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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. 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 for a short to ground. If the circuit tests normal, replace the IPC.
  3. Ignition ON, connect a 3A fused jumper wire between the MIL control circuit 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 test normal, replace the IPC/bulb.
  4. If all circuits/connections test normal, replace the ECM.
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