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.
Ground Circuits
1991 Saab 9000 S, AutomaticSECTION Ground Circuits
- Turn ignition off. Connect negative lead of ohmmeter to ground. Using positive lead, backprobe ECU terminals No. 5 and No. 17 (Black wires). Resistance should be zero ohms. If not, repair open wire to ground.
- Connect negative lead of DVOM to a good ground. Using positive lead, backprobe ECU terminals No. 5 and No. 17 (Black wires). With engine running, DVOM should indicate less than one volt. If higher than one volt, check for opens, corrosion, or loose connection on ground leads.
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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.