Malfunction Indicator Lamp (MIL) Inoperative

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

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

An intermittent may be caused by any of the following conditions:
^ A poor connection Rubbed through wire insulation
^ A broken wire inside the insulation

Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent and Poor Connections in Diagrams.

If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Diagrams.

TEST DESCRIPTION
The numbers below refer to the step numbers 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.
12. If the fuse/fusible link is open, refer to PCM Wiring Diagram for complete circuit.