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Test Description

WARNING: This page is about a different car, the 2003 Saturn Vue. 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. 3:  This step tests the TCM and the wiring to the transmission.
  2. 5:  This step verifies that the circuit has the correct resistance.
DTC P0979

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS
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 Eng./Trans. DTC 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.
  5. Start the engine.
  6. Shift transmission into Drive.
  7. Select Shift Solenoid 3 CKT Status on the scan tool.
Does the scan tool display indicate a short to ground?		 - Go to Step 3  Go to INTERMITTENTS
3 
  1. Turn OFF the ignition.
  2. Disconnect the AT inline 14-way connector. Additional DTCs may set.
  3. Using the J-35616  GM terminal test kit, connect a test lamp between terminal 13 of the harness side of the AT inline 14-way connector and B+.
  4. Turn ON the ignition, with the engine OFF.
Is the test lamp ON?		 - Go to Step 4  Go to Step 5 
4 Test the control circuit (CKT 898) of the 1-2, 2-3, reverse shift solenoid (SS) valve (S3) for a short to ground between the TCM connector C2 and the AT inline 14-way connector.
Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
5 
  1. Turn OFF the ignition.
  2. Using the digital multimeter (DMM) and the J-35616  GM-approved terminal test kit measure the resistance between terminal 13 of the transmission side of the AT inline 14-way connector and ground.
Is the resistance within the specified range?		 8.4-22.6 ohm Go to Step 7  Go to Step 6 
6
  1. Leave the DMM test leads connected.
  2. Remove the control valve body cover.
  3. Disconnect the dark gray 1-way connector from the 1-2, 2-3, reverse SS valve (S3).
Is the resistance less than the specified value?		 100 ohm Go to Step 8  Go to Step 9 
7 Measure the resistance between terminal 13 and all other terminals of the transmission side of the AT inline 14-way connector.
Is the resistance between terminal 13 and any other terminal less than the specified value?		 100 ohm Go to Step 8  Go to INTERMITTENTS
8 Replace the automatic transmission wiring harness.
Refer to Wiring Harness Removal .
Did you complete the replacement?		 - Go to Step 11  -
9 Replace the 1-2, 2-3, reverse SS valve (S3).
Refer to Control Valve Body Assembly Disassemble .
Did you complete the replacement?		 - Go to Step 11  -
10 Replace the TCM.
Refer to Transmission Control Module (TCM) Replacement .
Did you complete the replacement?		 - Go to Step 11  -
11 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle.
  4. Select Specific DTC.
  5. Enter DTC P0979.

Does the DTC reset?		 - Go to Step 2  Go to Step 12 
12 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 DEFINITIONS System OK
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