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 MANUALSSAAB19909000 S, 4D HATCHBACK, 2.3 B, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESFAULT CODES (WITHOUT USING ISAT SCAN TESTER)ERROR CODE 12231
1990 Saab 9000 S, 4D Hatchback, 2.3 B, Automatic
Error Code 12231
1990 Saab 9000 S, 4D Hatchback, 2.3 B, AutomaticSECTION Error Code 12231
- The check engine light is off. There is no RPM signal. This code will always be present if the test is run with the engine off. Crank engine for 5 seconds. If code disappears, the RPM signal is OK. If code does not disappear, go to step 2.
- Check fuse no. 3. Check the ignition system input at pin 1 of the LH control unit.
RENDER: 1.0x
NO RELATED
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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.