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Home >> Chevrolet >> 2008 >> Optra LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (Diesel) >> Diagnostic Information and Procedures >> DTC P1663 >> Circuit/System Testing

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 lamp should not illuminate.
    • If the lamp is illuminated, test the lamp 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 lamp control circuit and ground. The lamp should illuminate.
    • If the lamp does not illuminate, test the lamp 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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