System Outline

Previous Automatic Transmissions have selected each gear shift using mechanically controlled throttle hydraulic pressure, governor hydraulic pressure, and lock-up hydraulic pressure. The Electronically Controlled Transmission, however, electrically controls the line pressure, and lock-up pressure etc., Through the solenoid valve, The Engine Control Module (Engine and Electronic Controlled Transmission ECU) control of the Solenoid Valve based on the input signals from each Sensor which makes smooth driving possible by shift selection for each gear which is the most appropriate to the driving conditions at that time.

1. GEAR SHIFT OPERATION
During driving, the Engine Control Module (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) into TERMINAL THW of the Engine Control Module (ECU), and also the input signals to TERMINAL SP2 of the Engine Control Module (ECU) from the vehicle speed sensor (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 (ECU) --> TERMINAL A-3 (3VZ-E 4WD) or TERMINAL B-1 (3VZ-E 2WD, 22R-E) of the Electronically Controlled Transmission Solenoids --> TERMINAL C-1 (3VZ-2 2WD, 22R-E --> GROUND, and continuity to the no.1 Solenoid causes the shift.

For 2nd speed, the current flows from TERMINAL S1 of the Engine Control Module (ECU) --> TERMINAL A-3 (3VZ-E 4WD) or TERMINAL B-1 (3VZ-E 2WD, 22R-E) of the Electronically Controlled Transmission Solenoids --> TERMINAL C-1 (3VZ-E 2WD, 22R-E) --> GROUND, and from TERMINAL S2 of the Engine Control Module (ECU) --> TERMINAL A-2 (3VZ-E 4WD) or TERMINAL B-2 (3VZ-E 2WD, 22R-E) of the Electronically Controlled Transmission Solenoids --> TERMINAL C-1 (3VZ-E 2WD, 22R-E) --> 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 solenoid, causing the shift. Shifting into the 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 (ECU) judges from each signal that lock-up operation conditions have been met, current flows from TERMINAL S3 of the Engine Control Module (ECU) --> TERMINAL A-1 (3VZ-E 4WD) or TERMINAL B-3 (3VZ-E 2WD, 22R-E) of the Lock-Up Solenoid --> TERMINAL C-1 (3VZ-E 2WD, 22R-E) --> GROUND, causing continuity to lock-up Solenoid and causing Lock-Up operation.

3. TRANSFER SHIFT OPERATION
When the Transfer Shift Lever is moved to H4 position, the current from the GAUGE Fuse flows to the 4WD Indicator Light --> TERMINAL 2 of Add Indicator SW --> TERMINAL 1 --> TERMINAL A-2 (3VZ-E 4WD) or TERMINAL B-2 (22R-E 4WD) of the Indicator SW --> TERMINAL A-3 (3VZ-E 4WD) or TERMINAL B-1 (22R-E 4WD) --> GROUND so that the Indicator Light lights up and shift to H4 occurs.

If the Lever is next moved to L4 position, the Indicator Light operates the same as with H4, causing the Light to came ON. At the same time, a signal is input to TERMINAL L4 of the Engine Control Module (ECU). Accordingly, when the Engine Control Module (ECU) decides that driving in L4 is possible, current flows from TERMINAL S4 of the Engine Control Module (ECU) --> TERMINAL A-5 (3VZ-E 4WD) of the Electronically Controlled Transmission Solenoid --> GROUND and Shift to L4 occurs.

4. STOP LIGHT SW CIRCUIT
If the brake pedal is depressed (stop light SW ON) when driving in lock-up condition, a signal is input into TERMINAL STP of the Engine Control Module (ECU), the Engine Control Module (ECU) operates and continuity to the Lock-Up Solenoid is cut.

5. OVERDRIVE CIRCUIT
* O/D Main SW ON
When the O/D Main SW is turned ON a signal is input into TERMINAL OD2 of the Engine Control Module (ECU) and the Engine Control Module (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 to OFF, the 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 (ECU) and Engine Control Module (ECU) operation prevents shift into overdrive.

6. ELECTRONICALLY CONTROLLED TRANSMISSION PATTERN SELECT SW CIRCUIT
If the Electronically Controlled Transmission Pattern Select SW is changed from Normal to Power, the Current flowing through the Power Indicator flows to GROUND. Current flows to TERMINAL PWR of the Engine Control Module (ECU), the Engine Control Module (ECU) operates, and shift up and shift down occur at higher vehicle speeds than when the SW is in NORMAL position.

7. A/T OIL TEMP. WARNING
* Transmission Side
When the Oil Temp. Sensor affixed to the Transmission case detects that the Fluid temp. is 150° C (302° F) or more, the Engine Control Module (ECU) operates and the current flowing through the GAUGE Fuse flows to the A/T Oil temp. Warning Light --> TERMINAL OIL of the Engine Control Module (ECU) --> GROUND so that the Warning Light Lights up, informing that the Fluid temp. is high. When the Fluid temp. drops to 120° C (248° F) or less, the Engine Control Module (Engine and Electronically Controlled Transmission ECU) stops operating and the warning Light goes out.

* Transmission Side (22R-E)
When the Oil temp. Sensor affixed to the Transmission case detects that the Fluid Temp. is 150° C (302°F) or more, the TCCS ECU operates and the current flowing through the GAUGE Fuse flows to the A/T Oil temp. Warning Light --> TERMINAL 1 of the Oil Temp. SW --> GROUND so that the Warning Light lights up, informing that the Fluid Temp. is high. When the Fluid temp. drops to 120° (248° F) or less, the Engine Control Module (Engine and Electronically Controlled Transmission ECU) stops operating and the Warning Light goes out.

* Transfer Side (for 3VZ-E)
When the Transfer Fluid Temp. Sensor affixed to the transfer chain case detects that the fluid temp. is 125° C (257° F) or higher, the Engine Control Module (ECU) operates and the current flowing through the GAUGE Fuse flows to the A/T Oil Temp. Warning Light --> TERMINAL OIL of the Engine Control Module (ECU) --> GROUND so that the Warning Light lights up, informing that the Fluid Temp. is high. When the Fluid Temp. drops to 115° C (239° F) or less, the Engine Control Module (ECU) stops operating and the Warning Light goes out.