuit between the starter solenoid

and the Start Relay.

Was a problem found?

Verify Repair Go to Step 8

7 1. Ignition OFF.

2. Remove the Start Relay.

3. Connect a test light between the relay harness

terminal 85 and terminal 86.

4. Turn the ignition switch to the START position.

Does the test light illuminate when the ignition switch is

turned to the START position?

Go to Step 6 Go to Step 9

8 Replace the Start Relay.

Is the action complete? Verify Repair

9 Is the vehicle equipped with a manual transmission? Go to Step 10 Go to Step 12

10 1. Ignition ON engine OFF.

2. With a test light connected to B+, probe both of the

circuits at the neutral start switch.

Did the test light illuminate at both terminals?

Go to Step 16 Go to Step 11

11 Check the adjustment of the neutral start switch. If the

Adjustment is OK, replace the neutral start switch.

Is the action complete?

Verify Repair

TABLE A-4.0 V6 PCM - STARTER CRANKING CIRCUIT (CONT)

STEP ACTION VALUE YES NO

12 Check for open circuit from the neutral start switch to the

Start Relay.

Was a problem found?

Verify Repair Go to Step 17

13 Repair the short to earth in the faulty circuit.

Replace the fusible link or the fuse as necessary.

Is the action complete?

Verify Repair

14 Repair the open in the ignition circuit.

Is the action complete? Verify Repair

15 Check for an open circuit 2 including the fusible link.

Is the action complete? Verify Repair

16 Repair the open in circuit 434.

Is the action complete? Verify Repair

17 Replace PCM.

Refer to Section 6C1-3 Service Operations of the VX

Series Service Information for PCM Security Link

procedure.

Is action complete?

Verify Repair

TABLE A-4.1-1 V6 PCM -

FUEL PUMP ELECTRICAL CIRCUIT

Circuit Description:

W hen the ignition switch is first turned "ON", the P CM energises the Fuel Pum p Rela y which applies power to the

Fuel Pump Control Module. The Fuel Pump Relay will remain "ON" as long as the engine is cranking or running

and the PCM is receiving reference pulses. If no reference pulses are present, the PCM de-energises the Fuel

Pump Relay within 2 seconds after the ignition is turned "ON" or the engine is stopped. The Fuel Pump delivers

fuel to the fuel rail injectors, then to the fuel pressure regulator. The pressure regulator control fuel pressure by

allowing ex ces s f uel to be returne d to th e f uel ta nk. W ith the engi ne st op ped , the F uel Pump c an be turne d "ON" b y

using the Tech 2 scan tool output controls function.

The PCM alters Fuel Pump speed by applying or remov ing a dut y c yc le on the F uel Pump PW M driver c ircuit 411

to the Fuel Pum p Control Modu le. Under nor mal driv ing conditio ns, the PCM will appl y a 33% PW M earth signal to

the Fuel P ump Control M od ule c irc u it 41 1. T his 33% d ut y c ycle wil l com mand the Fuel Pump Control Module to r un

the fuel pump at a lower s peed, (lo wer f uel vo lume, low volt age s up pl ied t o f uel pump, between 7 to 9 vo lts.). When

higher fuel volume is required due to increased engine load, the PCM will remove the supplied 33% PWM earth

signal f rom c ircuit 411. T his will c ause the Fu el Pum p Control M odule to s witch i nternall y and allo w the Fue l Pum p

to run at a hi gher sp eed ( hi gher fuel volu me, s ystem volta ge appli ed to f ue l p ump). The PCM a ls o compens a tes f or

low system voltage by commanding the Fuel Pump Control Module to switch to high speed Fuel Pump , when

system voltage is low.

TEST DESCRIPTION: Number(s) below refer to step number(s) on the diagnostic Table.

3. Checks that fuel pressure is sufficient for the vehicle to start.

4. Ensures that the Fuel Pump PWM driver circuit and the PCM are capable of controlling Fuel Pump speed.

5. Verifies that the Fuel Pump feed and earth circuits are OK between the Fuel Pump Control Module and the

Fuel Pump , and that the Fuel Pump can deliver adequate pressure to the fuel rail.

