Fail Safe Chart

ECCS CHART

FAIL-SAFE SYSTEM DESCRIPTION
Air Flow Meter Malfunctioning
If the air flow meter output voltage is lower or higher than the specified value, E.C.U. senses an air flow meter malfunctioning. In case air flow meter malfunctions, the throttle sensor substitutes for the air flow meter.
Though air flow meter is malfunctioning, it is possible to drive the vehicle and start the engine. But engine speed will not rise more than 2,400 rpm in order to inform the driver of fail-safe system operation while driving.




Operation

WATER TEMPERATURE SENSOR
Description
When the output signal of water temperature sensor is abnormal the E.C.U. judges it as a malfunctioning of water temperature sensor. The E.C.U. decides the water temperature according to the ignition switch signal.




Operation

THROTTLE SENSOR
Description
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. decides the throttle valve opening according to the idle switch signal.




Operation