Fuel Shut-Off

Fuel shut-off during deceleration

Fuel to each cylinder is cut off during deceleration for restraint of HC and improvement of fuel efficiency.

Engine speed at which fuel shut-off and recovery is conducted are programmed in detail according to various factors such as idle judgment, vehicle speed, gear position, engine coolant temperature etc. for optimizing emission and mileage performance. Also, no fuel shut-off is applied at extreme deceleration.

Fuel shut-off when the engine speed is excessively high

Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or operation of the vehicle at excessively high speeds.

Fuel shut-off when the engine speed is excessively high with no load

ECM shuts off fuel for all cylinders at the engine speed is high, and the vehicle speed is 0 km/h with N or P gear position for more than certain duration.

Fuel shut-off when the engine is over heating

ECM judges as the engine is over heating and conducts fuel shut-off when the output voltage of engine coolant temperature sensor exceeds the over heating judgment voltage for certain duration.

Also, malfunction indicator lamp (MIL) illuminates when the engine is judged as over heating.

And, once the engine over heating judgment is made, malfunction indicator lamp (MIL) remains ON even the engine coolant temperature becomes low (returns to normal), then fuel will be shut off at 2, 000 rpm.

Fuel shut-off will be deactivated when the ignition key is turned OFF once, but malfunction indicator lamp (MIL) remains ON. The deactivation of malfunction indicator lamp (MIL) can be done by clearing self diagnosis results.

CAUTION: Erase self diagnosis results only after the investigation of the engine over heating cause.

Fuel shut-off when N > D position is selected

Fuel shut-off is conducted when the engine speed is high and N > D position is selected.

Fuel shut-off when the engine stalls consecutively

To protect CVT, ECM conducts fuel shut-off when the engine speed is high despite the vehicle speed is excessively slow for more than several minutes with gear position except N or P. This control is not conducted when the malfunction of vehicle speed signal exists.

Fuel shut-off when malfunction indicator lamp (MIL) system is not working

ECM warns driver by conducting fuel shut-off when the request to illuminate malfunction indicator lamp (MIL) due to some of the self diagnosis relating electric throttle system or ECM continuously exist for more than 5 trips. ECM shuts off fuel at approx. 2, 500 rpm and recovers at approx. 2, 000 rpm.

Fuel shut-off when the throttle stuck to closed position

ECM conducts fuel shut-off when the electric throttle is stuck to its closed position.

But, for the sake of heating capability, ECM allows the engine start at N or P gear position with limited engine speed.