Lexus ES300 (2002 year). Manual — part 122
CHASSIS – U150E AUTOMATIC TRANSAXLE
CH-17
161ES23
Solenoid Valve S4
B
3
Accumulator
Line Pressure
S4 OFF
Except 4th: B
3
Brake ON
S4 ON
4th: C
3
Clutch ON
4-5 Shift Valve
C
3
Accumulator
C
3
B
3
211CH33
Line
Pressure
Solenoid Valve DSL
Solenoid Relay Valve
Lock-up Relay Valve
Line
Pressure
Lock-up ON
Chamber
Lock-up OFF
Chamber
B
2
Control Valve
“R”
“L”
B
2
3) Function of Solenoid Valve S4
The solenoid valves S4 when set to ON controls the 4-5 shift valve to establish the 5th by changing over
the fluid pressure applied to B
3
brake and C
3
clutch.
4) Function of Solenoid Valve DSL
The solenoid valve DSL controls the B
2
control valve via the solenoid relay valve when the transaxle
is shifted in the R or L position.
During lock-up, the lock-up relay valve is controlled via the solenoid relay valve.
CHASSIS – U150E AUTOMATIC TRANSAXLE
CH-18
157CH19
Line Pressure
Except 5th: B
3
Brake ON
B
3
Orifice
Control Valve
B
3
Apply Fluid Pressure
B
3
Accumulator
B
3
3. Apply Orifice Control
This control is effected by the B
3
orifice control valve. The B
3
orifice control valve has been provided for
the B
3
brake, which is applied when shifting from 5th to 4th. The B
3
orifice control valve is controlled by
the amount of the line pressure in accordance with shifting conditions, and the flow volume of the fluid that
is supplied to the B
3
brake is controlled by varying the size of the orifice in the control valve.
CHASSIS – U150E AUTOMATIC TRANSAXLE
CH-19
ELECTRONIC CONTROL SYSTEM
1. General
The electronic control system of the U150E automatic transaxle consists of the control listed below.
System
Function
U150E
U140E
Clutch Pressure
Control
Controls the pressure that is applied directly to B
1
brake
and C
2
clutch by actuating 2 solenoid valves (SL1, SL2)
in accordance with ECM signals.
2 solenoid valves (SL1 and SL2) minutely controls the
clutch pressure in accordance with the engine output and
driving conditions.
—
Control
(Refer to CH-24)
Controls the pressure that is applied directly to B
1
brake,
C
0
and C
1
clutches by actuating 3 solenoid valves (SL1,
SL2, and SL3) in accordance with ECM signals.
3 solenoid valves (SL1, SL2, and SL3) minutely controls
the clutch pressure in accordance with the engine output
and driving conditions.
—
Line Pressure
Optimal Control
(Refer to CH-26)
Actuates the solenoid valve SLT to control the line pressure
in accordance with information from the ECM and the
operating conditions of the transaxle.
Engine Torque
Control
Retards the engine ignition timing temporarily to improve
shift feeling during up or down shifting.
Shift Control in
Uphill / Downhill
Controls to restrict the 4th upshift or to provide appropriate
engine braking by the ECM to determine whether the
vehicle is traveling uphill or downhill.
—
Uphill / Downhill
Traveling
(Refer to CH-25)
Controls to restrict the 4th or 5th upshift or to provide
appropriate engine braking by the ECM to determine
whether the vehicle is traveling uphill or downhill.
—
Shift Timing Control
The ECM sends current to the solenoid valve SL1 and / or
SL2 based on signals from each sensor and shifts the gear.
—
Shift Timing Control
The ECM sends current to 3 solenoid valves (SL1, SL2, and
SL3) based on signals from each sensor and shifts the gear.
—
Lock-up Timing
Control
The ECM sends current to the solenoid valve DSL based on
signals from each sensor and engages or disengages the
lock-up clutch.
“N” to “D” Squat
Control
When the shift lever is shifted from “N” to “D” position, the
gear is temporarily shifted to 3rd and then to 1st to reduce
vehicle squat.
Diagnosis
When the ECM detects a malfunction, the ECM makes a
diagnosis and memorizes the failed section.
Diagnosis
(Refer to CH-27)
To increase the speed for processing the signals, the 32-bit
CPU of the ECM has been adopted.
—
Fail-safe
(Refer to CH-28)
Even if a malfunction is detected in the sensors or
solenoids, the ECM effects fail-safe control to prevent the
vehicle’s drivability from being affected significantly.
CHASSIS – U150E AUTOMATIC TRANSAXLE
CH-20
ECM
SENSORS
ACTUATORS
CRANKSHAFT
POSITION SENSOR
NE
SOLENOID VALVE SL1
SL1
SOLENOID VALVE SL2
SL2
SOLENOID VALVE SL3
SL3
SOLENOID VALVE SLT
SLT
SOLENOID VALVE S4
S4
SOLENOID VALVE DSL
DSL
SOLENOID VALVE SR
SR
MALFUNCTION
INDICATOR LAMP
W
DATA LINK CONNECTOR 3
SIL
TC
ENGINE COOLANT TEMP.
SENSOR
THW
THROTTLE POSITION SENSOR
VTA1
VTA2
PARK / NEUTRAL
POSITION SWITCH
NSW
R, D, 3, 2
TRANSAXLE CONTROL SWITCH
4, L
SPEED SENSOR
SKID CONTROL ECU
COMBINATION METER
SPD
COUNTER GEAR SPEED
SENSOR
NC
INPUT TURBINE SPEED SENSOR
NT
STOP LIGHT SWITCH
STP
FLUID TEMPERATURE SENSOR
THO
211CH19
2. Construction
The configuration of the electronic control system in the U150E automatic transaxle is as shown in the
following chart.
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