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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Saturn Outlook, 2010 GMC Acadia, 2010 Chevrolet Traverse, and 2010 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. If any other IPC indicators or gages are inoperative, refer to Instrument Cluster Gages Inoperative .
  2. Ignition OFF, disconnect the ECM harness connectors. Ignition ON, the MIL should not illuminate.
    • If the MIL is illuminated, test the MIL control circuit terminal 54-X1 for a short to ground. If the circuit tests normal, replace the IPC.
  3. Ignition ON, connect a 3 A fused jumper wire between the MIL control circuit terminal 54-X1 and ground. The MIL should illuminate.
    • If the MIL does not illuminate, test the MIL control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the IPC.
  4. If all of the circuits/connections test normal, replace the ECM.
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