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 MANUALSSAAB19919000 CD, 2.3 M, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSEZK IGNITION CONTROL UNIT900 SERIES GROUND CIRCUIT
1991 Saab 9000 CD, 2.3 M, Standard
900 Series Ground Circuit
1991 Saab 9000 CD, 2.3 M, StandardSECTION 900 Series Ground Circuit
- Turn ignition off. Locate ignition control unit in engine compartment, forward of left front wheel housing. Connect negative lead of ohmmeter to ground. Backprobe ECU terminal No. 20 (Black wire). Resistance should be zero ohms. If not, repair open to ground.
- Connect negative lead of DVOM to a good ground. Backprobe ECU terminal No. 20. With vehicle running, DVOM should indicate less than one volt. If voltage is higher than one volt, check for open, corrosion or loose connection on ground lead.
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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.