GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1996 🢒 Tahoe - 4WD 🢒 Engine 🢒 Engine Controls - 5.0L, 5.7L, and 7.4L 🢒 Automatic Transmission Internal Wiring Harness Check

Test Description

Tools Required

    • J 39775 4L60-E Jumper Harness
    • J 39200 Digital Multimeter
    • J 35616-A 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 Pressure Switch Assembly Resistance Check , for those circuits.

4L60-E (all applications) Automatic Transmission Wiring Harness Assembly Check

Step

Action

Value(s)

Yes

No

1
  1. Install the J 39775 Jumper Harness on the transmission 20-way connector.
  2. Using a J 39200 DVOM and a J 35616-A Connector Test Adapter Kit, measure the resistance between terminals A and E (1-2 Shift Solenoid Valve).

Is the resistance within the specified range?

19-24ohms @ 20°C (68°F)

24-31ohms @ 100°C (212°F)

Go to Step 3

Go to Step 2

2
  1. Disconnect the 1-2 Shift Solenoid Valve (1-2 SS Valve) from the Automatic Transmission Wiring Harness Assembly.
  2. Using the J 39200 DVOM, measure the resistance of the 1-2 SS Valve.

Is the resistance within the specified range?

19-24ohms @ 20°C (68°F)

24-31ohms @ 100°C (212°F)

Go to Step 14

Go to Step 16

3

Measure the resistance between terminals B and E (2-3 Shift Solenoid Valve).

Is the resistance within the specified range?

19-24ohms @ 20°C (68°F)

24-31ohms @ 100°C (212°F)

Go to Step 5

Go to Step 4

4
  1. Disconnect the 2-3 Shift Solenoid Valve (2-3 SS Valve) from the Automatic Transmission Wiring Harness Assembly.
  2. Using the J 39200 DVOM, measure the resistance of the 2-3 SS Valve.

Is the resistance within the specified range?

19-24ohms @ 20°C (68°F)

24-31ohms @ 100°C (212°F)

Go to Step 14

Go to Step 16

5

Measure the resistance between terminals T and E (Torque Converter Clutch Solenoid Valve).

Is the resistance within the specified range?

21-26ohms @ 20°C (68°F)

26-33ohms @ 100°C (212°F)

Go to Step 6

Go to Step 14

6

Measure the resistance between terminals U and E (Torque Converter Clutch Pulse Width Modulation Solenoid Valve).

Is the resistance within the specified range?

10-11ohms @ 20°C (68°F)

13-15ohms @ 100°C (212°F)

Go to Step 8

Go to Step 7

7
  1. Disconnect the TCC PWM Sol. Valve from the Automatic Transmission Wiring Harness Assembly.
  2. Using the J 39200 DVOM, measure the resistance of the TCC PWM Sol. Valve.

Is the resistance within the specified range?

10-11ohms @ 20°C (68°F)

13-15ohms @ 100°C (212°F)

Go to Step 14

Go to Step 16

8

Measure the resistance between terminals S and E (3-2 Shift Solenoid Valve assembly).

Is the resistance within the specified range?

20-24ohms @ 20°C (68°F)

29-32ohms @ 100°C (212°F)

Go to Step 10

Go to Step 9

9
  1. Disconnect the 3-2 Shift Solenoid Valve assembly (3-2 SS Valve Assy.) from the Automatic Transmission Wiring Harness Assembly.
  2. Using the J 39200 DVOM, measure the resistance of the 3-2 SS Valve Assy.

Is the resistance within the specified range?

20-24ohms @ 20°C (68°F)

29-32ohms @ 100°C (212°F)

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?

3-5ohms @ 20°C (68°F)

4-7ohms @ 100°C (212°F)

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 DVOM, measure the resistance of the PC Sol. Valve.

Is the resistance within the specified range?

3-5ohms @ 20°C (68°F)

4-7ohms @ 100°C (212°F)

Go to Step 14

Go to Step 16

12

Using the J 39200 DVOM and the J 35616-A Connector Test Adapter Kit, measure the resistance from terminals A, B, C, D, E, S, T, and U of the A/T Wiring Harness Assy. at the transmission 20-way connector to the transmission case.

Is the resistance more than the specified value?

250kohms

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 all the component terminals to the transmission case.

Is the resistance more than the specified value?

250kohms

Go to Step 14

Go to Step 16

14

Inspect for high resistance or a short.

    • Inspect the A/T Wiring Harness Assy. at the transmission 20-way 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
    • If diagnosing for a possible intermittent condition, move or massage the A/T Wiring Harness Assy. while observing the test equipment for a change.

Did you find a high resistance or a short?

--

Verify the repair. Go to Step 1

Go to Step 15

15

Replace the Automatic Transmission Wiring Harness Assembly.

Is the replacement complete?

--

Verify the repair. Go to Step 1

--

16

Replace the faulty component.

Is the replacement complete?

--

Verify the repair. Go to Step 1

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