SECTION 6C2-2C - FUNCTIONAL CHECKS

CAUTION

This vehicle will be equipped with a Supplemental Restraint System (SRS). A SRS

will consist of either seat belt pre-ten sioners and a driv er’s side air bag, or seat b elt

pre-tensioners and a driver’s and front passenger’s side air bags. Refer to

CAUTIONS, Section 12M, before performing any service operation on or around SRS

components, the steering mechanism or wiring. Failure to follow the CAUTIONS

could result in SRS deployment, resulting in possible personal injury or

unnecessary SRS system repairs.

Use the following when there is a customer complaint and there are no diagnostic trouble codes set or one or more

of the Tech 2 Scan tool data values are not within the typical values. Before using these charts you should use the

symptoms charts which may lead you to using this Section.

The purpose of these charts are to diagnosis powertrain control module controlled components or

subsystems that do not have diagnostic trouble codes.

4L60E COMPONENT RESISTANCE CHART

COMPONENT TERMINAL WIRE

COLOUR PASS-

THROUGH

CONNECTOR

TERMINAL

RESISTANCE @

20 DEGREES C CIRCUIT

No.

1-2 SHIFT

SOLENOID A R E* 19 - 24 OHMS 339

B LG A 1222

2-3 SHIFT

SOLENOID A R E* 19 -24 OHMS 339

B Y B 1223

3-2 CONTROL

SOLENOID A R E* 20 - 24 OHMS 339

B W S 897

PRESSURE

CONTROL

SOLENOID

AV C 3 - 5 OHMS 1228

B LBLU D 1229

TRANSMISSION

FLUID

TEMPERATURE

SENSOR

A BR L 3088 - 3942

OHMS 1227

B GY M 469

TCC PWM

SOLENOID AR E*9 - 14 OHMS 339

B BR U 418

TCC ENABLE

SOLENOID R E 21 - 26 OHMS 339

B T 422

CHART 2.1 - AUTOMATIC TRANSMISSION WIRING

HARNESS ASSEMBLY CHECK

TOOLS REQUIRED:

J 39775 4L60-E Jumper Harness

J 39200 Digital Volt Multimeter (DVM)

J 35616 Connector Test Adapter Kit

IMPORTANT:

This procedure cannot be used for checking the Automatic Transmission Fluid Pressure Manual Valve Position

Switch (TFP Val. Position Sw.) circuit, or the Automatic Transmission Fluid Temperature (TFT) Sensor circuit. Refer

to the TFP Valve Position Switch Assembly Resistance Check, for those circuits.

CAVITY FUNCTION

A 1-2 SHIFT SOLENOID

B 2-3 SHIFT SOLENOID

C PRESSURE CONTROL SOLENOID

(HIGH)

D PRESSURE CONTROL SOLENOID

(LOW)

E 1-2 SHIFT SOLENOID, 2-3 SHIFT

SOLENOID, TCC ENABLE

SOLENOID, TCC PWM SOLENOID, 3-

2 CONTROL SOLENOID

L TRANS FLUID TEMPERATURE

(HIGH)

M TRANS FLUID TEMPERATURE

(LOW)

N RANGE SIGNAL A

P RANGE SIGNAL B

R RANGE SIGNAL C

S 3-2 CONTROL SOLENOID

T TCC ENABLE SOLENOID

U TCC PWM SOLENOID

STEP ACTION VALUE YES NO

11. Install the J 39775

Jumper Harness on

the transmission pass-

through connector.

2. Using a J 39200 DVM

and a J 35616

Connector Test

Adapter Kit, measure

the resistance between

terminals A and E (1-2

Shift Solenoid Valve).

Is the resistance within

the specified range?

19-24 W

@ 20° C

24-31W

@ 100°

Go to Step 3 Go to Step 2

21. Disconnect the 1-2

Shift Solenoid Valve

(1-2 SS Valve) from

the Automatic

Transmission Wiring

Harness Assembly.

2. Using the J 39200

DVM, measure the

resistance of the 1-2

SS Valve.

Is the resistance within

the specified range?

19-24 W

@ 20° C

24-31W

@ 100°

Go to Step 14 Go to Step 16

3Measure the resistance

between terminals B and

E (2-3 Shift Solenoid

Valve).

