Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSAAB19939000 CD, 2.3 M, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSENGINE SENSORS & SWITCHESMASS AIRFLOW SENSOR BURN-OFF FUNCTION
1993 Saab 9000 CD, 2.3 M, Standard
Mass Airflow Sensor Burn-Off Function
1993 Saab 9000 CD, 2.3 M, StandardSECTION Mass Airflow Sensor Burn-Off Function
- 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.
- 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.
- 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.
- 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.
- 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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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.