6. Checks the feed circuit to the Fuel Pump Control Module.

8. Ensures that the Fuel Pump PWM driver circuit is not shorted to earth.

13. Checks the ignition feed circuit to the Fuel Pump Relay contacts.

14. Checks the earth circuit for the Fuel Pump Relay coil.

15. Ensures that the Fuel Pump Relay driver circuit is OK and that the PCM is capable of controlling the Fuel Pump

Relay. Using the Tech 2 scan tool to command the Fuel Pump Relay allows only a 2 second "ON" time.

21. Checks the Fuel Pump Relay driver circuit for a short to earth.

26. If the Fuel Pump is operating but incorrect pressure is noted, the Fuel Pump wiring is OK. Go to Table A-4.3.

28. Determines weather the problem is being caused by an open in the Fuel Pum p feed circuit or the Fuel Pump

earth circuit.

31. Ensures that the Fuel Pump speed control PWM circuit is OK and that the PCM can control the Fuel Pump

speed control PWM driver.

37. The fuel pump on this Supercharged Engine application is serviceable from the Modular Sender Assembly.

Refer to Section 6C1-3 Service Operations in the VX Series Service Information for replacement procedures.

NOTICE:

When performing this diagnostic Table, make certain that the drive wheels are blocked and the parking

brake is firmly set.

YB1 93

(413)

(412)

(1413)

(1412)

(430)

(453)

(815)

V/B

GY/B

B/R

W/R

(897)

G/W

(418)

(1426)

O/W

C16

D16

WT/B

(832)AUTO

(647)

(630)

(832) MAN

LBLU/B

(424)

(423)

(792)

(422)

(1222)

(1223)

(428)

(123)

BR/W

GY/R

Y/B

G/Y

V/W

BLU/W

BLU

(831) Man

(443)

LG/W

(442) (831)AUTO

(441)

LBLU

LBLU/B

(444)

LG/B

P.C.M. CONNECTOR 1

YE194

P.C.M. CONNECTOR 3

LG/B

(366)

(843)

B/W

F16

B/Y

BR/Y

(1228)

(469)

(451)

(841)

BLU

LBLU

(845)

BLU

(1226)

W/B

BLU/W

(435)

(31)

(1229)

(1224)

(846)

(842)

(452)

(774)

(304)

BR/Y

(411)

(439)

GY/BLU

BLU

(1225)

E16

(1427)

(429)

(844)

B/O

(434)

OR AUTO

GY/BLU

(1434)

MAN

(776)

BLU/W

(771)

(772)

(773)

YB 188

P.C.M CONNECTOR 2

(481)

(417)

(740)

BLU

(1456)

V/W

(415)

(1227)

B/Y

(410)

(472)

(259)

(750)

(1221)

B/R

R/B

G/B

(39)

(465)

G/W

(416)

(740)

B12

A12

FUEL TANK

(156)

(155)

B/BLU

B/Y

(30)

(120)

YR45

FUEL CONTRO L MODULE

LBLU

V/W

(120)

(411)

(1120)

(489)

(156)

B/W

B/BLU

FUE L PUMP RELAY

YE96

(465)

G/W

(152)

B/W V

(120)

(240)

TABLE A-4.1-1 V6 PCM - FUEL PUMP ELECTRICAL CIRCUIT

STEP ACTION VALUE YES NO

1. Was the "On-Board Diagnostic" (OBD) System Check

performed? Go to Step 2. Go to OBD

System Check.

2. Are any DTC’s set? Go to DTC Table

first Go to step 3

STEP ACTION VALUE YES NO

3. 1. Connect Fuel Pressure Gauge to fuel pressure tap

fitting.

2. Ignition "ON".

3. Select Fuel Pump Relay output control with the Tech

2 scan tool.

4. Observe the pressure gauge while turning the fuel

pump "ON" with the Tech 2.

5. Note fuel pressure on Fuel Pressure Gauge.

Is proper fuel pressure indicated?

290 to 410

kPa Go to Step 4 Go to Step 5

4. 1. Engine idling.

2. Remove vacuum hose from fuel pressure regulator,

and plug hose.

