No Malfunction Indicator Lamp (MIL)

Diagnostic Chart:

Wiring Diagram:

Circuit Description

There should always be a steady Malfunction Indicator Lamp (MIL) when the ignition is ON and engine OFF. Battery ignition voltage is supplied to the lamp. The PCM will turn the lamp ON by grounding the ignition feed circuit.

Diagnostic Aids

If the engine cranks but will not run, check:

^ Continuous battery-fuse or fusible link for open.

^ PCM ignition fuse for open.

^ Battery Feed circuit to PCM for open.

^ Ignition Feed circuit to PCM for open.

^ Poor connection to PCM.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

5. This Step will isolate the problem in the MIL control circuit.

6. If the Battery Feed, Ignition Feed and Diagnostic Test circuits have voltage, the PCM connections, grounds, or PCM are malfunctioning.

8. Refer to PCM terminal end view for PCM pin locations of ground circuits.

12. If the fuse/fusible link is open, refer to PCM Wiring Diagram for complete circuit.