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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Automatic Transmission - 4T65-E - DTC PO218 Through DTC P2534) >> DTC P0974, P0977, or P2763 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Disconnect the automatic transmission inline 20-way connector. Install the J 44152  jumper harness (20 pins) on the engine side of the automatic transmission inline 20-way connector. Using the J 35616  GM terminal test kit, connect a test lamp between the affected control circuit and ground. Turn ON the ignition, with the engine OFF. The test lamp should be OFF. See Special Tools .
    • If the test lamp is ON, test the affected control circuit for a short to voltage between the fuse block-underhood and the automatic transmission inline 20-way connector.
  2. Disconnect the J 44152  from the engine harness. Connect the J 44152  to the transmission side of the automatic transmission inline 20-way connector. Using the J 35616  , measure the resistance between the affected control circuit and the ignition 1 voltage circuit. Resistance should be between 19-31 ohms for the 1-2 SS and the 2-3 SS. Resistance should be between 10-15 ohms for the TCC PWM solenoid valve. See Special Tools .
    • If the resistance is less than the specified value, test for a short to the ignition 1 voltage circuit or a faulty solenoid.
  3. Using the J 35616  , measure the resistance between the affected control circuit and all other circuits in the J 44152  , except the ignition 1 voltage circuit and the other control circuits. Resistance should be greater than 10 ohms. See Special Tools .
    • If resistance is less than 10 ohms, test the control circuit for a short to another circuit.
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