Engine and Emission Control System

Even when a trouble has occurred in such area of engine & emission control system that includes the parts described in fail-safe table and a failure signal is sent to ECM, control over the injector, IAC actuator and others is maintained on the basis of the standard signals and/or back-up program prestored in the ECM while ignoring that failure signal and/or CPU. This function is called "fail-safe function". Thus, with this function, a certain level of engine performance is available even when some failure occurs in such area and disability in running is avoided.