Toyota Supra 1990 Manual page 496

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AUTOMATIC TRANSMISSION - Description

Aside from having an ECU which controls shifting based upon electrical speed and throttle opening

signals, the ECT is basically the same as a fully hydraulic controlled automatic transmission. The

ECT controls shifting in the following manner:

(Throttle Opening Signal)

(Vehicle Speed

,..--THROTTLE POSITION SENSOR------,

The throttle opening is sensed by the throttle

position sensor, which sends this data to the

ECU in the form of electrical signals.

-VEHICLE SPEED SENSOR - - - - - - - ,

The vehicle speed is sensed by the vehicle speed

sensor, which sends this data to the ECU in the

form of electrical signals.

ECU - - - - - - - - - - - - - - - - ,

The ECU determines the shift timing on the

basis of the vehicle speed and throttle opening

signals, and operates the solenoid valves in the

hydraulic control unit, thus controlling the

movement of the shift valves. These valves in

turn control the fluid passage to the clutches

and brakes in the planetary gear unit, which

control the shifting of the transmission.

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