Is the resistance within

the specified range?

19-24 W

@ 20° C

24-31W

@ 100°

Go to Step 5 Go to Step 4

4Disconnect the 2-3 Shift

Solenoid Valve (2-3 SS

Valve) from the Automatic

Transmission Wiring

Harness Assembly.

Using the J 39200 DVM,

measure the resistance of

the 2-3 SS Valve.

Is the resistance within

the specified range?

19-24 W

@ 20° C

24-31W

@ 100°

Go to Step 14 Go to Step 16

5Measure the resistance

between terminals T and

E (Torque Converter

Clutch Solenoid Valve).

Is the resistance within

the specified range?

21-26 W

@ 20° C

26-33 W

@ 100°

Go to Step 6 Go to Step 14

6Measure the resistance

between terminals U and

E (Torque Converter

Clutch Pulse Width

Modulation Solenoid

Valve).

Is the resistance within

the specified range?

10-11 W

@ 20° C

13–15

@ 100°

Go to Step 8 Go to Step 7

STEP ACTION VALUE YES NO

71. Disconnect the TCC

PWM Sol. Valve from

the Automatic

Transmission Wiring

Harness Assembly.

2. Using the J 39200

DVM, measure the

resistance of the TCC

PWM Sol. Valve.

Is the resistance within

the specified range?

10-11 W

@ 20° C

13–15

@ 100°

Go to Step 14 Go to Step 16

8Measure the resistance

between terminals S and

E (3-2 Shift Solenoid

Valve assembly).

Is the resistance within

the specified range?

20-24 W

@ 20° C

29-32 W

@ 100°

Go to Step 10 Go to Step 9

91. Disconnect the 3-2

Shift Solenoid Valve

Assembly (3-2 SS

Valve Assembly.) from

the Automatic

Transmission Wiring

Harness Assembly.

2. Using the J 39200

DVM, measure the

resistance of the 3-2

SS Valve Assembly.

Is the resistance within

the specified range?

20-24 W

@ 20° C

29-32 W

@ 100°

Go to Step 14 Go to Step 16

10 Measure the resistance

between terminals C and

D (Pressure Control

Solenoid Valve).

Is the resistance within

the specified range?

3-5 W

@ 20° C

4-7 W

@ 100°

Go to Step 12 Go to Step 11

11 1. Disconnect the

Pressure Control

Solenoid Valve (PC

Sol. Valve) from the

Automatic

Transmission Wiring

Harness Assembly.

2. Using the J 39200

DVM, measure the

resistance of the PC

Sol. Valve.

Is the resistance within

the specified range?

3-5 W

@ 20° C

4-7 W

@ 100°

Go to Step 14 Go to Step 16

STEP ACTION VALUE YES NO

12 Using the J 39200 DVM

and the J 35616

Connector Test Adapter

Kit, measure the

resistance from each of

the terminals A, B, C, D,

E, S, T and U of the A/T

Wiring Harness

Assembly. at the

transmission pass-

through connector to the

transmission case .

Is the resistance more

than the specified value?

250k W System OK, exit

the table Go to Step 13

13 1. Disconnect the A/T

Wiring Harness

Assembly from all the

components.

2. Measure the

resistance from each

of the component

terminals to the

transmission case .

Is the resistance more

than the specified value?

250k W Go to Step 14 Go to Step 16

14 Inspect for high resistance

or a short.

Inspect the A/T Wiring

Harness Assembly. at the

transmission pass-

through connector, and

the component

connectors for the

following conditions:

• Poor electrical

connections

• Bent, backed-out, or

damaged terminals

• Weak terminal tension

• A chafed wire that

could short to bare

metal or other wiring

• A broken wire inside

the insulation

• Moisture intrusion

• Corrosion

If diagnosing for a

possible intermittent

condition, move or

massage the A/T Wiring

Harness Assembly. while

observing the test

equipment for a change.

Did you find and correct

the high resistance or a

short?

— Verify the repair

Go to Step 1 Go to Step 15

STEP ACTION VALUE YES NO

15 Replace the Automatic

Transmission Wiring

Harness Assembly. Refer

to the Service Operations

in Section 7C-5

AUTOMATIC

TRANSMISSION.

Is the action complete?

