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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1184 (Engine Control System - DTCS P0643 To P2A03 (VQ40DE)) >> DTC P1805: Brake Switch >> On Board Diagnosis Logic >> Fail-Safe Mode

Fail-Safe Mode

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

When the malfunction is detected, the ECM enters fail-safe mode.

Engine operating condition in fail-safe mode
ECM controls the electric throttle control actuator by regulating the throttle opening to a small range.
Therefore, acceleration will be poor.
Vehicle condition Driving condition
When engine is idling Normal
When accelerating Poor acceleration