On-Board Diagnostic System Description

Engine Control Module (ECM) has the following function in compliance with OBD-II regulations:

• When ignition switch is turned to ON position with engine not running, Malfunction Indicator Light (MIL) turns ON to check of MIL bulb.
• When ECM detects a malfunction which gives an adverse effect to vehicle emission while engine is running, it makes MIL in instrument cluster turn ON or flash (flashing only when detecting a misfire which can damage to catalyst) and store malfunction Diagnostic Trouble Code (DTC) related to affected area in its memory (DTC according to SEA J2012).
• As a condition for detecting a malfunction in some areas in system being monitored by ECM and turning ON MIL due to that malfunction, 2 driving cycles detection logic is adopted to prevent erroneous detection.
• When a malfunction is detected, engine and driving conditions then are stored in ECM memory as freeze frame data. See FREEZE FRAME DATA  .
• It is possible to communicate via Data Link Connector (DLC) by using Suzuki scan tool. Also OBD-II generic scan tool which are in compliance with SEA J1978 (Diagnostic information can be accessed by using a scan tool).