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Home >> Nissan-Datsun >> 2019 >> Altima Edition ONE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Control System (DTC/Circuit Diagnosis) (Pr25DD) (1 Of 4)) >> DTC/Circuit Diagnosis >> P0102 MAF Sensor >> DTC Description >> PR25DD engine >> Fail-Safe

PR25DD engine: Fail-Safe

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

Engine operating condition in fail-safe mode

Fail safe mode

Vehicle behavior

Traveling control mode

Engine output control

ECM reduces the engine output, according to the rise in engine speed. This reduces the vehicle speed to encourage the driver to repair malfunction.

  • Driving at 70 km/h (44 MPH) or more is possible.
  • Driving at 40 km/h (25 MPH) or more is possible.
NOTE: This value is a reference value converted from engine power to vehicle speed. Actual power limitation value differs due to the malfunctioning part and driving condition.

Device fix mode
  • This mode fixes the electric IVT motor and the EVT control solenoid valve in the reference position.
  • The intake manifold runner control valve motor is turned OFF (intake manifold runner control valve opens).
  • A control signals is not transmitted to EGR volume control valve and the EGR volume control is deactivated.

Combustion control mode

Ignition timing correction control

Partially controls ignition timing control.

Retardation control

Controls ignition timing delay control in the intermediate water temperature range.
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