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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1993 (Automatic Transmission - 4T45-E - DTC P0218 To DTC P0961) >> DTC P0961 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Additional DTCs may set when disconnecting the automatic transmission inline 20-way connector.
  1. Disconnect the AT inline 20-way connector. Install the J 44152  on the transmission side on the connector. Using a terminal test kit, measure the resistance between the PC solenoid high control circuit terminal C and the PC solenoid low control circuit terminal D. 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 terminal C and the transmission case. Measure the resistance between the PC solenoid low control circuit terminal D and the transmission case. The resistance should be greater than 10K ohms.
    • If the resistance is less than 10K ohms, replace the automatic transmission wiring harness assembly.
  3. Measure the resistance between the PC solenoid high control circuit terminal C and all other circuits of the J 44152  except the PC solenoid low control circuit. Measure the resistance between the PC solenoid low control circuit terminal D and all other circuits of the J 44152  except the PC solenoid high control circuit. The resistance should be greater than 10K ohms.
    • If the resistance is less than 10K 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. Disconnect the TCM connector. Using a terminal test kit, measure the resistance of the PC solenoid high control circuit terminal 40 between the TCM connector and the AT inline 20-way connector terminal C. Measure the resistance of the PC solenoid low control circuit between the TCM connector and the AT inline 20-way connector terminal D. The resistance should be less than 10 ohms for each circuit.
    • If the value is greater than 10 ohms, repair the open in the affected circuit.
  5. Measure the resistance between the PC solenoid high control circuit terminal 40 and ground. Measure the resistance between the PC solenoid low control circuit terminal 17 and ground. The resistance for each circuit should be greater than 10K ohms.
    • If the value is less than 10K 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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