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Circuit/System Testing

  1. If any other indicators are inoperative on the instrument panel (IP) cluster, refer to Symptoms - Instrument Panel, Gages and Console in Instrument Panel, Gages, and Console.
  2. Ignition OFF, disconnect the ECM harness connector.
  3. Ignition ON, the MIL should not illuminate.
    • If the MIL illuminates, test the MIL control circuit for a short to ground. If the circuit test normal, replace the instrument panel (IP) cluster.
  4. Ignition ON, connect a 3-amp 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 instrument panel (IP) cluster.
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