2016 Nissan-Datsun Altima BaseFACTORY OEM SERVICE PROCEDURE

Fail Safe: Description

WARNING: This page is about a different car, the 2017 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

When a DTC is detected, ECM executes a mode (in the Fail-safe mode) applicable to the DTC. The fail-safe mode has the preset traveling control mode (accelerator angle variation and engine output limit) and device fix mode.

Fail safe mode Vehicle behavior Fail safe pattern
Traveling control mode Accelerator angle variation control ECM controls the accelerator pedal depression speed to make it slower than actual speed. This causes a drop in accelerating performance and encourages the driver to repair malfunction.
NOTE:

ECM does not control the accelerator pedal releasing speed.

 A
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.
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.		 B
Device fix mode
  • Fixes electric intake valve timing control motor in the reference position.
  • Fixes exhaust valve timing control solenoid valve in the reference position.
 C
Combustion control mode Stratified charge combustion control at starting No stratified charge combustion at starting (cold start). D
Idle speed control Stops feedback control of idle speed and controls with specified speed. E
Recovery speed control at decelerating Stops recovery speed control by the fuel cut at decelerating and controls with specified speed.
Ignition timing correction control Partially controls ignition timing control. F
Retardation control Controls ignition timing delay control in the intermediate water temperature range.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.