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 MANUALSCHEVROLET1989CAPRICE BASE, 4.3 Z, 700R4/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM4.3L TBI TESTS W/CODESECM TROUBLE CODE DEFINITIONS
1989 Chevrolet Caprice Base, 4.3 Z, 700R4/MD8
ECM Trouble Code Definitions
1989 Chevrolet Caprice Base, 4.3 Z, 700R4/MD8SECTION ECM Trouble Code Definitions
ECM TROUBLE CODE DEFINITION (4.3L TBI)
| 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. | ||
| 24 | VSS circuit. | ||
| 32 | EGR system failure. | ||
| 33 | MAP sensor signal voltage high. | ||
| 34 | MAP sensor signal voltage low. | ||
| 42 | EST circuit open or grounded. | ||
| 43 | Electronic Spark Control (ESC). | ||
| 44 | Lean oxygen sensor value. | ||
| 45 | Rich oxygen sensor value. | ||
| 51 | Faulty PROM, MEM-CAL or ECM. | ||
| 52 | Faulty/missing CALPAC or MEM-CAL. | ||
| 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.