The Fuel-Shut Off Function

The fuel-shut off function secures occupant's safety.

ECM or FPCM controls the fuel-shut off function according to the following sensors and signals.

• Throttle position sensor 1 and 2 (Throttle valve position)
• ECM (Engine speed)
• Supplemental restraint system control unit (direct crash signal)

ECM or FPCM performs the fuel shut-off function when detecting the conditions below.

• Mechanical malfunction in throttle position sensor 1 and 2
• Abnormal engine speed signal
• Crash signal

MECHANICAL MALFUNCTION IN THROTTLE VALVE ACTUATOR

When detecting a mechanical malfunction in the throttle valve according to signals from throttle position sensor 1 and 2, ECM controls the operation of the fuel injector and controls engine speed as follows.

• At idle: 1, 400 RPM
• At driving: 1, 800 RPM

ABNORMAL ENGINE SPEED SIGNAL

FPCM controls the operation of the fuel pump when an engine speed signal is not transmitted from ECM.

CRASH SIGNAL

If the ECM receives a crash signal indirectly via the CAN communication or directly from the air bag diagnosis sensor unit, it switches off the fuel pump over the fuel system control unit and the quantity control valve, and briefly actuates the fuel injectors to depressurize the fuel pump. After air bag has deployed, ECM inhibits the engine from starting. To cancel the engine start inhibition, perform "Enabling of engine start after crash event" in Work Support of CONSULT. Refer to DESCRIPTION .