Fail-Safe Mode

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

Fig 1: Identifying Engine Operation Condition In Fail-Safe Mode

Courtesy of NISSAN MOTOR CO., U.S.A.

Engine operating 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.