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Circuit/System Testing

  1. If any other instrument panel cluster (IPC) indicators or gauges are inoperative, refer to Instrument Cluster Gauges Inoperative .
  2. Ignition OFF, disconnect ECM X1 harness connector. Ignition ON, the MIL should not illuminate.
    • If the MIL is illuminated, test the MIL control circuit terminal X1-68 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 X1-68 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/connections test normal, replace the ECM.
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