1986 TOYOTA CAMRY V20 torque

AT3754
Electronic Control
SystemDifferential Hydraulic Control
SystemTorque
ConverterLock-up
Clutch 4-speed Planetary
Gear Unit
Sectional View
DESCRIPTION
GENERAL
(A540E)
The A540E is a 4-speed, Electronic Controlled Transaxle (hereafter called ECT) developed exclusively
for use with a transversely-mounted engine. A lock-up is built into the torque converter.
The A540E transaxle is mainly composed of the torque converter, the 4-speed planetary gear unit, the
differential, the hydraulic control system and the electronic control system.
AT-2- AUTOMATIC TRANSAXLEDescription

AT5032
(A540H)
The A540H automatic transaxle design is based on the A540E automatic transaxle and equipped with a
center differential and transfer.
This transaxle has the same hydraulic multiplate clutch in the center differential limiting control mecha-
nism as the A241H automatic transaxle on the Corolla All-Trac/4WD Station Wagon. The fluid pressure
acting on the hydraulic multiplate clutch of the A540H is controlled by the ECT ECU (Electronic Control
Unit) according to the vehicle driving conditions. As a result, torque is distributed to the front and rear
wheels appropriately at all times to maximize the overall performance of the 4WD vehicle.
NOTICE: Special handling methods are necessary for full-time 4WD vehicles during inspection and
maintenance. Instructions concerning these handling methods are given on Camry Repair Manual
(Pub. No. RM199U) on page IN-8.
Hydraulic Multiplate ClutchTransfer Front DifferentialCenter
Differential 4-Speed Planetary Gear
Unit and Hydraulic
Control SystemNo. 1 and No. 2 Center Differential
Control Solenoid ValveCenter Differential ControlECT
ECU No. 1 and No. 2 Shift Control
Solenoid Valves and Lock-up
Control solenoid ValveEngine ECU
Throttle Position
Sensor
Stop Light Switch
Vehicle Speed
Sensors
Mode Select Switch
Neutral Start Switch
O/D Main Switch
Center Deff. Control
Switch Shift Control Sectional View
Sensors
- AUTOMATIC TRANSAXLEDescriptionAT-3

Type of Transmission
A540E
A540H
Type of Engine
2VZ-FE
3S-FE
Torque ConverterStall Torque Ratio
1.9 : 1
2.0 : 1
Lock-Up Mechanism
Equipped
u
Gear Ratio1st Gear
2.810
u
2nd Gear
1.549
u
3rd Gear
1.000
u
O/D Gear
0.734
u
Reverse Gear
2.296
Number of Discs and
Plates (Disc/Plate)C
0O/D Direct Clutch
2/2
u
C
1Forward Clutch 4/4
u
C
2Direct Clutch 3/3
u
B
22nd Brake
3/3
u
B
3First & Reverse Brake 7/7 6/6
B
0O/D Brake
3/3
u
mm (in.)B1 Band Width
38 (1.50)
25 (0.98)
AT FType
ATF DEXRON
IIATF Type T or
equivalent
Capacity liter
(US qts, Imp. qts)A/T5.9 (6.2, 5.2)
7.0 (7.4, 6.2)
D/F1.0 (1.1, 0.9)
Transfer OilTypeTransaxle oil E50,
API GL5,
SAE 75W-90
or equivalent
Capacity liter (US qts, Imp. qts)
0.7 (0.7, 0.6)
General Specification
u
AT-4- AUTOMATIC TRANSAXLEDescription

AT1097
OUTIN
D or 2 Range 1st Gear
AT1102
OUTIN
2 Range 2nd Gear
AT1098
OUTIN
D Range 2nd Gear
AT1103
OUTIN
L Range 1st Gear
AT1099
OUTIN
D Range 3rd Gear
AT1101
OUTIN
R Range Reverse Gear
AT1100
OUTIN
D Range O/D Gear
Power from the engine transmitted to the input shaft via the torque converter is then transmitted to the
planetary gears by the operation of the clutch.
By operation of the brake and one-way clutch, either the planetary carrier or the planetary sun gear are
immobilized, altering the speed of revolution of the planetary gear unit.
Shift change is carried out by altering the combination of clutch and brake operation.
Each clutch and brake operates by hydraulic pressure; gear position is decided according to the throttle
opening angle and vehicle speed, and shift change automatically occurs.
The conditions of operation for each gear position are shown on the following illustrations:
- AUTOMATIC TRANSAXLEOperationAT-7

