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 TBI
1990 Chevrolet Cavalier Base, 4D Sedan, Automatic, 125C/MD9
Engine Controls - Tests W/Codes - 2.2L TBI
1990 Chevrolet Cavalier Base, 4D Sedan, Automatic, 125C/MD9SECTION Engine Controls - Tests W/Codes - 2.2L TBI
- Introduction
- Diagnostic Procedure
- Retrieving Codes (Non-Scan)
- Reading Trouble Codes
- ECM Trouble Code Definition Table
- Hard Or Intermittent Trouble Code Determination
- Clearing Trouble Codes
- ECM Location
- Diagnostic Materials
- Scan Tester Usage
- Diagnostic Codes
- Code 13, Open Oxygen Sensor Circuit
- Code 14, Coolant Sensor Signal Voltage Low
- Code 15, Coolant Sensor Signal Voltage High
- Code 21, TPS Signal Voltage High
- Code 22, TPS Signal Low
- Code 23: Mat Sensor Temp Low
- Code 24: VSS (L Body)
- Code 24: VSS (J Body)
- Code 25: Mat Sensor Temp High
- Code 32: EGR System Error
- Code 33: Map Sensor Signal Voltage High
- Code 34: Map Sensor Signal Voltage Low
- Code 42, Elect Spark Timing W/Dis
- Code 43, Elect Spark Control Signal Volt Low
- Code 44, Lean Exhaust Indication
- Code 45: Rich Exhaust Indication
- Code 51, Faulty Prom/Mem-Cal
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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.