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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1047 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P2771) >> DTC P0974, P0977, or P2763 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra and 2008 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the AT inline 20-way connector. Install the J 44152  jumper harness (20 Pins), on the engine side of the AT inline 20-way connector. See Special Tools . Using the J 35616  GM-approved 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.
    • If the test lamp is ON, test the affected control circuit for a short to voltage between the Fuse Block-Underhood and the AT inline 20-way connector.
  2. Disconnect the J 44152  from the engine harness. See Special Tools . Connect the J 44152  to the transmission side of the AT inline 20-way connector. See Special Tools . Using theJ 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.
    • 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. See Special Tools . Resistance should be greater than 250K ohms.
    • If resistance is less than 250K ohms, test the control circuit for a short to another circuit.
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