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.