Section 8 (Engine Controls - Tests W/Codes - Diesel)
WARNING: This page does not describe the selected car, but rather 22 other vehicles, including the 1992 GMC Yukon, 1992 GMC Vandura Special, 1992 GMC Vandura, 1992 GMC Value Van, and 1992 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Self-Diagnostic System
- Diagnostic Charts
- Notes
- Diagnostic Circuit Check
- Service Engine Soon Light Inoperative
- ECM Check, Service Engine Soon Light On At All Times Or Won't Flash Code 12
- EPR Solenoid Electrical Check
- EPR Vacuum Circuit Check
- Code 12, No Reference Pulse
- Code 14, Coolant Temperature Sensor Signal Voltage Low
- Code 15, Coolant Temperature Sensor Signal Voltage High
- Code 21, Throttle Position Sensor Signal Voltage High
- Code 22, Throttle Position Sensor Signal Voltage Low
- Code 23, Throttle Position Sensor MISADJUSTED
- Code 24, Vehicle Speed Sensor Circuit
- Code 31, Map Sensor Signal Voltage Low
- Code 32, EGR Circuit Loop Error
- Code 33, Map Sensor Signal Voltage High
- Code 51, Prom Problem
- Code 52, ECM Fault
- Code 53, Voltage Reference Overload