Verify the repair

Go to Step 1

16 Replace the faulty

component. Refer to

Service Operations in

Section 6C2-3.

Is the action complete?

Verify the repair

Go to Step 1

CHART 2.2 - TFP VALVE POSITION SWI TCH RESI STANCE CHECK

TOOLS REQUIRED:

J 39775 4L60E Jumper Harness

J 39200 Digital Volt Multimeter

J 35616 Connector Test Adapter Kit

IMPORTANT:

Whenever the transmission pass-through connector is disconnected and the engine is running, multiple DTCs will

set. Be sure to clear these codes when you are finished with this procedure.

IMPORTANT:

This procedure tests the Automatic Transmission Fluid Pressure Manual Valve Position Switch (TFP Val. Position

Sw.) circuits and the Automatic Transmission Fluid Temperature (TFT) Sensor circuit. Do not use this procedure to

test other Automatic Transmission circuits, refer to 4L60-E Automatic Transmission Internal Wiring Harness check.

STEP ACTION VALUE YES NO

11. Install the J 39775

Jumper Harness on

the transmission side

of the pass-through

connector.

2. Using the J 39200

DVM and the J 35616

Connector Test

Adapter Kit, measure

the resistance from

terminal N to the

transmission case .

Is the resistance greater

than the specified value?

50 k W Go to Step 3 Go to Step 2

21. Disconnect the TFP

Val. Position Sw. from

the A/T Wiring

Harness Assembly.

2. Measure the

resistance from

terminal C of the TFP

Val. Position Sw to the

switch housing.

Is the resistance greater

than the specified value?

50 k W Go to Step 16 Go to Step 19

3Measure the resistance

from terminal R to the

transmission case .

Is the resistance less than

the specified value?

200 W Go to Step 5 Go to Step 4

41. Disconnect the TFP

Val. Position Sw. from

the A/T Wiring

Harness Assembly.

2. Measure the

resistance from

terminal E of the TFP

Val. Position Sw. to the

switch housing.

Is the resistance less than

the specified value?

200 W Go to Step 16 Go to Step 19

5Measure the resistance

from terminal P to the

transmission case .

Is the resistance greater

than the specified value?

50 k W Go to Step 7 Go to Step 6

61. Disconnect the TFP

Val. Position Sw. from

the A/T Wiring

Harness Assembly.

2. Measure the

resistance from

terminal D of the TFP

Val. Position Sw. to the

switch housing.

Is the resistance greater

than the specified value?

50 k W Go to Step 16 Go to Step 19

STEP ACTION VALUE YES NO

71. Start the engine.

2. Allow the engine to

idle.

3. Set the parking brake.

4. Place the gear selector

in Reverse.

5. Measure the

resistance from

terminal N to the

transmission case .

Is the resistance less than

the specified value?

200 W Go to Step 8 Go to Step 16

81. Place the gear selector

in Low (D1).

2. Measure the

resistance from

terminal N to the

transmission case .

Is the resistance less than

the specified value?

200 W Go to Step 9 Go to Step 16

91. Place the gear selector

in Manual Third (D3).

2. Measure the

resistance from

terminal R to the

transmission case .

Is the resistance greater

than the specified value?

50 k W Go to Step 10 Go to Step 16

10 1. Place the gear selector

in Drive (D4).

2. Measure the

resistance from

terminal P to the

transmission case .

Is the resistance less than

the specified value?

200 W Go to Step 11 Go to Step 16

11 1. Place the gear selector

in Manual Second

(D2).

2. Measure the

resistance from

terminal P to the

transmission case .

Is the resistance greater

than the specified value?

50 k W Go to Step 12 Go to Step 16

STEP ACTION VALUE YES NO

12 1. Turn the ignition OFF.

IMPORTANT:

The resistance of the

TFT Sensor is

temperature

dependent, and

therefore varies more

than any other device.

2. Measure the

resistance from

terminal L to terminal

M (TFT Sensor) of the

Jumper Harness.

Is the resistance within

the specified range?

3088-

3942 W

@ 20° C

159-

198 W

@ 100°

Go to Step 13 Go to Step 14

13 1. Measure the

resistance from

terminal L to the

transmission case .

2. Measure the

resistance from

terminal M to the

transmission case .

