Inspection/Maintenance (I/M) Misfire Monitoring System Set Procedure: Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The purpose of this procedure is to satisfy the enable criteria necessary to execute an Inspection/Maintenance (I/M) system monitor for the misfire monitoring system. The system monitor is comprised of the test results from one or more DTCs. This procedure may be used to set the Misfire Monitoring I/M System Status display on the scan tool to YES. The Misfire Monitoring I/M System Status display indicates whether or not the control module has completed the system monitor. The system monitor completes when either all DTCs comprising the monitor run and pass, or any DTC comprising the monitor illuminates the malfunction indicator lamp (MIL). If one of the DTCs comprising the monitor is set and the MIL is not illuminated, the necessary trips are required to illuminate the MIL before the monitor will complete. Once the monitor completes, the Misfire Monitoring I/M System Status display will be updated to YES.