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 engine OFF. Battery ignition voltage is supplied to the lamp. The PCM will turn the lamp ON by grounding the MIL control 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
The numbers below refer to the step numbers on the Diagnostic Table.
3. This step will isolate the problem in the MIL control circuit.
4. If the Battery Feed, Ignition Feed and diagnostic test circuits have voltage, the PCM connections, the grounds, or the PCM are malfunctioning.
6. Refer to the PCM terminal end view in this section for the PCM pin locations of the ground circuits.
9. If the fuse/fusible link is open, refer to PCM Wiring Diagram for a complete circuit.