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 PERFORMANCETESTING & DIAGNOSISDIESEL CEC SYSTEM - W/EXTERNAL EGR
1985 Chevrolet Impala 4.3 Z, 700R4/MD8
Diesel CEC System - W/External EGR
1985 Chevrolet Impala 4.3 Z, 700R4/MD8SECTION Diesel CEC System - W/External EGR
- Description
- Operation
- Removal & Installation
- Basic Diagnostic Procedure
- Trouble Code Identification
- Component Testing
- Trouble Shooting
- Diagnostic Circuit Check
- Chart A1, "Check Engine" Light (CEL) Malfunction
- Code 12, No Rpm Signal-Vehicle Standing
- Code 14, Cts Circuit - Voltage Low
- Code 15, Cts Circuit - Voltage High
- Code 21, Metering Valve Sensor (MVS)
- Code 22, Metering Valve Sensor (MVS)
- Code 24, Vehicle Speed Sensor (VSS)
- Code 41, No Rpm Signal - Vehicle In Motion
- Code 51, Prom Error
- Code 53, EGR Control Error
- Code 55, 5 Volt Reference Circuit
- Chart C2, Map Sensor Check
- Chart C3, EGR Solenoid Check
- Chart C4, EPR Solenoid Check
- Chart C5, Vacuum Control Check
- Chart C6, HPCA Electrical Check
- Chart C7, HPAA/AFL Electrical Check
- Chart C8-1,TCC Check
- Chart C8-2, TCC Check (Cont.)
- Chart C9, Fast Idle Solenoid Electrical Check
- Wiring Diagram
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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.