lock LEXUS SC400 1991 Service Manual PDF

SHIFT POINT (Kick±down foot switch deactivated)
 Shift position Shifting point Vehicle speed km/h (mph) 


 

Throttle valve fully opened 1
"2
 

67±71 (42±44)
  2
" 3 118±124 (73±77)
  3" O/D 155±161 (96±100)
 D position O/D "3 128±134 (79±83)
 
D osition
(NORM) 3" 2 71±75 (44±47)
  2" 1 10±13 (6±8)
  Throttle valve fully closed 3 "O/D 32±35 (20±22)  O/D "3 23±26 (14±16) 


 

Throttle valve fully opened 1
"2
 

67±71 (42±44)
  2
" 3 118±124 (73±77)
  3" O/D 179±186 (111±116)
 D position O/D "3 149±155 (93±96)
 
D osition
(PWR) 3" 2 95±100 (59±62)
  2" 1 22±26 (14±16)
  Throttle valve fully closed 3 "O/D 32±35 (20±22)  O/D "3 23±26 (14±16) 

2 iti
 

Throttle valve fully opened 1
"2
 

67±71 (42±44)
 2 position
(NORM or PWR) 3
" 2 106±112 (66±70)
 
(NORM or PWR)
 2" 1 10±13 (6±8)
 L position Throttle valve fully opened 3 "2 104±109 (65±68)
 
L osition
(NORM or PWR) 2" 1 57±63 (35±39)
LOCK±UP POINT
 


D position km/h (mph)
Throttle valve opening 5% 

Lock±up ON
 

Lock±up OFF
 3rd Gear (O/D switch OFF) 83±88 (52±55) 77±82 (48±51)
 O/D Gear 56±60 (35±37)1 53±57 (33±35)
AT±122±
A340E (1UZ±FE) AUTOMATIC TRANSMISSION SERVICE SPECIFICATIONS
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DESCRIPTION
GENERAL DESCRIPTION
AT0GE±02
The A340E automatic transmission is a 4±speed Electronically Controlled \
Transmission with an intelligent
control like the A341E automatic transmission used in the LS400. The A34\
0E automatic transmission has
the following features.

When shifting, engine torque is controlled and the clutch hydraulic pressure\
in the transmission is
electronically controlled to reduce transmission shift shock.

A new type of ATF (ATF Type T±II) is used which provides improved shifting characteristics a\
nd
prevents deterioration in the ATF over time.
HINT: For the A340E automatic transmission, use ATF Type T±II or equivalent.

A super flow torque converter clutch is used to improve the transmission\
efficiency.
The A340E automatic transmission is mainly composed of a torque converter c\
lutch with lock±up clutch,
4±speed planetary gear unit, hydraulic control system and the electro\
nic control system.
To minimize the possibility of incorrect operation of the automatic transm\
ission, a shift lock mechanism has
also been added.
AT±2
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION DESCRIPTION
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Type of Transmission  A340E
\
 \
Type of Engine61UZ±FE
\
 
\

\
Torque Converter Clutch Stall Torque Ratio1.900 :1
\
 \
Torque Converter Clutch Lock±up MechanismEquipped
 Gear Ratio 1st Gear 2.804
  2nd Gear 1.531 


 

3rd Gear
 

1.000
  O/D Gear 0.705
  Reverse Gear 2.393
 
Number of Discs/Plates 
O/D Direct Clutch (C0) 
2 / 2 


 

Forward Clutch (C1)
 

6 / 6
  Direct Clutch (C2) 4 / 4
  2nd Brake (B0) 5 / 5 


 

1st & Reverse Brake (B2)
 

7 / 7
  O/D Brake (B0) 5 / 4
 2nd Coast Brake (B) Band Width mm (in.) 40 (1.57)
 ATF TypeATF Type T±II or equivalent 

Capacity liter (US qts, lmp. qts)
 

