LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2009 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Control System - DTCS P0643 To P2A00 (MR20DE-CALIFORNIA)) >> DTC P2127, P2128 App Sensor >> On Board Diagnosis Logic >> Fail-Safe Mode
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fail-Safe Mode

WARNING: This page is about a different variant/trim than selected.

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

ENGINE OPERATING CONDITION CHART

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.