Section 2 (Engine Controls - Tests W/Codes - Diesel)
WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1993 GMC Yukon, 1993 GMC Vandura Special, 1993 GMC Vandura, 1993 GMC Suburban, and 1993 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
- Diagnostic System Check (With Automatic Transmission)
- Diagnostic System Check (With Manual Transmission)
- Chart A-1, No Mil (Service Engine Soon) Light (With A/T)
- Chart A-1, No Mil (Service Engine Soon) Light (With M/T)
- A-2, No DLC Data, Mil (Service Engine Soon) Light On At All Times Or Will Not Flash DTC 12 (With A/T)
- A-2, Mil (Service Engine Soon) LT On At All Times Or Will Not Flash DTC 12 (With M/T)
- EPR Solenoid Electrical Check
- EPR Vacuum Circuit Check
- Diagnostic Trouble Code Charts
- DTC 12, No Reference Pulse (With Automatic Transmission)
- DTC 12, No Reference Pulse (With Manual Transmission)
- DTC 14, ECT Sensor - High Temperature Indicated (With A/T)
- DTC 14, ECT Sensor High Temperature Indicated (With M/T)
- DTC 15, ECT Sensor Low Temperature Indicated (With A/ T)
- DTC 15, ECT Sensor Low Temperature Indicated (With M/T)
- DTC 16, Trans. Output Speed Signal Voltage Low (A/T Only)
- DTC 21, Throttle Position Sensor Signal Voltage High (W/ A/T)
- DTC 21, Throttle Position Sensor Signal Voltage High (W/ M/T)
- DTC 22, Throttle Position Sensor Signal Voltage Low (W/ A/T)
- DTC 22, Throttle Position Sensor Signal Voltage Low (W/ M/T)
- DTC 23, Throttle Position Sensor MISADJUSTED
- DTC 24, Vehicle Speed Signal Low ("C" & "K" Series, M/T Only)
- DTC 24, Vehicle Speed Signal Low (With 4L60-E A/T)
- DTC 24, Vehicle Speed Signal Low (With 4L80-E A/T)
- DTC 31, Map Sensor Signal Voltage Low (W/ A/T)
- DTC 31, Map Sensor Signal Voltage Low (W/ M/T)
- DTC 32, EGR Circuit Loop Error ("C" & "K" Series)
- DTC 32, EGR Circuit Loop Error ("G" Series)
- DTC 33, Manifold Absolute Pressure Sensor Signal Voltage High
- DTC 51, Prom Problem
- DTC 52, ECM Fault
- DTC 53, Voltage Reference Overload (W/ A/T)
- DTC 53, Voltage Reference Overload (With Manual Transmission)
- DTC 72, Vehicle Speed Sensor Signal Loss