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 MANUALSCHEVROLET1988CHEVY VAN G30, 4.3 ZREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMCCC TBI TESTS W/CODES
1988 Chevrolet Chevy Van G30, 4.3 Z
CCC TBI Tests W/Codes
1988 Chevrolet Chevy Van G30, 4.3 ZSECTION CCC TBI Tests W/Codes
- Model Identification
- Testing & Diagnosis
- Diagnostic Charts
- System Check - Flow Chart
- Chart A1 - No "Service Engine Soon" Light
- Chart A2 - No ALDL Data Or Won't Flash Code 12
- Chart A3 - Cranks, But Will Not Run (2.5L)
- Chart A3 - Cranks, But Will Not Run (All Except 2.5L)
- Chart A4 - Injector Circuit Diagnosis (2.5L)
- Chart A4 - Injector Circuit Diagnosis (All Except 2.5L)
- Chart A5 - Fuel Pump Relay ("M" Series, "S/T" Series)
- Chart A5 - Fuel Pump Relay (C, K, G, P W/Single Fuel Tank)
- Chart A5A - Fuel Pump Relay (R & V Series W/Dual Tanks)
- Chart A6 - Fuel System Pressure Test
- Code 13 - Oxygen (O2) Sensor Circuit
- Code 14 - Coolant Temperature Sensor
- Code 15 - Coolant Sensor Circuit Signal Voltage High
- Code 21 - Throttle Position Sensor (TPS) Signal Voltage High
- Code 22 - Throttle Position Sensor (TPS) Signal Voltage Low
- Code 23 - Mat Sensor Voltage High (2.5L)
- Code 24 - Vehicle Speed Sensor (VSS)
- Code 25 - Manifold Air Temp Sensor Voltage Low (2.5L)
- Code 32 - EGR System Failure (1 Of 2)
- Code 32 - EGR System Failure (2 Of 2)
- Code 33 - Map Sensor Signal Voltage High
- Code 34 - Map Sensor Signal Voltage Low
- Code 35 - Idle Speed Error (2.5L)
- Code 42 - Electronic Spark Timing
- Code 43 - Electronic Spark Control (2.8L/4.3L/5.0L/5.7L)
- Code 44 - Lean Exhaust Indication
- Code 45 - Rich Exhaust Indication
- Code 51 - Faulty Mem-Cal (2.5L)
- Code 51 - Prom Problem (2.8L/4.3L/5.0L/5.7L/7.4L)
- Code 52 - Fuel CALPAK Missing (2.8L/4.3L/5.0L/5.7L/7.4L)
- Code 53 - System Over Voltage (2.5L)
- Code 54 - Fuel Pump Circuit (Low Voltage)
- Code 55 - ECM Problem (2.8L/4.3L/5.0L/7.4L)
- Map Output Check
- Park/Neutral Switch Diagnosis
- Crank Signal Diagnosis
- Power Steering Pressure Switch (2.5L)
- A/C Clutch Control Diagnosis (2.5L) (1 Of 2)
- A/C Clutch Control Diagnosis (2.5L) (2 Of 2)
- A/C Clutch Control Diagnosis (2.8L) (1 Of 2)
- A/C Clutch Control Diagnosis (2.8L) (2 Of 2)
- ECM QDR (Quad-Driver) Check
- A/C "On" Signal Diagnosis (4.3L/5.0L/5.7L/7.4L)
- Idle Speed Error (2.8L/4.3L/5.0L/5.7L/7.4L)
- Ignition System Check (Remote Coil) (2.5L "S/T")
- Ignition System Check (Remote Coil) (Except 2.5L "S/T")
- Electronic Spark Control Check (Except 2.5L & 7.4L)
- Air Management Check (Electronic Air Control Valve)
- EGR System Check (2.5L/4.3L/5.0L/5.7L Under 8500 GVW)
- EGR System Check (2.8/4.3L "S/T" & 5.7/7.4L Over 8500 GVW)
- Torque Converter Clutch (TCC) Elect. Diagnosis (2.5L/2.8L)
- TCC Electrical Diagnosis (4.3/5.0/5.7L Under 8500 GVW)
- THM 400 Trans. Downshift Control Electrical Diagnosis
- Manual Transmission Shift Light Check
- Component Locations
- ECM Terminal Id
- 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.