Fail-safe System (Cont'd)

When engine temperature sensor output voltage is below or above the specified value, water temperature is fixed at the preset value as follows:

When the output signal of the detonation sensor is abnormal, the E.C.U. judges it to be malfunctioning. When detonation sensor is malfunctioning, ignition timing will retard according to operating conditions.

When the output signal of throttle sensor is abnormal the E.C.U. judges it as a malfunctioning of throttle sensor. The E.C.U. does not use the throttle sensor signal, but judges the idle position by the amount of fuel injected and the engine rpm.