Fuel Cutoff

Fuel cutoff occurs when the PCM stops fuel injection or turns off the fuel pump. Fuel cutoff is used during the following conditions:

• During deceleration, when the throttle valve is closed and engine speed is high, fuel injection is stopped so that unburned gas will not be exhausted. Fuel injection starts again when the engine speed decreases to less than 1,200 RPM.
• In order to prevent engine overrun, which adversely affects the engine, fuel injector delivery stops when the engine speed exceeds 6,800 RPM. Fuel delivery starts again when the engine speed decreases to less than 6,500 RPM.
• In order to minimize any possible fuel spillage during an airbag deployment event, the fuel pump is de-energized,. The PCM receives a signal from the supplemental inflatable restraint (SIR) system and turns off the fuel pump relay. The relay is re-energized once the ignition switch is cycled off and then on again.