On-Board Diagnostic System Description: Notes

For CVT control system, TCM has following functions.

• When the ignition switch is turned ON with the engine at a stop, 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 malfunction indicator lamp in the meter cluster 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 generic scan tool which are in compliance with SAE J1978. (Diagnostic information can be accessed by using a scan tool.)
  Fig 1: Identifying Malfunction Indication Lamp

  Courtesy of SUZUKI OF AMERICA CORP.
• For information about the following items, refer to OBD (ON-BOARD DIAGNOSTIC) SYSTEM DESCRIPTION :
  • Warm-up cycle
  • Driving cycle
  • 2 driving cycle detection logic
  • Pending DTC
  • Freeze frame data