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 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

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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 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)	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 OFF. When both of the following are detected (2-trip detection logic): Transmission fluid pressure switch No. 3 is ON when lock-up does not occur. Lock-up occurs when shift solenoid valve SLU is requested to turn on in the lock-up range.	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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P2757

Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU)

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 OFF.

When both of the following are detected (2-trip detection logic):

Transmission fluid pressure switch No. 3 is ON when lock-up does not occur.
Lock-up occurs when shift solenoid valve SLU is requested to turn on in the lock-up range.

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