System Description

WARNING: This page is about a different car, the 2013 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

The ECM uses the signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor, output speed sensor and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.

Fig 1: Identifying Shift Solenoid Valve SLU Components And Hydraulic Line Pressure Graph

The ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect shift solenoid valve SLU, valve body and torque converter clutch mechanical problems.

DTC No.	DTC Detection Condition	Trouble Area
P2757	Lock-up does not occur when requested. Lock-up occurs when shift solenoid valve SLU is requested to turn on in the lock-up range. (2-trip detection logic)	Shift solenoid valve SLU remains open or closed Valve body is blocked Torque converter assembly Automatic transaxle (clutch, brake or gear, etc.) Line pressure is too low