LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2002 >> Envoy 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Description & Operation >> Electronic Control System

Electronic Control System

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The PCM constantly monitors the information from various sensors and controls the systems that affect vehicle performance and emissions. The PCM also performs the diagnostic functions for those systems. The PCM can recognize operational problems and alert the driver through the Malfunction Indicator Lamp (MIL) when a malfunction has occurred. When a malfunction is detected, the PCM stores a Diagnostic Trouble Code (DTC) which helps to identify problem areas. This is done to aid the technician in making repairs.

scientia non olet · About LEMON Manuals