Each gear condition is explained using the solenoid valves and shift valves.
1. 1st gear
For gear shift from neutral to 1st gear, the fluid passage to C1 is opened by switching the manual valve. Since the No. 1 solenoid valve is on and the No. 2 solenoid valve is off, the fluid passage to C0 is opened. (No.1 solenoid valve is on, and No.2 solenoid valve is off.) The operation of C1 and F2 creates the fluid passage for 1st gear. In the “D” and “2” ranges, the engine brake is not applied because of the operation of F2. In the “L” range, the passage to B3 is opened and the engine brake is applied.
Hydraulic pressure to the planetary gear unit
C1 from manual valve
C0 from 3-4 shift valve
B3 from 2-3 shift valve
2. 2nd gear
The No. 2 solenoid valve is switched from off to on according to signals from the ECU. (No.1 solenoid valve is on, and No.2 solenoid valve is on.) The hydraulic pressure applied on the top of the 1-2 and 3-4 shift valves is discharged and the 1-2 shift valve is moved up by the force of the spring. Therefore, the fluid passage opens to B2. The operation of C1 and B2 (F1) shifts up to 2nd gear. In the “D” range, the engine brake is not applied because of the operation of F1. In the “2” range, the fluid passage to B1 is opened and the engine brake is applied.
Hydraulic pressure to the planetary gear unit
C1 from manual valve
C0 from 3-4 shift valve
B2 from 1-2 shift valve
B1 from 1-2 shift valve
3. 3rd gear
The No. 1 solenoid valve is switched from on to off according to signals from the ECU. (No.1 solenoid valve is off, and No.2 solenoid valve is on.) The hydraulic pressure starts to be applied on the top of the 2-3 shift valve, moving down the 2-3 shift valve. Therefore, the fluid passage opens to C2. The operation of C1 and C2 shifts the gear up to 3rd gear.
Hydraulic pressure to the planetary gear unit
C1 from manual valve
C0 from 3-4 shift valve
B2 from 1-2 shift valve
C2 from 2-3 shift valve
4. O/D gear
The No. 2 solenoid valve is switched from on to off according to signals from the ECU. (No.1 solenoid valve is off, and No.2 solenoid valve is off.) The hydraulic pressure starts to be applied on the top of the 1-2 and 3-4 shift valves, moving down the 3-4 shift valve. (The line pressure from the 2-3 shift valve is applied at the bottom of the 1-2 shift valve, so 1-2 shift valve does not move.) Therefore, the fluid passage that had been acting on C0 to B0 is switched and the gear is shifted up to the O/D gear. When the overdrive main switch is OFF, it cannot shift up to the O/D gear. Because the ECU does not send the signal to turn off the No.2 solenoid valve.
Hydraulic pressure to the planetary gear unit
C1 from manual valve
B0 from 3-4 shift valve
B2 from 1-2 shift valve
C2 from 2-3 shift valve
Description
The shift lever corresponds to the gear shift lever of the manual transaxle. The driver can select the driving mode – forward or reverse travel, neutral, and park – by operating this lever. There are the following types of shift levers. The shift lever used depends on the vehicle and grade.
1. Straight type
2. Column type
3. Gate type
4. Straight type with E-shift system
HINT:
The overdrive main switch may also be called the overdrive OFF switch or the transaxle (transmission) control switch. The E-shift type can shift the gear up or down with the transaxle/transmission shift switch.