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 MANUALSCHEVROLET1989HI-CUBE 5.7 K, 475/M40REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM6.2L CEC TESTING
1989 Chevrolet Hi-Cube 5.7 K, 475/M40
6.2L CEC Testing
1989 Chevrolet Hi-Cube 5.7 K, 475/M40SECTION 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.