DTC P2759 Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve SLU): Description

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

The amount of current flow to the solenoid is controlled by the (*) duty ratio of the ECM output signal. The higher the duty ratio becomes, the higher the lock-up hydraulic pressure becomes during the lock-up operation.

Fig 1: Lock-Up Operation Pressure Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

(*) Duty Ratio

The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then Duty Ratio = A/(A+B) x 100(%).

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
P2759	Open or short is detected in shift solenoid valve SLU circuit for 1 second or more while driving (1 - trip detection logic).	Open or short in shift solenoid valve SLU circuit Shift solenoid valve SLU ECM

Reference (Using an oscilloscope):

Check the waveform between the terminals SLU+ and SLU- of the ECM connector

Fig 2: Identifying Signal Waveform

WAVEFORM REFERENCE

Terminal	SLU+ - SLU-
Tool setting	5 V/DIV., 1 ms./DIV.
Vehicle condition	5th (lock-up) or 6th (lock-up) gear