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 MANUALSCHEVROLET1985CAVALIER BASE, 4D SEDAN, 2.8 W, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM2.0L TBI TESTS W/CODES
1985 Chevrolet Cavalier Base, 4D Sedan, 2.8 W, Standard
2.0L TBI Tests W/Codes
1985 Chevrolet Cavalier Base, 4D Sedan, 2.8 W, StandardSECTION 2.0L TBI Tests W/Codes
- Model Identification
- Description
- Diagnostic System Operation
- Basic Diagnostic Procedure
- Entering Or Exiting Diagnostic Mode
- Clearing Trouble Codes
- Reading Trouble Codes
- Trouble Code Component Identification
- Trouble Code Determination (Hard Or Intermittent)
- Diagnostic Materials
- Diagnostic Tools
- Diagnostic Circuit Check
- Notes
- Chart A1 - No "Check Engine" Light
- Chart A2 - Won't Flash Code 12 ("Check Eng" Light On Steady)
- Chart A3 - Engine Cranks But Will Not Run
- CHART A4 - ENGINE CRANKS BUT WILL NOT RUN (Cont.)
- Chart A5 - Fuel System Diagnosis
- CHART A6 - FUEL SYSTEM DIAGNOSIS (Cont.)
- 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 Voltage Low
- Code 24 - Vehicle Speed Sensor (VSS)
- Code 33 - Map Sensor Signal Voltage High
- Code 34 - Map Sensor Signal Voltage Low
- Code 42 - Electronic Spark Timing (Est)
- Code 44 - Lean Exhaust Indication
- Code 45 - Rich Exhaust Indication
- Code 51 - Prom Failure
- Code 52 - Fuel Calpac Missing
- Code 54 - Fuel Pump Circuit Low Voltage
- Code 55 - Replace ECM
- Chart C1 - ECM Replacement Check Chart
- Chart C1A - Park/Neutral Switch
- Chart C1B - Crank Signal
- Chart C1D - Map Output Check
- Chart C1E - Power Steering Pressure Switch (PSPS) Signal
- Chart C2C - Idle Air Control (IAC)
- Chart C7A - EGR Valve Check (Non-ECM Controlled)
- Chart C8 - TCC Electrical Diagnosis (125C Transaxle) Transmission Converter Clutch (TCC) Electrical Diagnosis (125C Transaxle)
- Chart C8B - Shift Light
- Chart C10 - A/C Clutch Control
- Chart C12 - Engine Cooling Fan
- Component Locations
- ECM Terminal Identification
- Wiring Diagram
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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.