3. Observe the Fuel Pressure Gauge at idle.

4. Using scan tool, select Fuel Pump Speed , and select

High Speed.

Does the fuel pressure increase slightly from the idle

Position when the fuel pump High Speed is turned "ON"

Then turned "OFF"?

No problem

found Go to Step 31

5. 1. Ignition "OFF".

2. Disconnect Fuel Pump Control Module.

3. Connect a fused jumper wire between Fuel Pump

Control Module harness connector terminal 6 (Fuel

Pump power feed circuit) and +12. volts.

4. Connect a second jumper between the Fuel Pump

Control Module harness connector terminal 5 (Fuel

Pump earth circuit) and chassis earth.

5. Note the fuel pressure on the Fuel Pressure Gauge

Is proper fuel pressure indicated?

290 to 410

kPa Go to Step 6 Go to Step 26

6. 1. Ignition "OFF".

2. Disconnect the jumpers from the Fuel Pump Control

Module connector.

3. Connect a test light between the Fuel Pump Control

Module harness connector terminal 8 (Fuel Pump

Control Module relay feed circuit) and earth.

4. Ignition "ON".

5. Using the Tech 2 scan tool output control functions,

command the Fuel Pump Relay "ON".

6. Observe the test light.

Did the test light turn "ON"?

Go to Step 7 Go to Step 13

7. Probe terminal 4 (Fuel Pump Control Module earth circuit)

with a test light to +12 volts.

Is the test light "ON"?

Go to Step 8 Go to Step 25

8. 1. Ignition "OFF".

2. Disconnect the PCM connectors.

3. Probe the Fuel Pump Control Module PWM driver

circuit at the PCM connector with a test light

connected to +12 volts.

Is the test light "ON"?

Go to Step 9 Go to Step 10

9. Locate and repair short to earth in the Fuel Pump Control

Module PWM driver circuit .

Is action complete?

Go to Step 39

STEP ACTION VALUE YES NO

10. 1. Ignition "OFF".

2. Reconnect PCM connectors.

3. Ignition "ON".

4. Install a volt/ohmmeter to measure voltage between

the Fuel Pump Control Module connector terminal 7

(Fuel Pump Control Module PWM driver circuit )

and terminal 4 (earth circuit ).

5. Using the Tech 2 scan tool relay output test function,

command the Fuel Pump Relay "ON" and "OFF".

Does the voltage measure at or above the specified value

while the Fuel Pump Relay is commanded "ON"?

8 volts Go to Step 11 Go to Step 38

11. 1. Ignition "OFF".

2. Reconnect the Fuel Pump Control Module electrical

connector.

3. Ignition "ON".

4. Using a test light, backprobe between the Fuel Pump

Control Module connector terminal 6 (Fuel Pump

power feed circuit ) and terminal 5 (Fuel Pump

earth circuit ).

5. Using the Tech 2 scan tool relay output test functions,

command the Fuel Pump Relay "ON" and "OFF".

6. Observe the test light.

Is the test light "ON" while the Fuel Pump Relay is

commanded "O N"?

Go to Step 12 Go to Step 34

12. 1. Check for a poor connections at the Fuel Pump

Control Module.

2. If a problem is found, replace faulty terminals as

necessary.

Was a problem found?

Go to Step 39 Refer to

Diagnostic Aids

13. 1. Ignition "OFF".

2. Disconnect the Fuel Pump Relay.

3. Ignition "ON".

4. Probe the Fuel Pump Relay fused power feed circuit

with a test light to earth.

Is the test light "ON"?

Go to Step 14 Go to Step 19

14. Connect test light between the Fuel Pump Relay power

feed circuit and the Fuel Pump Relay earth circuit .

Is the test light "ON"?

Go to Step 15 Go to Step 20

15. 1. Connect the test light between the Fuel Pump Relay

control circuit, and the Fuel Pump Relay earth

circuit .

2. Using the Tech 2 scan tool output control function,

command the Fuel Pump Relay "ON".

Is the test light "ON" when the Fuel Pump Relay is

commanded "O N"?

Go to Step 16 Go to Step 21

16. 1. Connect a fused jumper wire between Fuel Pump

Relay connector power feed circuit ( terminal 3)

and output power feed circuit ( terminal 5).

