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Home >> Saab >> 1991 >> 900 Base, 2D Hatchback, 2.1 E, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Engine Controls - System/Component Tests >> Mass Airflow Meter Burn-Off Function
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Mass Airflow Meter Burn-Off Function

  1. With mass airflow meter disconnected from air cleaner, but wiring still attached, start and warm engine 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 meter connector.
  3. With ignition on, check for 12 volts between harness connector pin No. 5 (Brown/White wire) and ground. If no voltage, repair Brown/White wire from pin No. 5 to pin No. 87B of system relay.
  4. Turn ignition off. Check for continuity between harness connector terminal No. 1 and ground. If no continuity, 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 meter. Clear codes and drive vehicle. If code appears again, reinstall original mass airflow meter and replace ECU.
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