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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 938 (Automatic Transmission - ALLISON - DTC P0733 To DTC P0873) >> DTC P0762 >> Test Description

Test Description

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

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

  1. 5:  This step tests the TCM response function.
  2. 6:  This step tests the transmission wiring harness integrity.
  3. 7:  This step tests and evaluates the internal wiring harness.
  4. 8:  This step tests the PSM for a failed condition.
DTC P0762

Step Action Yes No
Schematic Reference: Automatic Transmission Controls Schematics
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Measure the transmission fluid level. Refer to Transmission Fluid Check .
Is the transmission fluid level correct?		 Go to Step 3  Go to Transmission Fluid Check
3 Measure the line pressure. Refer to Line Pressure Check .
Is the pressure within the specified value?		 Go to Step 4  Go to Symptoms - Automatic Transmission
4
  1. Install the 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 for reference. The Clear Info function will erase the data.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Start the engine.
  6. Using the scan tool, monitor PS3 status.
Does the scan tool indicate PS3 status is ON?		 Go to Diagnostic Aids Go to Step 5 
5 
  1. Turn the ignition OFF.
  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.
  4. Turn ON the ignition, with the engine OFF.
  5. Using the J 35616  GM terminal test kit and a fused jumper wire, connect terminal E of the J 44152  to ground. Refer to Automatic Transmission Inline Harness Connector End View .
Does the scan tool indicate PS3 status is LOW when grounded and HIGH when open?		 Go to Step 6  Go to Step 14 
6 
  1. Turn the ignition OFF.
  2. Disconnect the 80-way connector at the TCM.
  3. Install the J 39700  breakout box, the J-47275  breakout box adapter and the J 47275-1 magnetic overlay.
  4. Turn ON the ignition, with the engine OFF.
  5. Connect terminal 57 to a known good ground.
Does the scan tool indicate PS3 status is LOW when grounded and HIGH when open?		 Go to Step 7  Go to Step 15 
7 
  1. Connect the AT inline 20-way connector.
  2. Remove the transmission oil pan. Refer to Oil Pan Replacement .
  3. Disconnect the AT internal wiring harness from the PSM and ground terminal C.
Does the scan tool indicate PS3 status is LOW when grounded and HIGH when open?		 Go to Step 8  Go to Step 13 
8 
  1. Remove the PSM from the control valve body and leave the internal harness connected. Refer to Pressure Switch Manifold Replacement .
  2. Provide a ground connection for the PSM to either the control valve body or the transmission main case.
  3. Using the eraser end of a pencil, push gently on the PS3 membrane.
Does the scan tool indicate PS3 status is LOW when grounded and HIGH when open?		 Go to Step 9  Go to Step 12 
9 Remove the control valve body and inspect for a stuck or sticking SS3. Refer to Control Valve Body Assembly Disassemble .
Was the SS3 stuck or sticking?		 Go to Step 11  Go to Step 10 
10 Replace the SS3 and install the control valve body. Refer to Control Valve Body Replacement .
Did you replace the solenoid and install the valve body?		 Go to Step 16  -
11 Clean and/or polish the sticking valve in order to restore free movement or replace the control valve body assembly. Refer to Control Valve Body Cleaning and Inspection .
Did you restore free movement or replace the valve body?		 Go to Step 16  -
12 Replace the PSM. Refer to Pressure Switch Manifold Replacement .
Did you complete the replacement?		 Go to Step 16  -
13 Replace the AT internal wiring harness. Refer to Wiring Harness Replacement .
Did you complete the replacement?		 Go to Step 16  -
14 Test the PS3 circuit between the TCM and AT inline 20-way connector for an open or short condition. Refer to Circuit Testing .
Did you find and correct the condition?		 Go to Step 16  -
15
IMPORTANT: Prior to replacing the TCM, swap the TCM with a known good TCM. In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM.
Replace the TCM. Refer to Control Module References for replacement, setup, and programming.Did you complete the replacement?		 Go to Step 16  -
16 Perform the following procedure in order to verify the repair:
  1. Clear the DTC.
  2. Start the engine.
  3. Using the scan tool, monitor the PS3 status.
  4. Select Specific DTC.
  5. Enter DTC P0762.

Has the test run and passed?		 Go to Step 17  Go to Step 2 
17 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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