Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - Transmission will not shift gears.

Possible Causes

- Low transmission fluid level - Dirty transmission fluid - Faulty shift solenoid E valve - Shift solenoid E valve harness or connectors - Shift solenoid E valve circuit is open or shorted

When Detected

The P0770 code is detected when Lock up does not occur when driving in the lock up range (normal driving at 80 km/h [50 mph]), or lock up remains ON in the lock up OFF range.

Tech Notes

There is a service bulletin for the following models: 2003 Toyota Corolla 2003 Toyota Matrix 2003 Toyota P0770 Service Bulletin

Description

The ECM uses the signals from the Throttle Position Sensor and Air flow Meter to monitor the engagement condition of the lock up clutch. Then the ECM compares the engagement condition of the lock up clutch with the lock up schedule in the ECM memory to detect mechanical trouble of the shift solenoid valve SLU, valve body, torque converter clutch and automatic transmission assembly