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 MANUALSCHEVROLET1993SPORTVAN G30, VAN PASSENGER, 7.4 NREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 24 (ENGINE CONTROLS - TESTS W/CODES - 6.5L DIESEL)
1993 Chevrolet Sportvan G30, Van Passenger, 7.4 N
Section 24 (Engine Controls - Tests W/Codes - 6.5L Diesel)
1993 Chevrolet Sportvan G30, Van Passenger, 7.4 NSECTION Section 24 (Engine Controls - Tests W/Codes - 6.5L Diesel)
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Rally Camper Special, 1994 GMC Rally, and 1994 GMC Forward Control. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Self-Diagnostic System
- Diagnostic Trouble Code Charts
- Notes
- Diagnostic System Check
- Chart A-1 - No Mil (Service Engine Soon Light)
- Chart A-2 - No Scan Data, Mil (SES) On At All Times Or Will Not Flash Mil
- Chart A-3 - Engine Cranks But Will Not Run
- EGR Control Pressure/BARO Sensor Output Check
- DTC 13 - Engine Shutoff Solenoid Circuit Fault
- DTC 14 - ECT Sensor Circuit Low (High Temperature Indicated)
- DTC 15 - ECT Sensor Circuit High (Low Temperature Indicated)
- DTC 16 - Vehicle Speed Signal Buffer Fault
- DTC 17 - High Resolution Circuit Fault
- DTC 18 - Pump Cam Reference Pulse Error
- DTC 19 - Crankshaft Position Reference Error
- DTC 21 - App No. 1 Circuit High (Models With Pcm)
- DTCS 21/22, TP Sensor Circuit High/Low (4L80-E With TCM)
- DTC 22 - App No. 1 Circuit Low (Models With Pcm)
- DTC 23 - Accelerator Pedal Pos (App) No. 1 CKT Range Fault
- DTC 25 - Accelerator Pedal Position (App) No. 2 Circuit High
- DTC 26 - Accelerator Pedal Position (App) No. 2 Circuit Low
- DTC 27 - Accelerator Pedal Pos (App) No. 2 CKT Range Fault
- DTC 29 - Glow Plug Relay Circuit Fault
- DTC 31 - EGR CNTRL Pressure/BARO Sensor CKT Low (High Vacuum)
- DTC 32 - EGR Circuit Error - "G" Series
- DTC 33 - EGR CNTRL Pressure/BARO Sensor CKT High (Low Vacuum)
- DTC 34 - Injection Timing Stepper (Its) Motor Circuit Fault
- DTC 35 - Injection Pulse Width Error (Response Time Short)
- DTC 36 - Injection Pulse Width Error (Response Time Long)
- DTC 41 - Brake Switch Circuit Fault - "G" Series
- DTC 41 - Brake Switch Circuit Fault - "P" Series
- DTC 42 - Fuel Temperature CKT Low (High Temp Indicated)
- DTC 43 - Fuel Temperature CKT High (Low Temp Indicated)
- DTC 44 - EGR Pulse Width Error - "G" Series
- DTC 45 - EGR Vent Error - "G" Series
- DTC 46 - Mil (Service Engine Soon Light) Circuit Fault
- DTC 47 - IAT Sensor Circuit Low (High Temperature Indicated)
- DTC 48 - IAT Sensor Circuit High (Low Temperature Indicated)
- DTC 49 - Mil (Service Throttle Soon Light) Circuit Fault
- DTC 51 - Prom Problem (Faulty Or Incorrect Prom)
- DTC 54 - Pcm Fuel Circuit Error
- DTC 56 - Injection Pump Calibration Resistor Error
- DTC 57 - Pcm 5-Volt Shorted
- DTC 61 - Turbo Boost Sensor CKT High - "P" Series
- DTC 62 - Turbo Boost Sensor CKT Low - "P" Series
- DTC 63 - Accelerator Pedal Position (App) No. 3 Circuit High
- DTC 64 - Accelerator Pedal Position (App) No. 3 Circuit Low
- DTC 65 - App No. 3 Circuit Range Fault
- DTC 71 - Set/Coast Switch Fault
- DTC 76 - Resume/ACCEL Switch Fault
- DTC 78 - WASTEGATE Solenoid Fault - "P" Series
- DTC 84 - Accelerator Pedal Position (App) Circuit Fault
- DTC 88 - TDC Offset Error
- TDC Offset Program Procedure
- DTC'S 91-98 - Cylinder Balance Fault
- DTC 99 - APP No. 2 (5-VOLT REFERENCE FAULT)
- 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.