Circuit Description

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

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.

*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

Fig 1: Lock-Up Operation Pressure And Current Flow To Solenoid Graph

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Fig 2: Duty Ratio In One Cycle

DTC CONDITION DETECTION CHART

DTC No.	DTC detection condition	Trouble Area
P2759	The following condition is detected. (1-trip detection logic) SLU output signal's duty ON of 3.3 msec, or more with duty ratio of least 95% lasts for 1 second.	Open or short in shift solenoid valve SLU circuit Shift solenoid valve SLU ECM