Are both resistance’s

greater than the specified

value?

10 M W No problem

found. Exit the

table.

Go to Step 14

14 1. Disconnect the TFP

Val. Position Sw. from

the A/T Wiring

Harness Assembly.

IMPORTANT:

The resistance of the

TFT Sensor is

temperature

dependent, and

therefore varies far

more than any other

device. Refer to

Transmission Fluid

Temperature Sensor in

General Information.

2. Using the J 39200

DVM, measure the

resistance between

terminal A and terminal

B of the TFP Val.

Position Sw. (TFT

Sensor).

Is the resistance within

the specified range?

3088–

3942 W

@ 20°

159-

198 W

@ 100°

Go to Step 15 Go to Step 19

STEP ACTION VALUE YES NO

15 1. Measure the

resistance from TFP

Val. Position Sw.

terminal A to the

transmission case .

2. Measure the

resistance from TFP

Val. Position Sw.

terminal B to the

transmission case .

Are both resistances

greater than the specified

value?

10 M W Go to Step 16 Go to Step 19

16 1. Inspect for high

resistance or a short.

2. Inspect the A/T Wiring

Harness Assembly. for

poor electrical

connections at the A/T

pass-through

connector, and at the

TFP Val. Position

Switch. Check for the

following problems:

• A bent terminal

• A backed out

terminal

• A damaged

terminal

• Poor terminal

tension

3. If diagnosing for an

intermittent problem,

massage the wiring

harness while watching

the test equipment for

a change.

Did you find and correct

the high resistance or a

short?

Verify the repair

Go to Step 1 Go to Step 17

17 1. Disconnect the TFP

Val. Position Sw. from

the A/T Wiring

Harness Assembly.

2. Inspect the following

circuits for an open or

short:

• Circuit 1224

• Circuit 1225

• Circuit 1226

• Circuit 1227 (TFT

Hi)

• Circuit 469 (TFT

Lo)

Did you find a problem?

Go to Step 18 Go to Step 19

STEP ACTION VALUE YES NO

18 Replace the A/T Wiring

Harness Assembly.

Refer to Automatic

Transmission Wiring

Harness Assembly

Replacement, in Service

Operations in Section 7C-

5 AUTOMATIC

TRANSMISSION.

Is the action complete?

Verify the repair

Go to Step 1

19 Replace the TFP Val.

Position Sw.

Refer to Automatic

Transmission Fluid

Pressure Manual Valve

Position Switch

Replacement. Refer to

Service Operations, in

Section 6C2-3.

Is the action complete?

Verify the repair

Go to Step 1

CHART 2.3 - 1-2 SHIFT SOLENOID PERFORMANCE CHECK

CIRCUIT DESCRIPTION

The 1-2 Shift Solenoid Valve (1-2 SS Valve) controls the fluid flow acting on the 1-2 and 3-4 shift valves. The 1-2 SS

Valve is a normally open valve that is used with the 2-3 Shift Solenoid Valve (2-3 SS Valve), in order to allow four

different shifting combinations.

This functional check is useful for diagnosing unusual shift patterns that result from a mechanical fault of the 1-2

shift solenoid or the shift valve. A 1-1-4-4 shift pattern indicates that the shift solenoid or the shift valve is stuck ON.

The stuck ON condition could be caused by the solenoid not exhausting the fluid or the shift valve remaining in the

applied position. Similarly, a 2-2-3-3 shift pattern indicates that the shift solenoid or the shift valve is stuck OFF. The

stuck OFF condition could be caused by the solenoid exhausting fluid or the shift valve remaining in the non-applied

position.

TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic chart.

3. This step tests that the scan tool commanded all the shifts and all the shift solenoid valves responded correctly,

but all the shifts did not occur. Refer to the chart below.

DIAGNOSTIC AIDS:

• Verify that the transmission shift speeds are within the specifications.

• Other internal transmission faults may cause more than one shift to occur.

• Refer to the following chart for the correct On and Off states of the shift solenoids.

GEAR 1-2 SHIFT

SOLENOID 2-3 SHIFT

SOLENOID

1ON ON

2OFF ON

3OFF OFF

4ON OFF

STEP ACTION VALUE YES NO

1Was the On-Board

Diagnostic (OBD) System

Check performed?

