Lexus ES300 (2002 year). Manual — part 121

CHASSIS – U150E AUTOMATIC TRANSAXLE

CH-13

211CH12

Solenoid Valve SL3

Solenoid Valve SLT

Solenoid Valve SL1

Upper Valve Body

Plate

Lower Valve
Body

Fluid Temperature
Sensor

Solenoid Valve DSL

Solenoid Valve S4

Solenold Valve SL2

Solenoid Valve SR

211CH13

Lock-up Relay Valve

Lock-up Control Valve

B

1

Control Valve

Secondary Regulator Valve

C

0

Control Valve

Solenoid
Modulator Valve

B

3

Orifice

Control Valve

B

2

Control Valve

C

1

Control Valve

Accumulator Control Valve

Solenoid Relay Valve

VALVE BODY UNIT

1. General

This valve body unit has been developed for the U150E A / T application.
The valve body consists of the upper and lower valve bodies and 7 solenoid valves.
Apply orifice control, which controls the flow volume to the B

3

brake, has been adopted in this unit.

Upper Valve Body

CHASSIS – U150E AUTOMATIC TRANSAXLE

CH-14

211CH14

4-5 Shift Valve

B

2

Apply Control Valve

B

1

Apply Control Valve

Primary Regulator Valve

Clutch Apply Control Valve

Lower Valve Body

CHASSIS – U150E AUTOMATIC TRANSAXLE

CH-15

198CH31

Sleeve

Solenoid Coil

Spool Valve

Hydraulic
Pressure

Current

2. Solenoid Valve

Solenoid Valves SL1, SL2, SL3 and SLT

1) General

In order to provided a hydraulic pressure that is proportion to current that flows to the solenoid coil, the
solenoid valve SL1, SL2, SL3, and SLT linearly controls the line pressure and clutch and brake
engagement pressure based on the signals it receives from the ECM.
The solenoid valves SL1, SL2, SL3, and SLT have the same basic structure.

2) Function of Solenoid Valve SL1, SL2, and SLT

Solenoid

Action

Function

Solenoid

Valve

Action

Function

SL1

B

1

brake pressure control

SL2

For clutch and brake engagement pressure
control

C

0

clutch pressure control

Lock-up clutch pressure control

SL3

C

1

clutch pressure control

SLT

For line pressure control

Line pressure control

Secondary pressure control

CHASSIS – U150E AUTOMATIC TRANSAXLE

CH-16

181CH12

Solenoid Valve ON

Solenoid Valve OFF

Control Pressure

Line
Pressure

Drain

161ES65

211CH34

Solenoid Valve DSL

Line Pressure

Solenoid Valve S4

Line Pressure

Solenoid Valve SR

Line Pressure

Solenoid Relay Valve

To Lock-up
Relay Valve

To B

2

Control Valve

To Clutch Apply
Control Valve
To 4-5
Shift Valve

Solenoid Valves SR, S4, and DSL

1) General

The solenoid valves SR, S4, and DSL use a three-way solenoid valve.

2) Function of Solenoid Valve SR

The solenoid valve SR controls the solenoid relay valve. Accordingly, the fluid passages from the
solenoid valve DSL and S4 have been changed.