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 MANUALSCHEVROLET1986CAVALIER RS, 2D HATCHBACK, 2.8 W, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM2.8L PFI TESTS W/CODESECM TROUBLE CODE DEFINITIONS
1986 Chevrolet Cavalier RS, 2D Hatchback, 2.8 W, Automatic
ECM Trouble Code Definitions
1986 Chevrolet Cavalier RS, 2D Hatchback, 2.8 W, AutomaticSECTION ECM Trouble Code Definitions
ECM TROUBLE CODE DEFINITION
| Code No. | Circuit Affected | ||
|---|---|---|---|
| 12 (1) | No RPM reference pulse | ||
| 13 | Open oxygen sensor circuit | ||
| 14 | Coolant sensor circuit shorted | ||
| 15 | Coolant sensor circuit open | ||
| 21 | TPS signal voltage high | ||
| 22 | TPS signal voltage low | ||
| 23 | MAT voltage high | ||
| 24 | VSS circuit | ||
| 25 | MAT sensor signal voltage low | ||
| 32 | EGR vacuum control signal | ||
| 33 | MAP sensor voltage high | ||
| 34 | MAP sensor voltage low | ||
| 35 | IAC (EFI) speed error | ||
| 41 | No distributor reference (HEI) | ||
| 41 | C(3)I ignition - cam sensor loss | ||
| 41 | Cylinder select error (MEM-CAL) | ||
| 42 | EST circuit open or grounded | ||
| 43 | ESC retard signal too low | ||
| 44 | Lean oxygen sensor value | ||
| 45 | Rich oxygen sensor value | ||
| 51 | Faulty PROM, MEM-CAL or ECM | ||
| 52 | Faulty/missing CALPAC or MEM-CAL | ||
| 53 | Faulty alternator, voltage high | ||
| 54 | Fuel pump voltage low | ||
| 55 | Faulty ECM | ||
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NOTE:
Trouble code charts should only be used if "SERVICE ENGINE SOON" light is illuminated (indicating a current problem exists). Exceptions are Code 13, 15, 24, 44 and 45 charts, which may be used to help diagnose intermittent codes.
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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.