On-Board Diagnostic (OBD) System Description: Notes
ECM in this vehicle has the following functions.
- When the ignition switch is turned to ON position with the engine stopped, malfunction indicator lamp (MIL) (1) turns on in order to check the MIL (1) and its circuit.
- When ECM detects a malfunction which gives an adverse effect to vehicle emission more than specified driving cycle (D/C), it turns on or flashes MIL in the combination meter (flashing only when detecting a misfire which can cause damage to the catalyst) and stores the diagnostic trouble code (DTC) in its memory.
(If it detects normal condition for continuously 3 driving cycles after detecting a malfunction, it turns OFF MIL although DTC stored in its memory is remained as a history DTC.)
- For some malfunctions, ECM adopts the 2 D/C detecting logic to prevent erroneous detection. With this logic, MIL is turned on when the malfunction is detected in 2 consecutive driving cycles.
- When a malfunction is detected, engine and driving conditions at that moment are stored in ECM memory as freeze frame data.
For details, refer to description on FREEZE FRAME DATA .
- It is possible to communicate ECM via data link connector (DLC) (3) not only by SUZUKI scan tool (SUZUKI-SDT) (2) but also by CAN communication OBD generic scan tool.