Spark

Malfunction Indicator Lamp (MIL) Diagnosis

Ignition voltage is supplied directly to the malfunction indicator lamp (MIL). The engine control module (ECM) turns the MIL ON by grounding the MIL control circuit. There should be a steady MIL with the ignition ON and the engine OFF.

Schematic Reference

Engine Controls Schematics : Siemens ECM - LPG with LCP → Siemens ECM - Gas without FX3 or LCP → Delphi ECM - FX3

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Scan Tool Reference

Control Module References

Ignition ON, command the P16 instrument cluster MIL ON and OFF with a scan tool. The MIL should turn ON and OFF as commanded.

1. If any other indicators are inoperative, refer to Symptoms - Displays and Gauges
2. Ignition OFF, disconnect the harness connector X1 at the K20 engine control module.
3. Ignition ON, verify that the MIL is not illuminated.

⇒	If the MIL is illuminated, test the MIL control circuit for a short circuit to ground. If the circuit tests normal, replace the P16 instrument cluster.

4. Ignition ON, connect a 3A fused jumper wire between the MIL control circuit terminal below and ground. The MIL should illuminate.

•	MIL control circuit terminal 39 (Without FX3)

•	MIL control circuit terminal 92 (FX3)

⇒	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 P16 instrument cluster/bulb.

5. If all circuits test normal, replace the K20 ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.