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Circuit/System Testing

  1. If any other IPC indicators or gages are inoperative, refer to Symptoms - Displays and Gages .
  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 tests normal, replace the IPC/bulb.
  4. If all circuits test normal, replace the ECM.
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