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

2. LOCK-UP OPERATION
When the Engine Control Module (Engine And Electronically Controlled Transmission ECU) judges from each signal that Lock-Up operation conditions have been met, current flows from TERMINAL SL of the Engine Control Module (Engine And Electronically Controlled Transmission ECU) to TERMINAL 1 (5S-FE), 2 (7A-FE) of the Electronically Controlled Transmission Solenoids --> Ground, causing continuous 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 (Engine And Electronically Controlled Transmission ECU), and the Engine Control Module (Engine And Electronically Controlled Transmission ECU) operates and continuous to the Lock-Up solenoid is cut.

4. OVERDRIVE CIRCUIT
^ O/D Main SW ON
When the O/D main SW is turned ON (SW Point Is Open), a signal is input to TERMINAL 0D2 of the Engine Control Module (Engine And Electronically Controlled Transmission ECU), and Engine Control Module (Engine And Electronically Controlled Transmission ECU) operation causes gear shift when the conditions for overdrive are met.
^ O/D Main SW OFF
When the O/D Main SW is turned OFF (SW Point Is Closed), current through the O/D OFF indicator light flows through the O/D Main 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 (Engine And Electronically Controlled Transmission ECU) and Engine Control Module (Engine And Electronically Controlled Transmission ECU) operation prevents shift into overdrive.