System Description

WARNING: This page is about a different variant/trim than selected.

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 With 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.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P2757	Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU)	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, gear, etc.) Line pressure is too low	Comes on	DTC stored