VALVE BODY
Hydraulic Control System

A540E, A540H
The hydraulic control system is composed of the oil pump, the valve body, the solenoid valves, the accu-
mulators, the clutches and brakes, and the governor valve as well as the fluid passages which connect all
of these components.
Based on the hydraulic pressure created by the oil pump, the hydraulic control system governs the hy-
draulic pressure acting on the torque converter, clutches and brakes in accordance with the vehicle driving
conditions.
There are three solenoid valves on the valve body.
The No. 1 and No. 2 solenoid valves are turned on and off by signals from ECU to operate the shift valves
and change the gear shift position.
The No. 3 solenoid valve is operated by signals from the ECU to engage or disengage the lock-up clutch
of the torque converter.

A540H
There are two center differential control solenoid valves on the transfer.
The solenoid valves are adjusting the center differential control pressure.
HYDRAULIC CONTROL SYSTEM
Hydr. pressure control
OIL PUMP
CLUTCHES & BRAKESFluid passage switchingPlanetary gear unit
Torque converter
Throttle Cable
SOLENOID VALVES
ECU
AT-8- AUTOMATIC TRANSAXLEOperation

AT4675r Non-reusable part70 (61 in.-lb, 6.9)kg-cm (ft-lb, N-m)Neutral Start Switch
55 (48 in.-lb, 5.4)
Manual Shift Leverr Lock Plate Elbow Snap Ring
275 (20, 27)Coverr O-Ring r O-Ring r O-RingPlug 2nd Coast
Brake Pistonr O-Ring Spring r O-Ring
275 (20, 27)
Union (A540E)No. 2 Speed Sensor
(A540E)
r O-Ring
275 (20, 27)
Elbow (A540H) Throttle Cabler GasketTransaxle Case
Upper Cover (A540H) r O-Ring r Gasket
275 (20, 27)
Union (A540H) Transaxle Case
Upper CoverBreather Hose
(A540H)
100 (7, 10) 200 (14, 20)
r O-Ring Solenoid WireBreather Tube (A540H) A540E and A540H
r O-Ring
: Specified torque
REMOVAL OF COMPONENT PARTS
COMPONENTS
- AUTOMATIC TRANSAXLERemoval of Component PartsAT-13

r Non-reusable part
kg-cm (ft-lb, N-m) : Specified torque
Drain Plug50 (43 in.-lb, 4.9)
r Gasket Oil Tube BracketOil Pan r Gasket Oil TubeMagnet Oil Tube
(A540H Only) CoverStrainer r GasketManual Valve
Body
100 (7, 10)
Retainer
r O-RingManual valve C
1 Accumulator
PistonConnector
Clamp B
2 Accumulator
PistonB3 Apply Tube Detent Spring r O-Ring
Spring Spring C
2 Accumulator
Pistonr Second Brake
Apply Gasket r O-RingValve BodyParking Lock Rod Springr Oil SealRetaining
Spring Pin Manual Valve
Shaftr CollarManual Valve Lever
A540E and A540H
r Gasket r O-Ring
r O-Ring
COMPONENTS (Cont'd)
AT4676
AT-14- AUTOMATIC TRANSAXLERemoval of Component Parts

kg-cm (ft-lb, N-m)
r Non-reusable part
: Specified torque
Parking Lock Pawl 2nd Coast Brake
Band Guide Snap RingBracket 1st and Reverse
Brake Pistonr Second Brake
Drum Gasket Snap Ringr GasketO/D Brake Drumr Gasket FlangeSnap RingSpringSnap RingO/D Planetary Gear
Springr O-Ring DiscBearing Snap RingRear Planetary
Gear
O/D Case250 (18, 25) 225 (16, 22)2nd Brake
DrumRear Planetary
Ring Gear Flange Plate Bearing
BearingDrum and
Sun Gear Bearing
PinBearingThrust
Washer Oil PumpThrust
WasherSecond Coast
Brake Band r O-RingDirect ClutchNo. 1 One-way
Clutch Thrust WasherFront Planetary
Ring Gear
A540E and A540H
PlateA540E: 7 pieces
A540H: 6 pieces
DiscA540E: 7 pieces
A540H: 6 piecesBearing No. 2 One-way
ClutchThrust
WasherThrust
Washer Forward Clutch
Front Planetary
Gear
COMPONENTS (Cont'd)
AT5020
- AUTOMATIC TRANSAXLERemoval of Component PartsAT-15