Supra L6-2997cc 3.0L DOHC MFI (1998)
Throttle Valve Solenoid: Description and Operation
Linear Solenoid For Line Pressure Control Circuit
CIRCUIT DESCRIPTION
The throttle pressure that is applied to the primary regulator valve (which modulates line pressure) causes the solenoid valve SLT, under electronic
control, to precisely and minutely modulate and generate line pressure according to the accelerator pedal effort, or engine power output detected.
This reduces the fluctuation of line pressure and provides smooth shifting characteristics.
Upon receiving the throttle valve opening angle signal, ECM controls the line pressure by sending a predetermined (*) duty ratio to the solenoid
valve SLT located in the valve body, activating in the valve body, modulating the line pressure, generating throttle pressure.
(*) 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(%)
