Fail-safe System
EF & EC-222prose procedureGA16DE engine. Note: source reads "fixed at the preset valve" (likely "value").
ENGINE AND EMISSION CONTROL SYSTEM DESCRIPTION
Fail-safe System
C.P.U. MALFUNCTION OF E.C.U.
Outline
The fail-safe system makes engine starting possible if there is something malfunctioning in the E.C.U.'s C.P.U. circuit. In former models, engine starting was difficult under the conditions mentioned above. But with the provisions provided in this fail-safe system, it is possible to start the engine.
Fail-safe system activating condition when E.C.U. is malfunctioning
The computing function of the E.C.U. was judged to be malfunctioning. When the fail-safe system activates, i.e. if the E.C.U. detects a malfunction condition in the C.P.U. of E.C.U., the CHECK ENGINE LIGHT on the instrument panel lights to warn the driver.
Engine control, with fail-safe system, operates when E.C.U. is malfunctioning
When the fail-safe system is operating, fuel injection, ignition timing, fuel pump operation, A.A.C. valve operation and radiator fan operation are controlled under certain limitations.
Operation
Operation
Fuel injection
OperationSimultaneous injection
Ignition timing
OperationIgnition timing is fixed at the preset valve.
Fuel pump
OperationFuel pump relay is "ON" when engine is running and "OFF" when engine stalls.
A.A.C. valve
OperationFull open
Radiator fans
OperationRadiator fan relay "ON"
Cancellation of fail-safe system when E.C.U. is malfunctioning
Activation of the fail-safe system is canceled each time the ignition switch is turned OFF. The system is reactivated if all of the above-mentioned activating conditions are satisfied after turning the ignition switch from OFF to ON.