2. Probe the Fuel Pump Control Module Fuel Pump

power feed circuit at the Fuel Pump Control

Module harness connector (terminal 6) with a test

light to earth.

Is the test light "ON"?

Go to Step 17 Go to Step 24

17. 1. Check for a faulty terminal connection at the Fuel

Pump Relay.

2. If a problem is found, repair terminals as necessary.

Was a problem found?

Go to Step 39 Go to Step 18

STEP ACTION VALUE YES NO

18. Replace the Fuel Pump Relay.

Is action complete? Go to Step 39

19. Locate and repair open in Fuel Pump Relay fused power

feed circuit .

Is action complete?

Go to Step 39

20. Locate and repair open in Fuel Pump Relay earth circuit.

Is action complete? Go to Step 39

21. 1. Ignition "OFF".

2. Disconnect the PCM connectors.

3. Probe the Fuel Pump Relay control circuit at the PCM

connector with a test light to +12 volts.

Is test light "ON"?

Go to Step 22 Go to Step 23

22. Locate and repair short to earth in the Fuel Pump Relay

control circuit .

Is action complete?

Go to Step 39

23. 1. Check for the following conditions:

• Fuel Pump Relay control circuit for an open between

the Fuel Pump Relay and the PCM.

• Fuel Pump Relay control circuit for a poor terminal

connection at the PCM.

2. If a problem is found, repair as necessary.

Was a problem found?

Go to Step 39 Go to Step 38

24. Check for a open or poor connection in the Fuel Pump

Control Module Fuel Pump power feed circuit .

Was a problem found?

Go to Step 39 Go to Step 35

25. Locate and repair open in Fuel Pump Control Module earth

circuit .

Is action complete?

Go to Step 39

26. Remove the fuel tank filler cap and listen for the Fuel Pump

running.

Is the Fuel Pump running?

Go to

Table A-4.3 Go to Step 27

27. 1. Using fused jumper wires, jumper Fuel Pump control

module terminal 6 circuit to +12 volts, and

jumper terminal 5 circuit to earth.

2. Raise the vehicle.

3. Disconnect the Fuel Pump electrical connector at

fuel tank.

4. Connect a test light between the Fuel Pump

electrical connector power feed circuit , and fuel

pump earth circuit at PCM side of connector.

Is the test light "ON"?

Go to Step 39 Go to Step 28

28. Probe the Fuel Pump power feed circuit at the Fuel Pump

electrical connector with a test light connected to chassis

earth.

Is the test light "ON"?

Go to Step 30 Go to Step 29

29. Locate and repair open in the Fuel Pump power feed circuit

Is action complete?

Go to Step 39

30. Locate and repair open in the Fuel Pump earth circuit .

Is action complete? Go to Step 39

STEP ACTION VALUE YES NO

31. 1. Ignition "OFF"

2. Reconnect fuel pressure regulator vacuum hose.

3. Using a test light, backprobe between the Fuel Pump

control module terminal 7 (Fuel Pump Control

Module PWM circuit ) and terminal 8 (Fuel Pump

Control Module Fuel Pump Relay circuit ).

4. Ignition "ON", engine idlin g.

5. Observe the test light while the engine is idling.

6. Using scan tool, select Fuel Pump Speed , and select

High Speed.

Is the test light "ON" when the engine is idling, and "OFF"

when the fuel pump High Speed is turned "ON" ?

Go to Step 32 Go to Step 33

32. 1. Using a volt/ohmmeter, backprobe between Fuel

Pump control mod ule terminal 5 (Fuel Pump earth

circuit ) and terminal 6 (Fuel Pump power supply

circuit ).

2. Engine idling for longer than 15 seconds.

3. Observe the voltage on the volt/ohmmeter while the

engine is idling.

4. Using scan tool, select Fuel Pump Speed , and select

High Speed.

• Idle speed voltage is the first value shown.

• Fuel Pump High Speed voltage is the second value

shown.

Does the voltage measure near the specified values?