Go to Step 2 Go to OBD

System Check

21. Install the scan tool.

2. With the engine OFF,

turn the ignition switch

to the RUN position.

3. While the engine is

operating, raise the

drive wheels.

4. With the transmission

in D4 range, use the

scan tool to command

1st, 2nd, 3rd and 4th

gears while

accelerating the

vehicle. Road testing

the vehicle may be

necessary.

Did you detect a 1-1-4-4

or a 2-2-3-3 only shift

pattern?

Go to Step 3 Go to “Diagnostic

Aids” above

3Check the shift

solenoid/hydraulic circuit

for:

• An internal

malfunction.

• Damaged seals on the

shift solenoid valves.

Refer to the symptom

diagnosis charts.

Did you find and correct

the problem?

Go to Step 4 Go to “Diagnostic

Aids” above

4In order to verify your

repair, perform the

following procedure:

1. Select DTC.

2. Select Clear Info.

3. Operate the vehicle

under the following

conditions (only if

traffic and road

conditions permit):

• With the

transmission in the

D4 range, use the

scan tool to

command the 1st,

2nd, 3rd and 4th

gears while

accelerating the

vehicle.

Did you detect a 1-1-4-4

or 2-2-3-3 only shift

pattern?

Begin the

diagnosis again.

Go to Step 1

Repair Verified,

exit table

CHART 2.4 - 2-31-2 SHIFT SOLENOID PERFORMANCE CHECK 3

CIRCUIT DESCRIPTION

The 2-3 Shift Solenoid Valve (2-3 SS Valve) controls the fluid flow acting on the 2-3 shift valves. The 2-3 SS Valve

is a normally open exhaust valve that is used with the 1-2 Shift Solenoid Valve (1-2 SS Valve) in order to allow four

different shifting combinations.

This functional check is useful for diagnosing unusual shift patterns that result from a mechanical fault of the 2-3

shift solenoid or the shift valve. A 1-2-2-1 shift pattern indicates that the shift solenoid or the shift valve is stuck ON.

The stuck ON condition could be caused by the solenoid not exhausting fluid or the shift valve remaining in the

applied position. Similarly, a 4-3-3-4 shift pattern indicates that the shift solenoid or the shift valve is stuck OFF.

The stuck OFF condition could be caused by the solenoid exhausting fluid or the shift valve remaining in the non-

applied position.

TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic chart.

3. This verifies that the scan tool commanded all the shifts, and all the shift solenoids responded correctly, but all

the shifts did not occur. Refer to the chart below.

DIAGNOSTIC AIDS:

• Verify that the transmission shift speeds are within the specifications.

• Other internal transmission faults may cause more than one shift to occur.

• Refer to the following chart for the correct On and Off states of the shift solenoids.

GEAR 1-2 SHIFT

SOLENOID 2-3 SHIFT

SOLENOID

1ON ON

2OFF ON

3OFF OFF

4ON OFF

STEP ACTION VALUE YES NO

1Was the On Board

Diagnostic (OBD) System

Check performed?

Go to Step 2 Go to OBD

System Check

21. Install the scan tool.

2. With the engine OFF,

turn the ignition switch

to the RUN position.

3. While the engine is

operating, raise the

drive wheels.

4. With the transmission

in D4 range, use the

scan tool to command

1st, 2nd, 3rd, and 4th

gears while

accelerating the

vehicle. Road testing

the vehicle may be

necessary.

Did you detect a 1-2-2-1

or 4-3-3-4 only shift

pattern?

Go to Step 3 Go to “Diagnostic

Aids” above

3Check the shift

solenoid/hydraulic circuit

for

• An internal malfunction

• Damaged seals

Refer to the symptom

diagnosis charts

Did you find and correct a

problem?

Go to Step 4 Go to “Diagnostic

Aids” above

4In order to verify your

repair, perform the

following procedure:

1. Select DTC.

2. Select Clear Info.

3. Operate the vehicle

under the following

conditions (only if

traffic and road

conditions permit):

• With the transmission

in D4 range, use the

scan tool to command

1st, 2nd, 3rd and 4th

gears while

accelerating the

vehicle.

