LEXUS SC400 1991 Service Repair Manual
Page 361 of 4087
SERVICE SPECIFICATIONS
SERVICE DATA
AT0GH±02 Line pressure (wheel locked)\
\
\
\
382±441 kPa 3.9±4.5 kgf/cm255±64 psi
Engine idling D position\
\
\
\
637±716 kPa 6.5±7.3 kgf/cm292±104 psi
R position\
\
\
1,265±1,402 kPa 12.9±14.3 kgf/cm2183±203 psi AT stall (Throttle valve opened) D position\
\
\
\
1,726±2,060 kPa 17.6±21.0 kgf/cm2250±298 psi R position\
\
ECM SLN termina lNot ground\
\
177±255 kpa 1.8±2.6 kgf/cm226±37 psi
Ground\
\
0
Engine stall revolution\
\
2,200+150 RPM
Time lag N position " D position\
\
Less than 1.2 seconds
N position " R position\
\
Less than 1.5 seconds
Engine idle speed (Cooling fan and A/C OFF
)N position\
\
650 RPM
\
\
Boot end face and inner cable stopper Throttle cable adjustment (Throttle valve fully closed)\
\
\
\
0±1 mm 0±0.04 in.
Torque converter clutch installing (Correct distance)\
\
17.1mm 0.673 in.
Drive plate runout Limit\
\
0.20 mm 0.0079 in.
SHIFT POINT (Kick±down foot switch activated)
Shift position Shifting point Vehicle speed km/h (mph)2
Throttle valve fully opened 1"2 67±71 (42±44)
2" 3 118±124 (73±77)
3" O/D (NORM) 170±177 (106±110)
3" O/D (PWR) 179±186 (111±116)
D position (NORM or PWR) O/D "3 164±170 (102±106)
3" 2 105±111 (65±69) 2" 1 53±57 (33±35)
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 53±57 (33±35)
L position Throttle valve fully opened 3 "2 104±109 (65±68)
L osition
(NORM or PWR) 2" 1 57±63 (35±39)
±
A340E (1UZ±FE) AUTOMATIC TRANSMISSION SERVICE SPECIFICATIONSAT±121
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Page 362 of 4087
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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Page 363 of 4087
TORQUE SPECIFICATION
AT07F±04\
\
Part tightened NVm kgf Vcm ft Vlbf\
\
\
Engine x Transmission
64
650
47
\
\
Rear mounting x Body 25 260 19
\
\
Rear mounting x Extension housing 25 250 18
\
\
Transmission housing x Transmission case 14 mm (0.55 in.) 34 345 25
\
\
17 mm (0.67 in.) 57 580 42
\
\
Extension housing x Transmission case 34 345 25
\
\
Valve body x Transmission case 10 100 7
\
\
Oil strainer 10 100 7
\
\
Oil pan 7.4 75 65 in.
Vlbf\
\
No.1 vehicle speed sensor 16 160 12\
\
\
No.2 vehicle speed sensor
5.4
55
48 in.
Vlbf
\
\
Solenoid wiring stopper plate 5.4 55 48 in. Vlbf
\
\
O/D direct clutch speed sensor 5.4 55 48 in. Vlbf
\
\
Transmission output flange 123 1,250 90
\
\
Throttle cable x Transmission case 5.4 55 48 in. Vlbf
\
\
Union 29 300 22
\
\
Cooler pipe union nut 34 350 25
\
\
Drive plate x Crankshaft 99 1,000 72
\
\
Torque converter clutch x Drive plate 33 340 25\
\
Park/Neutral position switch Bolt 13 130 9\
\
Nut 6.9 70 61 in. Vlbf\
\
\
Control shaft lever
16
160
12
±
A340E (1UZ±FE) AUTOMATIC TRANSMISSION SERVICE SPECIFICATIONSAT±123
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Page 364 of 4087
A340E (1UZ±FE)
AUTOMATIC TRANSMISSION
AT±1
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Page 365 of 4087
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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Page 366 of 4087
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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Page 367 of 4087
OPERATION
AT06S±04
AT±4±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION OPERATION
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Page 368 of 4087
*: Down±shift only 2nd gear in the L position and 3rd gear in the 2 position no up±\
shift
: Operating
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION OPERATIONAT±5
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Page 369 of 4087
1. FUNCTION OF COMPONENTS AT±6
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION OPERATION
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Page 370 of 4087
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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