Monitored Circuits

The Powertrain Control Module (PCM) contains electronic circuit monitors that monitor fuel, vehicle emissions, engine and ignition system performance. Monitors use information from various sensor circuits for system monitoring. Monitors do not indicate a specific component failure, but do indicate an implied failure within a specified system, and that the problem must be diagnosed. If any monitor detects a problem affecting vehicle emissions, a Diagnostic Trouble Code (DTC) will be set in PCM after 2 consecutive trips with the malfunction present. For additional information for trip definition, see TRIP DEFINITION  . The following monitors are used.

• Engine Misfire Monitor
• Fuel System Monitor
• Oxygen Sensor Monitor
• Oxygen Sensor Heater Monitor
• Catalyst Monitor
• EVAP System Leak Detection Monitor

The PCM will erase or clear DTC once MIL is turned off. For additional information for DTC erasure, see DTC PRIORITY & DTC SELF-ERASURE  .