On-Board Diagnostics: Notes

NOTE: Electronic Concentrated Control System (ECCS) control module is referred to as Engine Control Module (ECM).

ECM detects malfunctions related to engine sensors or actuators. OBD-II monitors emission related components and can store Diagnostic Trouble Codes (DTCs), 1st trip DTCs, freeze-frame data, 1st trip freeze-frame data and System Readiness Test (SRT) information. Using a scan tool, this data and DTC information can be retrieved to assist in diagnosing problems.