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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the transmission X176 24-way connector. Ignition ON. The scan tool IMS Status parameter should display HI for the R1, R2, D1, D2 and S signal circuit displays.
    • If a signal displays LOW, disconnect the PIM connector X1 and test the circuit for a short to ground.
    • If the circuit tests normal, replace the PIM.
  2. Install DT-48493  to the vehicle harness connector X176. See Special Tools . Verify that a test lamp illuminates between the Direction IMS switch ground circuit and battery positive.
    • If the test lamp does not illuminate, disconnect PIM connector X1 and test the ground circuit for an open, high resistance or short to voltage condition.
    • If the circuit tests normal, replace the PIM.
  3. Connect a 3-amp fused jumper wire between each Direction IMS signal circuit at DT-48493  and the ground circuit terminal. See Special Tools . The scan tool parameter should display LOW for each signal circuit when grounded.
    • If a scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition.
    • If the circuit tests normal, replace the PIM.
  4. Disconnect the transmission 16-way X175 connector. Install DT-47825-10  to the vehicle harness. See Special Tools . Connect a 3-amp fused jumper wire between the Starter signal circuit terminal and ground. The scan tool parameter should display LOW when the signal circuit is grounded.
    • If the scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition.
    • If the circuit tests normal, replace the PIM.
    5. IMPORTANT: The remaining diagnostic steps test the internal transmission components and circuits. The automatic transmission fluid pan assembly must be removed in order to perform the diagnostic tests.
  5. Disconnect the IMS connector at the switch.
      IMPORTANT: Connect one end of the DT-48493  to the transmission connector. See Special Tools . Use the other end as the terminal testing point.
    • Test the direction signal circuits and the ground circuit between the IMS and the transmission 24-way X176 connector for a short to ground, open, high resistance or short to voltage condition.
      • IMPORTANT: Connect one end of the DT-47825-10  to the transmission connector. See Special Tools . Use the other end as the terminal testing point.
    • Test the Starter signal circuit between the IMS and the transmission 16-way X175 connector for a short to ground, open, high resistance or short to voltage condition. The TCM is a pass-through of the Starter signal circuit and should be tested as a typical circuit path.
    • If the circuit, including the TCM, tests normal, replace the IMS switch.
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