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 MANUALSSAAB1993900 S, 2D HATCHBACK, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLS (EXCEPT 9000 SERIES TURBO)FUEL INJECTION ECMGROUND CIRCUITS
1993 Saab 900 S, 2D Hatchback, Standard
Ground Circuits
1993 Saab 900 S, 2D Hatchback, StandardSECTION Ground Circuits
- Turn ignition off. Connect negative lead of ohmmeter to ground. Using positive lead, backprobe ECM terminals No. 5 and 17 (Black wires). Resistance should be zero ohms. If resistance is not zero ohms, repair open wire to ground. See Fig 1 .
- Connect negative lead of DVOM to a good ground. Using positive lead, backprobe ECM terminals No. 5 and 17 (Black wires). With engine running, DVOM should indicate less than one volt. If voltage is more 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.