Toyota Supra User Booklet page 143

150
ii) During High Fluid Temperature Operation
In order to prevent an abnormal rise in the
fluid temperature,
temperature reaches a high level with the
shift lever in "D" and the pattern select
switch in manual mode, the ECM* [Engine
ECU] changes the shift program from
manual to normal mode, even if the pattern
select switch remains in the manual mode.
At the same time, the ECM causes the
"MANU" mode indicator light in the
combination meter to flash 5 times, and then
turn off.
* ECM (Engine Control Module)
3) Engine Torque Control
Engagement of the clutches and brakes of the planetary gear unit in the transmission is controlled smoothly by
momentarily reducing the engine torque when gears are shifted up or down in the transmission.
When the ECM* [Engine ECU] judges a gear shift timing according to signals from sensors such as the throttle
position and vehicle speed sensor, it activates the shift control solenoid valves to perform gear shifting. When
the gear shifting starts, the ECM* [Engine ECU] reduces the engine torque. As a result, engagement force of the
clutches and brakes of the planetary gear units is weakened and the gear shift change is performed smoothly.
An outline of the engine torque control is illustrated below.
CHASSIS — A340E AUTOMATIC TRANSMISSION
when the fluid