2021 Nissan-Datsun Sentra SRFACTORY OEM SERVICE PROCEDURE

Basic Control

  • When starting, ECM controls ignition timing according to the engine speed and coolant temperature.
  • After the engine is started, ECM corrects the ignition timing according to the driving conditions (engine coolant temperature, accelerator pedal position, throttle position, control request from CVT etc.) based on the engine speed and fuel injection pulse width.
  • If knocking occurs, ECM retards the ignition timing within the anti-knocking control zone according to the knocking condition.
  • When the engine is idling, ECM controls the ignition timing to stabilize idling speed.
  • ECM controls the duration of power transmission (power transistor ON time) to ignition coil according to the engine speed and battery voltage.
  • When the engine idle speed or the ignition timing deviates from specified value, "Idle Air Volume Learning" is required.
Factory Service Tools

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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.

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