engine LEXUS SC400 1991 Service Manual PDF

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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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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INSTALLATION MAIN POINTS
AT00L±01
1. CHECK TORQUE CONVERTER CLUTCH INSTALLATIONUsing calipers and a straight edge, measure from the
installed surface of the torque converter clutch to the front
surface of the transmission housing.
Correct distance:
17.1 mm (0.673 in.)
If the distance is less than the standard, check for an improp-
er installation.
2. LIFT ENGINE FRONT SIDE
3. INSTALL THROTTLE CABLE
4. ADJUST THROTTLE CABLE (See page AT±48)
5. FILL TRANSMISSION WITH ATF AND CHECK FLUID LEVEL
(See page AT±47)
NOTICE: Do not overfill.
Fluid type:
ATF Type T±II or equivalent
6. INSTALL PROPELLER SHAFT(See page PR±12 to PR±14 )
7. INSTALL EXHAUST PIPE
(See page EG±204)
AT±26
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION ASSEMBLY REMOVAL AND INSTALLATION
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MOON ROOF
Fitting Adjustments
(See page BO±83)
1. INSPECT SLIDING ROOF GLASS ALIGNMENT (a) Start the engine and check the operation time of thesliding roof.
Operation time: Approx. 5 secs.
(b) Check for abnormal noise or binding during operation.
(c) With th e slid in g ro o f fu lly clo se d , ch e ck fo r wa te rleakage.
(d) Check for a difference in level between the sliding roof weatherstrip and roof panel.
Front end: ±1 + 1 mm (±0.039 + 0.039 in.)
Rear end: 0
+ 1 mm (0 + 0.039 in.)
If the sliding roof does not operate:
(e) Remove the control switch cover.
(f) Remove the large screw inside.
NOTICE: Be careful not to lose the spring washer or
shim.
(g) Manually operate the moon roof by inserting a special crank±shaped screwdriver into the hole and turning the
drive shaft.
2. REMOVE SLIDING ROOF GARNISHES Before marking adjustments, remove the left and right sliding
roof garnishes.
HINT: After adjustment, reinstall the sliding roof gar-
nishes.
3. TO ADJUST LEVEL DIFFERENCE Adjust by increasing or decreasing the number of shims be-
tween the bracket and sliding roof.
4. TO ADJUST FORWARD OR REARWARD (a) Adjust by loosening the sliding roof installation nuts, andmove the sliding roof bracket forward and backward.
±
BODY Moon Roof (Fitting Adjustments)BO±81
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15. REMOVE CENTER PADUsing a screwdriver, pry out the panel and remove it.
HINT: Tape screwdriver tip before use.
16. REMOVE ENGINE HOOD RELEASE LEVER (a) Remove two screws and the engine hood release lever.
(b) Disconnect the release cable from the lever.
17. REMOVE NO. 1 LOWER FINISH PANEL (a) Using a screwdriver, remove the end pad.
HINT: Tape the screwdriver tip before use.
(b) Remove the bolt and two screws.
(c) Disconnect the connectors and remove the panel.
18. REMOVE COMBINATION SWITCH
19. REMOVE CLUSTER FINISH PANEL Pull out the panel and disconnect the connector.
20. REMOVE COMBINATION METER (a) Remove two caps.
(b) Remove two screws and the meter.
(c) Disconnect the connectors from the meter.
BO±112
±
BODY Instrument Panel
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Body Dimension Drawings
ENGINE COMPARTMENT
(Three±Dimensional Distance)
mm (in.)B06846
B06860
Symble
NameHole dia.SymbleNameHole dia.
A,aFront fender apron standard hole10 (0.39)L,lFront fender installation nut6 (0.24) screw
B,bFront spring support hole ± front11 (0.43)M,nHood hinge installation nut ± rear8 (0.31) screw
C,cCowl side panel standard hole10 (0.39)N,nFront fender installation nut ± rear6 (0.24) screw
DCowl top panel center mark'O,oHeadlight installation nut6 (0.24) screw
E,eFront side member working hole18 (0.71)P, pHeadlight installation nut6 (0.24) screw
F, fFront side member working hole18 (0.71)Q,qHeadlight installation nut6 (0.24) screw
G,gRadiator support standard hole10 (0.39)R,rHeadlight installation nut6 (0.24) screw
H,hRadiator support standard hole10 (0.39)S,sHeadlight installation hole11 (0.43)
I,iFront fender apron standard hole10 (0.39)T, tHeadlight installation hole10 (0.39)
J,jFront side member standard hole8 (0.31)U,uHeadlight installation hole10 (0.39)
K,kFront fender installation nut ± front6 (0.24) screw'''
BO±128±
BODY Body Dimensions (Body Dimension Drawings)
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REMOVAL OF FRONT BUMPER
(See page BO±11)
1. REMOVE FENDER SPLASH SHIELD Remove fourteen screws, a bolt and the shield.
2. REMOVE NO. 2 ENGINE UNDER COVER Remove seven screws, five bolts and the cover.
3. REMOVE HEADLIGHT (Low Beam)
(a) Remove two nuts, a bolt and the headlight.
(b) Disconnect the connectors.
4. REMOVE UPPER BUMPER RETAINER (a) Remove the hood seal.
(b) Remove five screws and the retainer.
5. REMOVE BUMPER COVER ASSY (a) Remove six clips.
BO±12
±
BODY Bumper (Front Bumper)
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2. REMOVE NO. 4 ENGINE UNDER COVER
3. REMOVE FRONT TRANSPORT HOOKRemove three bolts and the hook.
4. INSTALL FRONT TRANSPORT HOOK Install the hook with three bolts.
Torque: 64 N Vm (650 kgf Vcm, 47 ft Vlbf)
5. INSTALL NO. 4 ENGINE UNDER
6. INSTALL FENDER SPLASH SHIELD
Rear Transport Hook
REMOVAL AND INSTALLATION
(See page BO±27)
1. REMOVE SUPPORT Remove two bolts and the support.
2. REMOVE REAR TRANSPORT HOOK Remove two bolts and the hook.
3. INSTALL REAR TRANSPORT HOOK Install the hook with two bolts.
Torque: 64 N Vm (650 kgf Vcm, 47 ft Vlbf)
4. INSTALL SUPPORT
Install the support with two bolts.
BO±28
±
BODY Transport Hook (Front Transport Hook, Rear Transport Hook)
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2. REMOVE NO. 4 ENGINE UNDER COVER
3. REMOVE FRONT TRANSPORT HOOKRemove three bolts and the hook.
4. INSTALL FRONT TRANSPORT HOOK Install the hook with three bolts.
Torque: 64 N Vm (650 kgf Vcm, 47 ft Vlbf)
5. INSTALL NO. 4 ENGINE UNDER
6. INSTALL FENDER SPLASH SHIELD
Rear Transport Hook
REMOVAL AND INSTALLATION
(See page BO±27)
1. REMOVE SUPPORT Remove two bolts and the support.
2. REMOVE REAR TRANSPORT HOOK Remove two bolts and the hook.
3. INSTALL REAR TRANSPORT HOOK Install the hook with two bolts.
Torque: 64 N Vm (650 kgf Vcm, 47 ft Vlbf)
4. INSTALL SUPPORT
Install the support with two bolts.
BO±28
±
BODY Transport Hook (Front Transport Hook, Rear Transport Hook)
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