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Hall Effect Sensor

WARNING: This page is about a different car, the 1991 Saab 9000 and 1991 Saab 900. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on. Connect DVOM between ignition ECU terminals No. 4 (Red wire) and No. 10 (Black wire) on 900 Series, or between terminals No. 6 (Red wire) and No. 15 (Black wire) on 9000 Series. Voltage should be at least 10 volts.
  2. Connect DVOM between ignition ECU terminals No. 10 (Black wire) and No. 24 (Green/Red wire) on 900 Series, or between terminals No. 15 (Black wire) and No. 23 (Green/Red wire) on fuel injection ECU on 9000 Series. Slowly turn engine over by hand. Voltage should be less than 0.4 volt (shutter open) or higher than 3.0 volts (shutter closed).
  3. If voltage is not as specified, check wiring harness and connectors. If wiring and connectors are okay, replace Hall Effect sensor, located behind crankshaft pulley.
  4. If engine performance is poor, check ignition timing. If timing marks appear to move back and forth, inspect sensor for chips or a loosely mounted magnet. Repair or replace as necessary.
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