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 MANUALSCHEVROLET1987CAVALIER BASE, 4D SEDAN, STANDARD, MR3REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSIS2.0L VIN [1] TBI TESTS W/CODES
1987 Chevrolet Cavalier Base, 4D Sedan, Standard, MR3
2.0L VIN [1] TBI Tests W/Codes
1987 Chevrolet Cavalier Base, 4D Sedan, Standard, MR3SECTION 2.0L VIN [1] TBI Tests W/Codes
- Diagnostic Circuit Check - Testing
- Chart A-1: No "Service Engine Soon" Light
- Chart A-2: No Code 12, "SES" Light On Steady
- Chart A-3: Cranks But Won't Run (1 Of 3)
- Chart A-5: Fuel Pump Relay Circuit
- Chart A-7: Fuel System Diagnosis (1 Of 2)
- Chart B-1: Restricted Exhaust System Check
- Code 13: Open Oxygen Sensor Circuit
- Code 14: Coolant Sensor Temp To High
- Code 15: Coolant Sensor Temp To Low
- Code 21, TPS Signal Voltage High
- Code 22: TPS Signal Volt Low
- Code 23: Mat Temp To Low
- Code 24: Vehicle Speed Sensor (VSS) (L Body)
- Code 24: Vehicle Speed Sensor (VSS) (J Body)
- Code 25: Mat Sensor Temp To High
- Code 33: Map Sensor Signal Voltage High
- Code 34: Map Sensor Signal Volt 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 C-1A: Park Neutral Switch Diagnosis (A/T)
- Chart C-1D: Map Output Check
- Chart C-1E: P/S Pressure Switch
- Chart C-2C: Idle Air Control
- Chart C-4D: "Dis" Misfire At Idle
- Chart C-4D-2: "Dis" Misfire Under Load
- Chart C-7: EGR Valve Check
- Chart C-8A: Transmission Converter Clutch
- Chart C-8B: M/T Shift Light
- Chart C-10: A/C Clutch Control
- Chart C-12: Engine Cooling Fan
- Component Locations
- ECM Terminal Id
- Wiring Diagrams
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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.