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Home >> Nissan-Datsun >> 1991 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - System/Component Tests >> Fuel Control System >> Feedback System
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Feedback System

  1. NX & Sentra models use a single Red LED. Start engine and warm to operating temperature. Ensure idle speed and timing are adjusted to specification. Increase engine speed to about 2000 RPM for 2 minutes under no-load condition; enter self-diagnostic Mode II and monitor Red LED on ECU.
  2. Red LED should flash a minimum of 5 times every 10 seconds. If Red LED does not respond as described, check idle mixture (CO percentage level). See ADJUSTMENTS article. If idle mixture adjustment does not affect LED operation, check fuel pressure regulator, airflow meter, injector(s), engine (coolant) temperature sensor or ECU.
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