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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 P0973, P0976, or P2764 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Inspect the TRANS fuse for an open.
    • If the fuse is open, test the ignition 1 voltage circuit and the affected control circuit for a short to ground between the fuse block-underhood and the automatic transmission inline 20-way connector.
  2. Disconnect the automatic transmission inline 20-way connector. Connect the J 44152  jumper harness (20 pins) to the engine side of the connector. Using the J 35616  GM terminal test kit, connect a test lamp between the ignition 1 voltage circuit and the affected control circuit. Turn ON the ignition, with the engine OFF. Using the scan tool output controls, command the affected solenoid ON and OFF. The test lamp should blink ON and OFF as commanded. See Special Tools .
    • If the test lamp is always OFF, test the circuits for an open.
  3. Connect the J 44152  to the transmission side of the connector. Using the J 35616  , measure the resistance between the ignition 1 voltage circuit and the affected control 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 resistance is greater than the specified range, test the circuits for an open. If resistance is less than the specified range, test for a faulty solenoid or a shorted together condition.
  4. Measure the resistance between the ignition 1 voltage circuit and the transmission case. The resistance should be greater than 10K ohms.
    • If the resistance is less than 10K ohms, test the ignition 1 voltage circuit for a short to ground.
  5. Measure the resistance between the affected control circuit and ground. The resistance should be greater than 10K ohms.
    • If the resistance is greater than 10K ohms, test the affected control circuit for a short to ground.
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