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Home >> Pontiac >> 2009 >> G3 Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Engine Controls And Fuel - 1.6L (LDE, LLU, And LXV) Or 1.8L (2H0) - Troubleshooting And Diagnosis) >> Malfunction Indicator Lamp (MIL) Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
  1. If any other indicators are inoperative, refer to Symptoms - Displays and Gauges .
  2. Ignition OFF, disconnect the ECM harness connector X1.
  3. Ignition ON, the MIL should not illuminate.
    • If the MIL illuminates, test the MIL control circuit terminal 1-X1 for a short to ground. If the circuit test normal, replace the bulb/IPC.
  4. Ignition ON, connect a 3 A fused jumper wire between the MIL control circuit terminal 1-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 test normal, replace the bulb/IPC.
  5. If all circuits test normal, replace the ECM.
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