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.
9000 Series Ground Circuit
1991 Saab 9000 S, AutomaticSECTION 9000 Series Ground Circuit
- Locate ignition control unit under driver's seat. Turn ignition off. Connect negative lead of ohmmeter to ground. Using positive lead, check for continuity between ECU terminal No. 13 (Black wire) and ground. Resistance should be zero ohms. If not, repair open to ground.
- Connect negative lead of DVOM to a good ground. Backprobe ECU terminal No. 13 (Black wire). 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.
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.