MIL Remains on After Engine Starts
MIL Remains ON after Engine StartsWiring Diagram
Wiring Diagram:
Circuit Description
When the ignition switch is turned to ON position, ECM causes the main relay to turn ON (close the contact point). Then, ECM being supplied with the main power, transmits indication ON signal of MIL to combination meter in order to turn ON MIL. And then, combination meter turns ON MIL. When the engine starts to run and no malfunction is detected in the system, ECM transmits MIL indication OFF signal to combination meter in order to turn OFF MIL. And then, combination meter turns OFF MIL, but if a malfunction was or is detected, MIL remains ON even when the engine is running.
Troubleshooting
NOTE: When measuring circuit voltage and/or pulse signal at ECM connector, connect special tool to ECM and ECM connectors.
Step 1:
