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 MANUALSSAAB1995900 SE, 2D HATCHBACK, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 2.0L TURBOCOMPUTERIZED ENGINE CONTROLSELECTRONIC CONTROL MODULE (ECM)GROUND CIRCUIT
1995 Saab 900 SE, 2D Hatchback, Standard
Ground Circuit
1995 Saab 900 SE, 2D Hatchback, StandardSECTION Ground Circuit
- Turn ignition off. Locate ECM, on right kick panel, behind trim. Connect negative lead of ohmmeter to ground. Backprobe ECM terminals No. 24 (Black wire), No. 25 (Black wire), and No. 47 (Black wire). Resistance should be zero ohms for each wire. If resistance is as specified, go to next step. If resistance is not as specified, repair open to ground.
- Connect negative lead of DVOM to a good ground. Backprobe each terminal specified in step 1). With vehicle running, DVOM should indicate less than one volt. If voltage is higher than one volt, inspect for open, corrosion, or loose connection on appropriate 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.