CVT

OBD System Description

For CVT control system, TCM has the following functions.

- When ignition mode of keyless push start system in "ON", MIL (1) turns ON to check the MIL and its circuit.
- When TCM detects a malfunction in CVT control system (and/or a malfunction which gives an adverse effect to vehicle emission) while the engine is running, TCM requires ECM to make the MIL in the combination meter of the instrument panel turn ON. TCM stores the malfunction area (DTC according to SAE J2012) in TCM memory.
(If it detects that continuously 3 driving cycles are normal after detecting a malfunction, however, it makes MIL turn OFF although DTC stored in its memory will remain.)
- Malfunctions detected by TCM are stored in its memory as pending DTC, confirmed DTC (current and history) and permanent DTC. The permanent DTC, among others, will be stored in the memory that cannot be manually erased. (For the details, refer to description on Permanent DTC
)

- It is possible to communicate through DLC (3) by using not only SUZUKI scan tool (2) but also CAN communication OBD-II generic scan tool which are in compliance with SAE J1978. (Diagnostic information can be accessed by using a scan tool.)





- For information about the following items, refer to OBD System Description OBD System Description.

- Warm-up cycle
- Driving cycle
- 2 driving cycle detection logic
- Pending DTC
- Freeze frame data

Permanent DTC

In accordance with SAE J1979, TCM stores DTCs that adversely affect vehicle emission (i.e. DTCs with MIL turning on) in a non-volatile RAM (NVRAM) separately from that for pending and confirmed DTCs. This DTC is called a permanent DTC.

Unlike pending and confirmed DTCs, the permanent DTC will not be cleared even when executing the clear command of scan tool or when shutting off the power to TCM. Only when does TCM detect no malfunction in the trouble area of the stored permanent DTC with the condition determined normal the permanent DTC will be cleared. (For permanent DTC clearance, refer to DTC Clearance DTC Clearance
)

The maximum of four earliest detections of the permanent DTCs will be stored in memory. The DTCs are cleared in the order of completing determination as normal.