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 MANUALSCHEVROLET1985SPORTVAN G20, 6.2 C, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDIESEL CEC TESTS W/CODESTROUBLE CODE IDENTIFICATION
1985 Chevrolet Sportvan G20, 6.2 C, Standard
Trouble Code Identification
1985 Chevrolet Sportvan G20, 6.2 C, StandardSECTION Trouble Code Identification
ECM TROUBLE CODE IDENTIFICATION
| Code | Circuit Affected | ||
|---|---|---|---|
| 12 | (1) | ||
| 21 | TPS signal voltage high. | ||
| 22 | TPS signal voltage low. | ||
| 24 | VSS circuit. | ||
| 31 | MAP sensor signal voltage low. | ||
| 32 | EGR vacuum circuit. | ||
| 33 | MAP sensor signal voltage high. | ||
| 51 | PROM faulty or improperly installed. | ||
| 52 | Fault in ECM circuit. | ||
| 53 | 5-volt reference circuit overloaded (grounded). | ||
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RENDER: 1.0x
NO RELATED
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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.