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Home >> Infiniti >> 2004 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> DTC P2138: App Sensor >> On Board Diagnosis Logic >> Fail-Safe Mode
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Fail-Safe Mode

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

FAIL-SAFE MODE

Engine operating condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.