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Test Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. 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. 2:  This step verifies that the fault is present.
  2. 3:  This step tests the transmission wiring harness and the PC solenoid valve for correct resistance.
  3. 9:  This step begins diagnosis of the engine side of the circuit.
DTC P0961 (3.6L)

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls in Engine Controls - 3.6L
2 
  1. Install a scan tool.
  2. Start the engine.
    3. IMPORTANT: Before clearing the DTCs, use the scan tool in order to record the Failure Records for reference. Using the Clear Info function will erase the stored Failure Records from the TCM.
  3. Record the Failure Records.
  4. Clear the DTCs.
  5. With the scan tool, command several values of solenoid reference current from 0.1 amp through 1.1 amp and observe the scan tool display.
Does the PC Sol. Actual Current reading vary from the PC Sol. Ref. Current reading by more than the specified amount?		 0.16 amp Go to Step 3  Go to Intermittent Conditions in Engine Controls - 3.6L
3 
  1. Turn OFF the ignition.
  2. Disconnect the transmission 20-way connector, additional DTCs may set.
  3. Connect the J 44152  jumper harness to the transmission side of the 20-way connector.
  4. Using the J 35616  GM terminal test kit, connect a DMM between the PC solenoid valve high control and low control circuits of the J 44152  .

    Refer to Automatic Transmission Inline 20-Way Connector End View (3.4L) or Automatic Transmission Inline 20-Way Connector End View (3.6L) .

  5. Measure the resistance of the PC solenoid valve.
Does the resistance measure within the specified range?		 3-7 ohm Go to Step 7  Go to Step 4 
4 Is the resistance greater than the specified value? 7 ohm Go to Step 5  Go to Step 6 
5
  1. Test the high control circuit of the PC solenoid valve for an open between the AT inline 20-way connector and the PC solenoid valve.
  2. Test the low control circuit of the PC solenoid valve for an open between the AT inline 20-way connector and the PC solenoid valve.
Refer to Testing for Continuity in Wiring Systems.Did you find the condition?		 - Go to Step 15  Go to Step 14 
6 Test the high control circuit and the low control circuit of the PC solenoid valve for a short together between the AT inline 20-way connector and the PC solenoid valve.
Refer to Circuit Testing in Wiring Systems.
Did you find the condition?		 - Go to Step 15  Go to Step 14 
7
  1. Test the high control circuit of the PC solenoid valve for a short to the transmission case between the AT inline 20-way connector and the PC solenoid valve.
  2. Test the high control circuit of the PC solenoid valve for a short to other power and ground circuits in the transmission harness. Test from the PC solenoid valve high control circuit to all other terminals in the transmission 20-way connector.
Refer to:Did you find the condition?		 - Go to Step 15  Go to Step 8 
8
  1. Test the low control circuit of the PC solenoid valve for a short to the transmission case between the AT inline 20-way connector and the PC solenoid valve.
  2. Test the low control circuit of the PC solenoid valve for a short to other power and ground circuits in the transmission harness. Test from the PC solenoid valve low control circuit to all other terminals in the transmission 20-way connector.
Refer to:Did you find the condition?		 - Go to Step 15  Go to Step 9 
9 
  1. Disconnect the J 44152  from the transmission side of the 20-way connector.
  2. Reconnect the 20-way connector.
  3. Disconnect the TCM connector.
  4. Using the DMM, measure the resistance between the PC solenoid valve high control and low control circuits at the TCM harness connector.
Does the resistance measure within the specified range?		 3-7 ohm Go to Step 13  Go to Step 10 
10 Does the resistance measure greater than the specified value? 7 ohm Go to Step 11  Go to Step 12 
11
  1. Test the high control circuit of the PC solenoid valve for an open between the TCM and the AT inline 20-way connector.
  2. Test the low control circuit of the PC solenoid valve for an open between the TCM and the AT inline 20-way connector.
Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 - Go to Step 17  -
12 Test the high control circuit and the low control circuit of the PC solenoid valve for a short together between the TCM and the AT inline 20-way connector.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 17  -
13
  1. Test the high control circuit of the PC solenoid valve for a short to ground or short to voltage between the TCM and the AT inline 20-way connector.
  2. Test the low control circuit of the PC solenoid valve for a short to ground or short to voltage between the TCM and the AT inline 20-way connector.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 - Go to Step 17  Go to Step 16 
14 Replace the pressure control solenoid valve.
Refer to Pressure Control Solenoid (PCS) Replacement .
Did you complete the replacement?		 - Go to Step 17  -
15 Replace the automatic transmission wiring harness assembly.
Refer to Wiring Harness Replacement .
Did you complete the replacement?		 - Go to Step 17  -
16 Replace the TCM.
Refer to Module, Transmission Control - Replace .
Did you complete the replacement?		 - Go to Step 17  -
17 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Start the engine.
  4. The PC solenoid valve actual current must be between 0.1 and 1.1 amp.
  5. Select Specific DTC.
  6. Enter DTC P0961.

Has the test run and passed?		 - Go to Step 18  Go to Step 2 
18 With a 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 in Engine Controls - 3.6L System OK
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