OBD-II Self-Diagnosis

• A/T self-diagnosis is performed by the TCM in combination with the ECM. Refer to the table on SDT FUNCTION (AT)  for the indicator used to display each self-diagnostic result.
• The self-diagnostic results indicated by the MIL are automatically stored in both the ECM and TCM memories.

  Always perform the procedure on  SDT FUNCTION (AT)   to complete the repair and avoid unnecessary blinking of the MIL. 

For details of OBD-III, refer to OBD SYSTEM: INTRODUCTION  (QR25DE), OBD SYSTEM: INTRODUCTION  (VQ40DE).

• Certain systems and components, especially those related to OBD, may use the new style slide-locking type harness connector. For description and how to disconnect  , refer to [HARNESS CONNECTOR: DESCRIPTION ].