Section 6 (Engine Controls - Tests W/Codes - Diesel): Introduction
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.
The 6.2L light duty emission Diesel Electronic Control (DEC) system, electronically controls EGR system operation, Torque Converter Clutch (TCC) engagement, cold advance and glow plug operation.
Most engine control problems are NOT computer related, but result from mechanical breakdowns, poor electrical connections, or damaged vacuum hoses. Before condemning the computer system, carefully perform visual and mechanical inspections. Failure to perform these inspections can result in lost diagnostic time.
NOTE:
Some models use a Powertrain Control Module (PCM) or Transmission Control Module (TCM). Unless stated otherwise, references to ECM also apply to PCM and TCM-equipped vehicles.