System Outline

This system Electronically Controls the gear shift timing. Lock-Up timing, the clutch and brake hydraulic pressure, and the Engine Torque during shifting to achieve optimum shift feeling.
In according to the vehicle driving conditions and Engine operating conditions as detected by various sensors.

1. GEAR SHIFT OPERATION
During driving, the Engine Control Module selects the shift for each gear which is most appropriate to the driving conditions, based on input signal from the Engine Coolant Temp. Sensor to TERMINAL THW of the Engine Control Module, and also the input signals to TERMINAL SPD of the Engine Control Module from the speed sensor devoted to the Electronically Controlled Transmission. Current is then output to the Electronically Controlled Transmission Solenoid. When shifting to 1st speed, current flows from TERMINAL S1 of the Engine Control Module --> TERMINAL 3 of the Electronically Controlled Transmission Solenoid --> GROUND, and continuity to the No.1 solenoid causes the shift.
For 2nd speed. current flows from TERMINAL S1 of the Engine Control Module --> TERMINAL 3 of the Electronically Controlled Transmission Solenoid --> GROUND, and from TERMINAL S2 of the Engine Control Module --> TERMINAL 1 of the Electronically Controlled Transmission Solenoid --> GROUND, and continuity to solenoids No.1 and No.2 causes the shift.
For 3rd speed, there is no continuity to No.1 solenoid, only to No.2, causing the shift.
Shifting into 4th speed (Overdrive) takes place when there is no continuity to either No.1 or No.2 solenoid.

2. LOCK-UP OPERATION
When the Engine Control Module judges from each signal that lock-up operation conditions have been met, current flows from TERMINAL SL of the Engine Control Module --> TERMINAL 2 of the Electronically Controlled Transmission solenoid --> GROUND, causing continuity to the lock-up solenoid and causing lock-up operation.

3. STOP LIGHT SW CIRCUIT
If the brake pedal is depressed (Stop Light SW ON) when driving in lock-up condition, a signal is input to TERMINAL B/K of the Engine Control Module, the Engine Control Module operates and continuity to the lock-up solenoid is cut.

4. OVERDRIVE CIRCUIT
^ O/D SW ON
When the O/D SW is turned ON (O/D OFF Indicator Light Turns OFF), a signal is input to TERMINAL OD2 of the Engine Control Module and Engine Control Module operation causes gear shift when the conditions for overdrive are met.

^ O/D SW OFF
When the O/D SW is turned to OFF, the current flowing through the O/D OFF indicator light flows through the O/D SW to GROUND. Causing the Indicator light to light up. At the same time, a signal is input to TERMINAL OD2 of the Engine Control Module and Engine Control Module operation prevents shift into overdrive.