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Home >> Saab >> 1993 >> 900 Base, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Mass Airflow Sensor Burn-Off Function
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Mass Airflow Sensor Burn-Off Function

  1. With mass airflow sensor disconnected from air cleaner but wiring still attached, start engine and warm it to 158°F (70°C). Let engine idle. Increase engine speed to 2500 RPM, release throttle, and again let engine idle.
  2. Turn engine off. After 4 seconds, filament should glow brightly for about one second. If filament does not glow, turn engine off and unplug mass airflow sensor connector.
  3. With ignition on, check for battery voltage between harness connector pin No. 5 (Brown/White wire) and ground. If battery voltage does not exist, repair Brown/White wire from pin No. 5 to pin No. 87B (Brown/White wire) of system main relay.
  4. Turn ignition off. Check for continuity between harness connector terminal No. 1 and ground. If no continuity exists, repair Black wire between pin No. 1 and ground terminal on intake manifold.
  5. If malfunction persists, temporarily install a known good mass air-flow sensor. Clear codes and drive vehicle. If code appears again, reinstall original mass airflow sensor and temporarily substitute known good ECM. Retest system.
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