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 MANUALSCHEVROLET1990CAVALIER BASE, 4D SEDAN, AUTOMATIC, 125C/MD9REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 2.2L TBISCAN TESTER USAGESUMMARY
1990 Chevrolet Cavalier Base, 4D Sedan, Automatic, 125C/MD9
Scan Tester Usage: Summary
1990 Chevrolet Cavalier Base, 4D Sedan, Automatic, 125C/MD9SECTION Summary
If no hard fault codes are present, driveability symptoms exist or intermittent codes exist, proceed to H - TESTING W/O CODES article for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.), or intermittent diagnostic procedures.
NOTE:
The following diagnostic flow charts and mini-schematics are supplied courtesy of General Motors Corp.
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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.