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 MANUALSCHEVROLET1985CHEVY VAN G20, 6.2 C, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 13 (ENGINE CONTROLS - TESTS W/CODES - 4.3L)
1985 Chevrolet Chevy Van G20, 6.2 C, Standard
Section 13 (Engine Controls - Tests W/Codes - 4.3L)
1985 Chevrolet Chevy Van G20, 6.2 C, StandardSECTION Section 13 (Engine Controls - Tests W/Codes - 4.3L)
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 1994 Oldsmobile Bravada, 1994 GMC Vandura, 1994 GMC Sonoma, 1994 GMC Safari, and 1994 GMC Rally. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Self-Diagnostic System
- Trouble Code Charts - 4.3L (Exc M/T "S" & "T" Series Pickup)
- Notes
- Code 13, Open Oxygen Sensor Circuit
- Code 14, Coolant Sensor Signal Voltage Low
- Code 15, Coolant Sensor Signal Voltage High
- Code 16, VSS Buffer Fault - "G", "L", "M", "S" & "T" Series
- Code 21, TPS Signal Voltage High
- Code 22, TPS Signal Voltage Low
- Code 23, Intake Air Temperature Low
- Code 24, VSS - "P" Series M/T & "S" & "T" Series UTIL VEH M/T
- Code 24, VSS - 4.3L "T" Series Pickup M/T
- Code 24, VSS Transmission Output Signal - "G", "L" & "M" Series, "P" Series M/T & "S" & "T" Series A/T
- Code 25, Intake Air Temperature High
- Code 32, EGR Circuit Error With Linear EGR
- Code 32, EGR Circuit Error - "P" Series 4.3L M/T
- Code 32, EGR Circuit Error - Models Using Manifold Vacuum, 2-Terminal Solenoid & BACKPRESSURE EGR
- Code 32, EGR CKT Error Models Using Ported Vacuum & EVRV Sol
- Code 33, Map Sensor Signal Voltage High
- Code 34, Map Sensor Signal Voltage Low
- Code 35, Idle Speed Error
- Code 36, Idle SPD Actuator Fault - "C", "K" & "P" Series A/T
- Code 42 - Ignition Control
- Code 43, Knock Sensor (Dual Sensors) - "S" & "T" Series
- Code 43, Knock Sensor W/O Spark Module (Single Sensor) - "C", "G", "K" & "P" Series A/T
- Code 43, Knock Sensor With Spark Control Module - "C", "K" & "P" Series
- Code 44, Lean Exhaust Indication
- Code 45, Rich Exhaust Indication
- Code 51, Prom Error (Faulty Or Incorrect Prom)
- Code 52, Faulty CALPAK
- Code 53, System OVERVOLTAGE
- Code 55, ECM/Pcm Error
- Code 54, Fuel Pump Circuit
- Trouble Code Charts - 4.3L "S" & "T" Series Pickup M/T
- Code P0107, Map Sensor CKT - 4.3L "S" & "T" Series Pickup M/T
- Code P0108, Map Sensor CKT - 4.3L "S" & "T" Series Pickup M/T
- Code P0117, Coolant Temp. Sens - "S" & "T" Series Pickup M/T
- Code P0118, Coolant Temp. Sensor - 4.3L "S" & "T" Series Pickup M/T
- Code P0122, Throttle Pos Sens - 4.3L "S" & "T" Series P/U M/T
- Code P0123, Throttle Pos Sens - 4.3L "S" & "T" Series P/U M/T
- Code P0139, Heated O2 Sens Open CKT - 4.3L "S" & "T" Series Pickup M/T
- Code P0171, Lean Exhaust - 4.3L "S" & "T" Series Pickup M/T
- Code P0172, Rich Exhaust - 4.3L "S" & "T" Series Pickup M/T
- Code P0320, IGN CNTRL Error - 4.3L "S/T" Series Pickup - M/T
- Code P0327, Knock Sensor Grounded - 4.3L "S/T" Pickup - M/T
- Code P0328, Knock Sensor Open - 4.3L "S/T" Pickup - M/T
- Code P0400, (EGR) Error - 4.3L "S" & "T" Series Pickup M/T
- Code P0500, VSS Circuit - 4.3L "S" & "T" Series Pickup M/T
- Code P1222, Fuel Pump VLTGE Low - 4.3L "S/T" Pickup - M/T
- Summary
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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.