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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 146 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0973 To DTC P2771) >> DTC P2764 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 4:  This step tests for voltage to the solenoid.
  2. 5:  This step tests the ability of the TCM and wiring to control the ground circuit.
  3. 7:  This step tests the resistance of the TCC PWM solenoid valve and the automatic transmission (AT) wiring harness.
DTC P2764

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
    3. IMPORTANT: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the TCM.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
Are any of the following DTCs also set?
  • P0787
  • P0973
  • P0976
  • P2769
 - Go to Step 3  Go to Step 4 
3 Inspect the ignition voltage supply fuse for an open.
Refer to Circuit Protection - Fuses .
Is the fuse open?		 - Go to Step 11  Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Disconnect the AT inline 20-way connector, additional DTCs may set.
  3. Install the J 44152  Jumper Harness (20 pins) on the engine side of the AT inline 20-way connector. See Special Tools .
  4. Turn ON the ignition, with the engine OFF.
  5. Using the J 35616  GM Terminal Test Kit, connect a test lamp from the TCC PWM ignition voltage circuit of the J 44152  to ground. See Special Tools .
Refer to Automatic Transmission Inline 20-Way Connector End View .Does the test lamp illuminate?		 - Go to Step 5  Go to Step 14 
5 
  1. Connect the test lamp between the TCC PWM solenoid valve ignition voltage and control circuits of the J 44152  . See Special Tools .

    Refer to Automatic Transmission Inline 20-Way Connector End View .

  2. Use the scan tool in order to command the TCC PWM solenoid valve ON and OFF three times.
Does the test lamp turn ON and OFF with each command?		 - Go to Step 7  Go to Step 6 
6 Is the test lamp always ON? - Go to Step 15  Go to Step 16 
7 
  1. Install the J 44152  on the transmission side of the AT inline 20-way connector. See Special Tools .
  2. Using the DMM and the J 35616  , measure the resistance between the TCC PWM solenoid valve ignition voltage and control circuits of the J 44152  . See Special Tools .

    Refer to Testing for Continuity .

Refer to Automatic Transmission Inline 20-Way Connector End View .Does the resistance measure within the specified range?		 10-15 Ω Go to Step 8  Go to Step 9 
8 Measure the resistance from the TCC PWM solenoid valve ignition voltage and control circuits to ground.
Refer to Testing for Continuity .
Do both readings measure greater than the specified value?		 250 K Ω Go to Testing for Intermittent Conditions and Poor Connections Go to Step 10 
9
  1. Disconnect the AT wiring harness from the TCC PWM solenoid valve.
  2. Measure the resistance of the TCC PWM solenoid valve.
Refer to Testing for Continuity .Does the resistance measure within the specified range?		 10-15 Ω Go to Step 17  Go to Step 18 
10
  1. Disconnect the AT wiring harness assembly from the TCC PWM solenoid valve.
  2. Measure the resistance from each of the component terminals to ground.
Refer to Testing for Continuity .Do both readings measure greater than the specified value?		 250 K Ω Go to Step 17  Go to Step 18 
11
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution.
Test the ignition circuit of the TCC PWM solenoid valve for a short to ground between the fuse block and the AT inline 20-way connector.Refer to Testing for Short to Ground and Wiring Repairs .Did you find and correct the condition?		 - Go to Step 20  Go to Step 12 
12
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution.
Test the ignition circuit of the TCC PWM solenoid valve for a short to ground between the AT inline 20-way connector and the TCC PWM solenoid valve.Refer to Testing for Short to Ground .Did you find a short to ground condition?		 - Go to Step 17  Go to Step 13 
13
  1. Test each solenoid for a short to ground.
  2. Replace the faulty solenoid as necessary.
Did you complete the replacement?		 - Go to Step 20  -
14
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution.
Test the ignition circuit of the TCC PWM solenoid valve for an open.Refer to Testing for Continuity and Wiring Repairs .Did you find and correct the condition?		 - Go to Step 20  -
15 Test the control circuit of the TCC PWM solenoid valve for a short to ground between the TCM and the AT inline 20-way connector.
Refer to Testing for Short to Ground and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 20  Go to Step 19 
16 Test the control circuit of the TCC PWM solenoid valve for an open between the TCM and the AT inline 20-way connector.
Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 20  Go to Step 19 
17 Replace the AT wiring harness.
Refer to Torque Converter Clutch Pulse Width Modulation Solenoid, Torque Converter Clutch Solenoid, and Wiring Harness .
Did you complete the replacement?		 - Go to Step 20  -
18 Replace the TCC PWM solenoid valve.
Refer to Torque Converter Clutch Pulse Width Modulation Solenoid, Torque Converter Clutch Solenoid, and Wiring Harness .
Did you complete the replacement?		 - Go to Step 20  -
19 Replace the TCM.
Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 20  -
20 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Drive the vehicle in D4 with the TCC ON and ensure that the TCC Duty Cycle CKT status parameter displays OK for 5 seconds.
  4. Select Specific DTC.
  5. Enter DTC P2764.

Has the test run and passed?		 - Go to Step 21  Go to Step 2 
21 With the scan tool, observe the stored information, capture info, and DTC Info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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