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 MANUALSSAAB1987900 BASE, 2D HATCHBACK, 2.0 J, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEM - BOSCH HALL EFFECTTESTINGIGNITION CONTROL UNIT
1987 Saab 900 Base, 2D Hatchback, 2.0 J, Automatic
Ignition Control Unit
1987 Saab 900 Base, 2D Hatchback, 2.0 J, AutomaticSECTION Ignition Control Unit
- Remove connector from ignition control unit (forward of left wheel housing) and connect voltmeter to connector terminals No. 2 and 4. Turn ignition on. Voltage should read about 12 volts. If voltage is not present, repair open in terminal No. 2 (ground circuit) or open or short in circuit No. 15 (wire from positive side of ignition coil).
- Reconnect ignition control unit connector. Disconnect coil wire from distributor cap center terminal and connect to ground using a jumper wire. Remove protective cover to gain access to rear of control unit connector.
- Connect digital voltmeter across rear of connector at terminals No. 3 and 6 of the control unit (4 and 6 on models with knock control unit). Turn ignition switch to "START" position. Voltage should be displayed while cranking engine. If NO voltage is displayed, see HALL EFFECT SENDING UNIT test.
- Turn ignition off. Disconnect 3-wire connector from distributor on all models. Connect positive voltmeter lead to terminal No. 15 of coil. Connect negative voltmeter lead to terminal No. 1 of coil.
- Turn ignition on. Voltmeter should show voltage and must drop to zero volts within 1-2 seconds. If voltage does not drop, replace Hall control unit. If voltage drops, install short jumper lead to center terminal of distributor 3-wire connector. Lightly tap lead to ground. Voltage must rise to a minimum of 2 volts for a short time. If voltage rise is not indicated, replace Hall control unit.
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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.