System Description

WARNING: This page is about a different car, the 2016 Toyota Highlander, 2015 Toyota Highlander, and 2014 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

The TCM uses signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor, intermediate (counter gear) speed sensor and crankshaft position sensor to help determine the engagement timing of the lock-up clutch. The TCM monitors the engagement of the clutch using the turbine (input) speed sensor, intermediate (counter gear) speed sensor and crankshaft position sensor.

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0741	Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)	When both of the following are detected (2-trip detection logic): Lock-up does not occur when requested. Transmission fluid pressure switch No. 3 is ON.	Shift solenoid valve SL remains closed Valve body is blocked Torque converter assembly Automatic transaxle (clutch, brake or gear etc.) Line pressure is too low	Comes on	DTC stored