ECM Malfunction

CPU Malfunction Input/Output Line:

OPERATION
The fail-safe mode operates when the computing function of the ECCS Control Module (ECM) is judged to be malfunctioning. When the fail-safe system activates, i.e. if a malfunction condition is detected in the CPU of the ECM, the Malfunction Indicator Lamp on the instrument panel lights to warn the driver.
When the fail-safe system is operating, fuel injection, ignition timing, fuel pump operation, engine idle speed, and so on are controlled under certain limitations.

CANCELLATION
Activation of the fail-safe system is canceled each time the ignition switch is turned OFF. The system is reactivated if all of the activating conditions are satisfied after turning the ignition switch from OFF to ON.