CHECK HARNESS CONNECTOR BETWEEN LOCK-UP DUTY SOLENOID AND TRANSMISSION.

Measure the resistance of harness between transmission connector and transmission ground.

Connector & terminal

(T4) No. 12 — Transmission ground:

QUESTION

Is the resistance 1 MΩ or more?

Yes No

The circuit is normal.
If the ATF temperature warning light is flashing, repair the harness or connector between the lock-up duty solenoid and transmission.

Repair the short circuit of harness between lock-up duty solenoid and transmission connector.