Fail-Safe Operation

Even when a trouble has occurred in such areas of Electronic Fuel Injection system that include the following parts and a failure signal is sent to ECM, control over the injector, idle air control valve and other 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 Central Processing Unit (CPU). This function is called "fail-safe function". Thus, with this function, a ceratin level of engine performance is available even when some failure occurs in such areas so that disability in running is avoided.
^ Engine coolant temp. sensor
^ Throttle position sensor
^ Mass air flow sensor
^ CPU in ECM