Engine and Emission Control System

Fail-safe function
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 (PCM), control over the injections, IAC valve and others is maintained on the basis of the standard signals and/or back-up program prestored in the ECM (PCM) 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.