8-9 volts

at idle

+12 volts

Fuel Pump

High Speed

Go to Step 36 Go to Step 34

33. 1. Check for the following conditions:

• Fuel Pump PWM driver circuit for an open or short to

voltage between the Fuel Pump Control Module and

the PCM.

• Fuel Pump PWM driver circuit for a poor terminal

connection at the PCM.

2. If a problem is found, repair as necessary.

Was a problem found?

Go to Step 39 Go to Step 38

34. 1. Check terminal connections at the Fuel Pump Control

Module.

2. If a problem is found, repair faulty terminal(s) as

necessary.

Was a problem found?

Go to Step 39 Go to Step 35

35. Replace the Fuel Pump Control Module.

Is action complete? Go to Step 39

36. 1. Check terminal connections at the Fuel Pump.

2. If a problem is found, repair faulty terminal as

necessary

Was a problem found?

Go to Step 39 Go to Step 37

37. Replace the Fuel Pump.

Is action complete? Go to Step 39

38. Replace PCM.

Refer to Section 6C1-3 Service Operations in this Volume,

for PCM Securit y Link procedure.

Is action complete?

Go to Step 39

39. 1. Ignition "ON", select Fuel Pump Relay output control

with the Tech 2 scan tool.

2. Observe the Fuel Pressure Gauge while turning the

fuel pump "ON" with the Tech 2 scan tool.

3. Note the fuel pressure on the Fuel Pressure Gauge.

Is proper fuel pressure indicated?

290 to 410

kPa Go to Step 40 Go to Step 5

STEP ACTION VALUE YES NO

40. 1. Ignition "OFF".

2. Fuel Pressure Gauge still installed.

3. Remove vacuum hose from fuel pressure regulator, and

plug hose.

4. Ignition "ON", engine idling.

5. Observe the Fuel Pressure Gauge at idle.

6. Using scan tool, select Fuel Pump Speed , and select

High Speed.

Does the fuel pressure increase slightly from the idle

Position when the fuel pump High Speed is turned "ON"?

Repair complete.

If a driveability

symptom exists,

Refer to Section

6C1-2B

Symptoms.

Go to Step 31

1. Fuel Pressure Too LOW or Too HIGH or

Pressure That Continues to Drop After The

Ignition is Turned OFF Can Cause The

Following Driveability Complaints:

• Poor Idle Quality

• Excessive Exhaust Odor

• Poor Fuel Economy

• Excessive Cranking Time

• Detonation

• Loss of Power

• DTC 44 or 64

• DTC 45 or 65

2. Fuel Rail

3. Fuel Injectors

4. Vacuum Hose Fitting

5. Fuel Pressure Regulator

6. Fuel Return Line

7. Fuel Pressure Gauge Connects Into This Line For

Testing

8. Fuel Feed (Pressure) Line

9. Fuel Filter

10. Fuel Tank

TABLE A-4.3 V6 PCM -

FUEL DELIVERY SYSTEM

CIRCUIT DESCRIPTION:

Fuel is drawn from the tank by the electric fuel pump and is fed under pressure through a fuel filter and continues

on into the fuel rail and then is injected into the ports through the fuel injectors.

Fuel pressure in the system is governed by the fuel pressure regulator, in such a manner that a certain pressure

difference between fuel pressure and inlet manifold pressure is maintained. Excess fuel above the regulated

pressure is returned to the fuel tank by the pressure regulator and the fuel return line.

The fuel pump has a check valve to maintain pressure at the fuel rail after the pump stops running. The check

valve plays an important part in the fuel delivery system: to keep the fuel rail "charged" with fuel after the pumps

shuts of f . When the engine begins c r ank ing to s tar t, there is no delay before f uel injec tion begins , and quic k starting

is ensured. The check valve is inside the fuel pump, and is not serviceable.

TEST DESCRIPTION: Number(s) below refer to step number(s) on the diagnostic Table.

2. T hese are elec trical system chec k s, which m ust both be O K befor e any f urther fuel delivery system chec k s can

be made. If either do not "pass," refer Table A-4.1-1, Fuel Pump Electrical Circuit in this Section.

