Malfunction Indicator Lamp: Description and Operation

"Check Engine" Light Circuit:

"CHECK ENGINE" light is located among the instrument cluster. It indicates each result of diagnosis done by ECM's self-diagnosis function. It also lights under the conditions as described below regardless of Electronic Fuel Injection system condition.

^ When ignition switch is turned ON, engine is at a stop (When engine speed is lower than 500 rpm.) and diagnosis switch terminal is ungrounded, "CHECK ENGINE" light turns ON for the purpose of light and its circuit check but turns OFF once engine is started (When engine speed is higher than 500 r/min.) as far as Electronic Fuel Injection system is in good condition.