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 MANUALSSAAB1990900 BASE, 2D HATCHBACK, 2.0 D, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGIGNITION CHECKSEZK IGNITION SYSTEMHALL EFFECT SENSOR
1990 Saab 900 Base, 2D Hatchback, 2.0 D, Standard
Hall Effect Sensor
1990 Saab 900 Base, 2D Hatchback, 2.0 D, StandardSECTION Hall Effect Sensor
NOTE:
Make all checks at the back of electrical connectors for EZK electronic control unit (ECU) with ignition on.
- To test sensor supply voltage, connect voltmeter between terminal No. 10 and 4 of ECU. See WIRING DIAGRAMS article. Voltmeter reading should be battery voltage.
- To test signal from Hall Effect sensor to ECU, connect voltmeter between terminal No. 10 and 24 of ECU. See WIRING DIAGRAMS article. Slowly turn engine by hand. Voltmeter reading should vary from 0.4-3.0 volts as Hall Effect sensor shutter opens and closes.
RENDER: 1.0x
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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.