3. This has eleven sequenced segments to follow in order. "1" and "2" is to reduce the residual pressure in the

lines before opening the lines. "6" is to purge any air from the lines after installing the gauge. It also serves to

cool the fuel rail for more accurate pressure testing if the engine is hot. "8" is to allow the PCM to "power

4280

down," so the next time the ignition is turned "ON," the PCM will energise its Fuel Pump Relay control for 2

seconds. "9" and "10" indicate what the pressure should do when the ignition is turned "ON". There are two

things to note: (A) - pressure reading, and (B) - that the pressure does not continue to drop after the pump

stops running.

4. At this point, the regulated pressure should be within specification, and the pressure does not drop when the

pump stops running. This check is to see if the pressure regulator will modulate the regulated fuel pressure

when the vacuum signal to it changes. During normal engine operation, the regulated pressure can change,

based on inlet manifold pr essure. W hen the m anifold pres sure is at its lowest (engine idling) , fuel pressur e will

be at its lowest r egulated pr ess ur e. When inlet m anif old pr es sur e is at its highes t ( wide open throttle), r egulated

fuel pressure will be at its highest regulated pressure.

FUEL PUMP RELAY

YE 96

(465)

G/W

(152)

B/W V

(120)

(240)

TABLE A-4.3 V6 PCM - FUEL DELIVERY SYSTEM

STEP ACTION VALUE YES NO

1. Was the "On-Board Diagnostic" (OBD) System Check

performed? Go to Step 2. Go to OBD

System Check in

this Section.

2. 1. Ignition "ON".

2. Using TECH 2 scan tool, Select FUEL PUMP .

3. Turn Fuel Pump "On" and "OFF"

4. Listen for Fuel Pump in fuel tank.

Does fuel pump run when turned "ON" with TECH

2 scan tool?

Go to Step 3 Go to

Table A-4.1-1

in this Section

3. 1. Disable output test for Fuel Pump .

2. Turn ignition "OFF".

3. Remove Fuel Pump Relay from engine compartment

fuse and relay centre, then crank engine for 15

seconds to relieve any residual fuel pressure.

4. Connect Fuel Pressure Gauge, then reinstall fuel

pump relay.

5. Remove vacuum hose from fuel pressure

regulator.

6. Ignition "ON",

7. Enable output test with Tech 2 scan tool for Fuel

Pump and allow pump to run for 15 seconds. This is

to purge the lines of any air before pressure testing.

8. Disable output test for Fuel Pump .

9. Ignition "OFF" for 10 seconds.

10. Observe fuel pressure when ignition is turned "ON".

11. Pressure should be within specified value and not

continue to drop (after a small amount) after pump

stops running.

Is fuel pressure at or between the specified value and

holding?

290 to 410

kPa

Go to Step 4 Go to Table

A-4.4 in this

Section

TABLE A-4.3 V6 PCM - FUEL DELIVERY SYSTEM

STEP ACTION VALUE YES NO

4. 1. Ignition "ON".

2. Enable output test with Tech 2 scan tool for fuel

pump and note fuel pressure.

3. Connect a hand vacuum pump to the fuel pressure

regulator vacuum fitting, and apply 38 cm Hg

of vacuum to the fuel pressure regulator.

4. Note fuel pressure with vacuum applied to

regulator.

When vacuum is applied, is fuel pressure at least specified

value difference then when no vacuum applied?

15 kPa Fuel supply

system OK.

Refit regulator

vacuum hose.

Go to Step 5

5. Replace fuel pressure regulator

Is repair complete ? Verify Repair

1. Fuel Pressure Too LOW or Too HIGH or

Pressure That Continues to Drop After The

Ignition is Turned OFF Can Cause The

Following Driveability Complaints:

• Poor Idle Quality

• Excessive Exhaust Odor

• Poor Fuel Economy

• Excessive Cranking Time

• Detonation

• Loss of Power

• DTC 44 or 64

• DTC 45 or 65

2. Fuel Rail

3. Fuel Injectors

4. Vacuum Hose Fitting

5. Fuel Pressure Regulator

6. Fuel Return Line

7. Fuel Pressure Gauge Connects Into This Line For

Testing

8. Fuel Feed (Pressure) Line

9. Fuel Filter

10. Fuel Tank

TABLE A-4.4 V6 PCM -