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 5.7 N, 200C/MV9REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMCCC 4.3L TBI TESTS W/CODES
1985 Chevrolet Impala 5.7 N, 200C/MV9
CCC 4.3L TBI Tests W/Codes
1985 Chevrolet Impala 5.7 N, 200C/MV9SECTION CCC 4.3L TBI Tests W/Codes
- Model Identification
- Description
- Diagnostic System Operation
- Basic Diagnostic Procedure
- Entering Or Exiting Diagnostic Mode
- Clearing Trouble Codes
- Reading Trouble Codes
- Trouble Code Component Identification
- Trouble Code Determination (Hard Or Intermittent)
- Diagnostic Materials
- Diagnostic Tools
- Chart A1 - No "Check Engine" Light
- Chart A2 - Won't Flash Code 12 ("Check Eng" Light On Steady)
- Chart A3 - Engine Cranks But Will Not Run
- Chart A4 - Engine Cranks But Will Not Run (Cont.)
- Chart A5 - Fuel System Diagnosis
- Chart A6 - Fuel System Diagnosis (Cont.)
- Chart A7 - Fuel System Diagnosis (Cont.)
- Code 13 - Open Oxygen (O2) Sensor Circuit
- Code 14 - Coolant Sensor Signal Voltage Low
- Code 15 - Coolant Sensor Signal Voltage High
- Code 21 - TPS Signal Voltage High
- Code 22 - TPS Signal Voltage Low
- Code 24 - Vehicle Speed Sensor (VSS)
- Code 32 - EGR System Failure
- Code 33 - Map Sensor Signal Voltage High
- Code 34 - Map Sensor Signal Voltage Low
- Code 42 - Electronic Spark Timing (Est)
- Code 43 - Electronic Spark Control (ESC)
- Code 44 - Lean Exhaust Indication
- Code 45 - Rich Exhaust Indication
- Code 51 - Faulty Prom
- Code 52 - Fuel Calpac Missing
- Code 55 - Faulty ECM
- Chart B1 - Restricted Exhaust System Check
- Chart C1 - ECM Replacement Check Chart
- Chart C1A - Park/Neutral Switch
- Chart C1B - Crank Signal
- Chart C1D - Map Output Check
- Chart C2C - Idle Air Control (IAC)
- Chart C3 - Canister Purge Valve
- Chart C5 - Electronic Spark Control (ESC) System Check
- Chart C6B - Air Management Check - Pressure Operated Electric Divert/Electric Switching Valve (PEDES)
- Chart C7 - EGR Check
- Chart C8 - Transmission Converter Clutch (TCC) Electrical Diagnosis (Model 200 4R Transmissions)
- ECM Terminal Identification & Pin Voltages
- Component Locations
- 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.