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Home >> Infiniti >> 2007 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0451 To P1217 >> DTC P0643 Sensor Power Supply >> On Board Diagnosis Logic >> Fail-Safe Mode

Fail-Safe Mode

When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.

ENGINE OPERATION CONDITION CHART

Engine operation condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
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