Total
 

8.2 (8.7, 7.2)
  Drain & Refill 1.9 (2.0, 1.7)
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION DESCRIPTIONAT±3
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2. HYDRAULIC CONTROL SYSTEMThe hydraulic control system is composed of the oil pump, the valve body, the solenoid valves, the accumu-
lators, the clutches and brakes, as well as the fluid passages which connect al\
l of these components.
Based on the hydraulic pressure created by the oil pump, the hydraulic control system governs the hydrau-
lic pressure acting on the torque converter clutch, clutches and brakes \
in accordance with the vehicle driv-
ing conditions.
There are 4 solenoid valves on the valve body.
The No.1 and No.2 solenoid valves are turned on and off by signals from the ECM to operate the shift
valves, and change the gear shift position.
The No.3 solenoid valve is operated by signals from the ECM to engage or di\
sengage the lock±up clutch
of the torque converter clutch.
The No.4 solenoid valve is operated by signals from the ECM to control the \
engagement speed and reduce
gear shift shock.
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION OPERATIONAT±7
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3. ELECTRONIC CONTROL SYSTEMThe electronic control system for the A340E automatic transmission provides\
extremely precise control of
the gear shift timing and lock±up timing in response to driving conditio\
ns as sensed by various sensors
located throughout the vehicle and in response to the engine's running condition.
At the same time, the ECM control reduces vehicle squat when the vehicle s\
tarts out and gear shift shock.
The electronic control system is also equipped with a self diagnosis sys\
tem which diagnoses malfunctions
of electronically controlled components and warns the driver, and a fail±safe system which makes it pos-
sible for the vehicle to continue functioning when a malfunction occurs.
CONSTRUCTION The electronic control system can be broadly divided onto 3 groups; the \
sensors, ECM and actuators.
AT±8±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION OPERATION
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ON±VEHICLE REPAIR
AT06Y±04
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the ªLOCKº posi-
tion and the negative (±) terminal cable is disconnected
from the battery.
EXTENSION HOUSING
EXTENSION HOUSING REAR OIL SEAL
REPLACEMENT
AT0QW±01
1. DRAIN ATF
2. REMOVE FRONT EXHAUST PIPE AND HEAT INSULATOR
(See pages EG±204)
3. REMOVE PROPELLER SHAFT (See pages PR±6)
4. REMOVE TRANSMISSION OUTPUT FLANGE
(a) Using a hammer and chisel, loosen the staked part of the nut.
HINT: Shift the shift lever to the P position.
(b) Using SST, remove the nut.
SST 09060±20100
(c) Tap the output flange with a plastic hammer to remove it and 2 washers.
(d) Using a screwdriver, remove the oil seal from the output flange.
5. REMOVE EXTENSION HOUSING REAR OIL SEAL Using SST, remove the oil seal.
SST 09308±00010
AT±14
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION EXTENSION HOUSING
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PARK/NEUTRAL POSITION (PNP)
SWITCH
PARK/NEUTRAL POSITION SWITCH
REPLACEMENT
AT073±04
1. REMOVE FRONT EXHAUST PIPE(See pages EG±204)
2. DISCONNECT PARK/NEUTRAL POSITION SWITCH CONNECTOR
3. REMOVE PARK/NEUTRAL POSITION SWITCH
(a) Remove the control shaft lever.
(b) Pry off the lock washer and remove the nut.
(c) Remove the bolt and pull out the park/neutral position switch.
4. INSPECT PARK/NEUTRAL POSITION SWITCH
(See page AT±106)
5. INSTALL AND ADJUST PARK/NEUTRAL POSITION SWITCH
(See page AT±49)
6. CONNECT PARK/NEUTRAL POSITION SWITCH
CONNECTOR
7. INSTALL FRONT EXHAUST PIPE (See page EG±204)
KICK±DOWN SWITCH
KICK±DOWN SWITCH REPLACEMENT
AT074±04
1. REMOVAL OF KICK±DOWN SWITCH
(a) Remove the 3 bolts and kick±down switch.
(b) Disconnect the kick±down switch connector.
2. INSTALLATION OF KICK±DOWN SWITCH
(a) Connect the kick±down switch connector.
(b) Install the kick±down switch and 3 bolts.
AT±18
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION KICK±DOWN SWITCH
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7. REMOVE 4 SOLENOID VALVES
(a) Remove the No. 1 and No.2 solenoid valves.
(b) Remove the O±rings from the No. 1 and No.2 solenoidvalves.
(c) Remove the lock plate and No.3 and No.4 solenoid valves.
8. REMOVE THROTTLE CABLE Disconnect the throttle cable from the cam.
9. REMOVE VALVE BODY
(a) Remove the 20 bolts.
(b) Remove the valve body.
NOTICE: Do not drop the check ball body and spring.
10. INSPECT VALVE BODY Refer to `94 A340E and A341E Automatic Transmission Re-
pair Manual (for LEXUS SC400)
AT±20
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION VALVE BODY
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ASSEMBLY REMOVAL AND INSTALLATION
AT0GJ±02
Remove and install the parts, as shown.
NOTICE: Work must be started after 90 seconds from the time the ignition switch i\
s turned to the ªLOCKº
position and the negative (±) terminal cable is disconnected from t\
he battery.
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION ASSEMBLY REMOVAL AND INSTALLATIONAT±23
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TORQUE CONVERTER CLUTCH
CLEANING
AT079±04
If the transmission is contaminated, the torque converter
clutch and transmission cooler should be thoroughly flushed
with ATF.
TORQUE CONVERTER CLUTCH AND
DRIVE PLATE INSPECTION
AT00J±01
1. INSPECT ONE±WAY CLUTCH
(a) Install SST so that it fits in the notch of the converter hub and
outer race of the one±way clutch.
SST 09350±30020 (09350±32020)
(b) Press on the serrations of starter with a finger and rotate it. Check if it rotates smoothly when turned clockwise and locks
up when turned counterclockwise.
2. MEASURE DRIVE PLATE RUNOUT AND INSPECT RING GEAR
Set up a dial indicator and measure the drive plate runout.
If runout exceeds 0.20 mm (0.0079 in.) or if the ring gear is
damaged, replace the drive plate. If installing a new drive
plate, note the orientation of spacers and tighten the bolts.
Torque: 98 N Vm (1,000 kgf Vcm, 72 ft Vlbf)
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION ASSEMBLY REMOVAL AND INSTALLATIONAT±25
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