Malfunction Indicator Lamp Remains ON after Engine Starts
Wiring Diagram
1. Relay box 5. “IG” fuse 9. “IGN1” fuse
2. Ignition switch 6. “MTR” fuse 10. “FI” fuse
3. Main relay 7. ECM    
4. Malfunction indicator lamp in combination meter 8. Circuit fuse box      
Circuit Description
When the ignition switch is turned ON, ECM causes the main relay to turn ON (close the contact point). Then, ECM being supplied with the main power, turns ON the malfunction indicator lamp (MIL). When the engine starts to run and no malfunction is detected in the system, MIL goes OFF but if a malfunction was or is detected, MIL remains ON even when the engine is running.
Step Action YES NO
DTC check
1) Start engine and recheck DTC while engine running.
Is there any DTC(s)?
Go to Step 2.
MIL circuit check
1) Turn ignition switch to OFF position.
2) Remove combination meter referring to Combination Meter Removal and Installation .
3) Disconnect connectors from ECM.
4) Measure resistance between “PPL/YEL” wire terminal of combination meter connector and vehicle body ground.
Is resistance infinity?
Go to Step 3.
“PPL/YEL” wire shorted to ground circuit.
MIL circuit check
1) Connect connectors to combination meter.
Does MIL turn ON at ignition switch turned ON?
Replace combination meter.
Substitute a known-good ECM and recheck.