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Home › Hummer › 2009 › H3 Base, Automatic › Repair and Diagnosis › Transmission › Automatic Trans › Automatic Transmission - DTC P0218 To DTC P2771 › DTC P0961 › Circuit/System Testing

Circuit/System Testing

  1. Disconnect the AT inline 20-way connector. Install the J 44152  jumper harness (20 pins), on the transmission side on the connector. See Special Tools . Using the J 35616  GM-approved terminal test kit, measure the resistance between the PC solenoid high control circuit and the PC solenoid low control circuit. The resistance should be between 3-7 ohms.
    • If the resistance is greater than 7 ohms, test the PC solenoid high control circuit or the PC solenoid low control circuit for an open or a faulty PC solenoid valve.
    • If the resistance is less than 3 ohms, test for the PC solenoid high control circuit and the PC solenoid low control circuit shorted together of a faulty PC solenoid valve.
  2. Measure the resistance between the PC solenoid high control circuit and the transmission case. Measure the resistance between the PC solenoid low control circuit and the transmission case. The resistance should be greater than 250K ohms.
    • If the resistance is less than 250K ohms, replace the automatic transmission wiring harness assembly.
  3. Measure the resistance between the PC solenoid high control circuit and all other circuits of the J 44152  except the PC solenoid low control circuit. See Special Tools . Measure the resistance between the PC solenoid low control circuit and all other circuits of the J 44152  except the PC solenoid high control circuit. See Special Tools . The resistance should be greater than 250K ohms.
    • If the resistance is less than 250K ohms, replace the automatic transmission wiring harness assembly.
  4. Remove the J 44152  from the transmission side and install on the engine side of the harness. See Special Tools . Disconnect the TCM connector. Using the J 35616  , measure the resistance of the PC solenoid high control circuit between the TCM connector and the AT inline 20-way connector. Measure the resistance of the PC solenoid low control circuit between the TCM connector and the AT inline 20-way connector. The resistance should be less than 250 ohms for each circuit.
    • If the value is greater than 250 ohms, repair the open in the affected circuit.
  5. Measure the resistance between the PC solenoid high control circuit and ground. Measure the resistance between the PC solenoid low control circuit and ground. The resistance for each circuit should be greater than 250K ohms.
    • If the value is less than 250K ohms, repair the short to ground in the affected circuit.
  6. Reconnect the TCM connector. Turn ON the ignition with the engine OFF. Test the PC solenoid high control circuit and the PC solenoid low control circuit for a short to voltage.
    • If a short to voltage condition is found, repair as necessary.
    • If all circuits/connections test normal, test or replace the PC solenoid valve.
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