Circuit 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.

(*) 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 To Current Flow Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Duty Ratio Graph

Fig 3: Torque Converter Clutch Pressure Control Solenoid Control Circuit Description