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 MANUALSCHEVROLET1989SPORTVAN G20, 4.3 Z, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM6.2L CEC TESTING
1989 Chevrolet Sportvan G20, 4.3 Z, Standard
6.2L CEC Testing
1989 Chevrolet Sportvan G20, 4.3 Z, StandardSECTION 6.2L CEC Testing
- Diagnosis & Testing
- Notes
- Diagnostic Circuit Check
- "Service Engine Soon" Light Inoperative
- ECM Check "Service Engine Soon" Light On At All Times Or Won't Flash Code 12
- Exhaust Pressure Regulator (EPR) Solenoid Electrical Circuit Check
- Exhaust Pressure Regulator (EPR) Vacuum Circuit Check
- Code 12 No Reference Pulse
- Code 14 - Coolant Temperature Sensor (Signal Voltage Low)
- Code 15 - Coolant Temperature Sensor (Signal Voltage High)
- Code 21 - Throttle Position Sensor (Signal Voltage High)
- Code 22 - Throttle Position Sensor (Signal Voltage Low)
- Code 23 - Throttle Position Sensor MISADJUSTED
- Code 24 - Vehicle Speed Sensor (VSS) Circuit
- Code 31 - Manifold Absolute Pressure Sensor (Signal Voltage Low)
- Code 32 - EGR Circuit Loop Error
- Code 33 - Manifold Absolute Pressure Sensor (Signal Voltage High)
- Code 51 - Prom Problem
- Code 52 - ECM Fault
- Code 53 - Voltage Reference Overload
- Torque Converter Clutch (TCC) Electrical Diagnosis
- Glow Plug Circuit Electrical Check
- Cold Advance System Electrical Check
- Terminal Identification & Pin Voltage Values
- 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.