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 MANUALSCHEVROLET1985IMPALA 4.3 Z, 700R4/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFEEDBACK CARBURETOR TESTS W/CODESTROUBLE CODE COMPONENT IDENTIFICATION
1985 Chevrolet Impala 4.3 Z, 700R4/MD8
Trouble Code Component Identification
1985 Chevrolet Impala 4.3 Z, 700R4/MD8SECTION Trouble Code Component Identification
ECM TROUBLE CODE IDENTIFICATION
| Code | Circuit Affected | ||
|---|---|---|---|
| 12 | (1) | ||
| 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 | M/C solenoid circuit open or grounded. | ||
| 24 | VSS circuit. | ||
| 24B | Park/Neutral Switch. | ||
| 25 | MAT sensor signal voltage low. | ||
| 31 | Wastegate solenoid. | ||
| 32 | BARO sensor circuit. | ||
| " | EGR vacuum control (3.0L & 3.8L turbo). | ||
| 33 | MAP sensor voltage too high. | ||
| 33 | MAF sensor frequency high (Fuel Injection). | ||
| 34 | MAP sensor voltage too low. | ||
| 34 | MAF sensor frequency low (Fuel Injection). | ||
| 35 | ISC switch circuit shorted. | ||
| 41 | No distributor reference circuit. | ||
| 41 | C(3)I ignition (3.8L turbo). | ||
| 42 | EST circuit. | ||
| 42 | C(3)I ignition - cam sensor loss (3.8L turbo). | ||
| 43 | ESC retard signal too low. | ||
| 44 | Lean oxygen sensor value. | ||
| 45 | Rich oxygen sensor value. | ||
| 51 | Faulty PROM, PROM installation or ECM. | ||
| 52 | Faulty CALPAC. | ||
| 53 | EGR vacuum control (carb. models). | ||
| 54 | M/C solenoid high (carb. models). | ||
| 55 | Faulty ECM. | ||
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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.