Transmission Control System

- A/T self-diagnosis is performed by the A/T control unit in combination with the ECM. The results can be read through the blinking pattern of the O/D OFF indicator or the Malfunction Indicator Lamp (MIL)
- The self-diagnostic results indicated by the MIL are automatically stored in both the ECM and A/T control unit memories.

NOTE: Always perform the procedure "How To Erase DTC" to complete the repair and avoid unnecessary blinking of the MIL.

- The following self-diagnostic items can be detected using ECM self-diagnostic results mode* only when the O/D OFF indicator lamp does not indicate any malfunctions.
1. Improper shifting to 1st, 2nd, 3rd, or 4th gear position.
2. Improper torque converter clutch operation.
3. Improper lock-up operation.

NOTE: Refer to Powertrain Management for details of OBD-II.