Did you detect a 1-2-2-1

or a 4-3-3-4 only shift

pattern?

Begin the

diagnosis again

Go to Step 1

Repair Verified,

exit table

CHART 2.5 - TRANSMISSION ECONOM Y/POWER SWITCH

CIRCUIT DESCRIPTION

The driver can select two transmission shift modes, "ECONOMY" or "POWER" using a dash or center console

mounted switch. This switch is wired to the PCM and allows the driver to choose the "Economy" mode, for the best

fuel economy in all driving conditions through the increased use of TCC, or the "Power" mode which provides later

upshifts and higher line pressure in the transmission.

The PCM sends out a buffered voltage signal, about 12 volts, and monitors the status of this circuit. In the

"Economy" position, the switch is open and the PCM voltage status signal remains high at about 12 volts. The PCM

does not allow shift point changes with this condition. When the transmission switch is pressed to "Power", the

switch is closed and the PCM voltage status signal is pulled low, to about 0.5 volts. The PCM senses this voltage

drop on circuit 774 and enables power mode shifting only if other criteria such as throttle position, engine load and

engine speed are met.

TEST DESCRIPTION:

The numbers below refer to step numbers on the diagnostic chart.

2. This tests for the proper operation of the transmission POWER switch, the wiring and the PCM.

3. This tests for the proper POWER lamp illumination, when the power switch is On.

4. This tests for a shorted power switch or a short to earth on circuit 774.

5. This tests for an open in the bulb circuit.

10. Some interior parts must be removed to disconnect the transmission switch, refer to

Section 7C-4 AUTOMATIC TRANSMISSION - ON VEHICLE SERVICING. This step simulates a closed

switch if the earth circuit is OK.

STEP ACTION VALUE YES NO

1Was the On-Board

Diagnostic (OBD) System

Check performed?

Go to Step 2 Go to OBD

System Check

21. With the engine OFF,

turn the ignition switch

to the RUN position.

2. Install the scan tool.

3. Place the

Transmission POWER

switch in the POWER

position and observe

the scan tool display.

Does the scan tool display

POWER?

Go to Step 3 Go to Step 10

3Is the POWER lamp ON,

when the scan tool

displays POWER?

Go to Step 4 Go to Step 5

4Place the Transmission

POWER switch in the

ECONOMY position and

observe the scan tool

display.

Does the scan tool display

ECONOMY?

Go to Step 6 Go to Step 7

5Check for an open in the

POWER lamp bulb, or the

bulb feed circuit.

Is the Action Complete?

Verify the Repair

6Does the POWER lamp

go off, when the scan tool

displays ECONOMY?

No Trouble

Found.

ECONOMY/

POWER switch

electrically OK.

Refer to Section

6C2-2B

SYMPTOMS

"Intermittents”.

Go to Step 8

7Disconnect the POWER

switch from the wiring

harness connector.

Does the scan tool display

ECONOMY?

Go to Step 12 Go to Step 9

8Check for a short to earth

on the POWER lamp

circuit in the instrument

panel cluster.

Is the action complete?

Verify the Repair

9Check for a short to earth

in circuit 774.

Did you find and correct

the short to earth

condition?

Verify the Repair Go to Step 16

STEP ACTION VALUE YES NO

10 1. Disconnect the

POWER switch from

the wiring harness

connector.

2. Using a fused jumper

wire, connect the two

terminals of the

POWER switch wiring

harness connector

together.

Does the scan tool display

POWER?

Go to Step 12 Go to Step 11

11 Using a fused jumper

wire, connect circuit 774

to earth.

Does the scan tool display

POWER?

Go to Step 15 Go to Step 14

12 Check the POWER switch

connector for a shorted or

a loose terminal

connection.

Did you find and correct

the faulty condition?

Verify the Repair Go to Step 13

13 Replace the faulty

POWER switch.

Is the action complete?

Verify the Repair

14 Check for an open circuit

or a faulty PCM

connection on circuit 774.

Did you find and correct

the open circuit?

Verify the Repair Go to Step 16

15 Repair the open in circuit

151 to earth.

Is the action complete?

Verify the Repair

16 Replace the faulty PCM.

Refer to Section 6C2-3

Service Operations for the

Security Link procedure.

Is the action complete?

Verify the Repair