On-Board Diagnostic II (OBD II) System

This vehicle is equipped with advanced diagnostic capabilities. The OBD II system is a much more complex system than the prior on-board diagnostics. The ECM interacts with many more emission related components/systems and monitors the emission related components/systems for deterioration. Most of these diagnostics will detect a problem before the customer notices a change in the driveability. Rather than waiting for a hard circuit/component failure, the OBD II diagnostics monitor system performance, and a Diagnostic Trouble Code (DTC) will set if the system performance is degraded.

The Malfunction Indicator Lamp (MIL) operation and the DTC storage are dictated by a DTC type. A DTC is ranked as a Type A or B if the DTC is emissions related. Type C is not emissions related. Each DTC type has an individual set of MIL operation, DTC storage and DTC clearing criteria.