Page 25 of 2389

NOMENCLATURE
OPERATION
Forward Clutch
C
1Connects input shaft and front planetary ring gear
Direct Clutch
C
2Connects input shaft and front & rear planetary sun gear
2nd Coast Brake
B
1Prevents front & rear planetary sun gear from turning either clockwise or counterclockwise
2nd Brake
B
2Prevents outer race of F1 from turning either clockwise or counterclockwise, thus preventing front &
rear planetary sun gear from turning counterclockwise
1st & Reverse Brake
B
3Prevents rear planetary carrier from turning either clockwise or counterclockwise
No. 1 One-Way Clutch
F
1When B2 is operating, prevents front & rear planetary sun gear from turning counterclockwise
No. 2 One-Way Clutch
F
2Prevents rear planetary carrier from turning counterclockwise
O/D Direct Clutch
C
0Connects overdrive sun gear and overdrive-planetary carrier
O/D Brake
B
0Prevents overdrive sun gear from turning either clockwise or counterclockwise
O/D One-Way Clutch
B
0When transmission is being driven by engine, connects overdrive sun gear and overdrive carrier
Planetary GearsThese gears change the route through which driving force is transmitted in accordance with the
operation of each clutch and brake in order to increase or reduce the input and output speed
AT3207
Rear Planetary CarrierFront Planetary Ring Gear OUT O/D Planetary Sun GearINInput Shaft Shaft O/D Planetary CarrierIntermediateFront Planetary Carrier Rear Planetary
Ring Gear O/D Planetary Ring Gear
and Counter Drive Gear
FUNCTION OF COMPONENTS
Front and Rear Planetary Sun Gear
AT-6- AUTOMATIC TRANSAXLEOperation
Page 26 of 2389
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
Page 27 of 2389

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
Page 28 of 2389

COMPONENT PARTS
General Notes
The instructions here are organized so that you work on only one component group at a time.
This will help avoid confusion from similar-looking parts of different subassemblies being on
your workbench at the same time.
The component groups are inspected and repaired from the converter housing side.
As much as possible, complete the inspection, repair and assembly before proceeding to the
next component group. If a component group can not be assembled because parts are being or-
dered, be sure to keep all parts of that group in a separate container while proceeding with disas-
sembly, inspection, repair and assembly of other component groups.
Recommended fluid for the automatic transaxle: A540E ATF DEXRON II
A540H ATF Type T or equivalent
Recommended oil for the transfer: Transaxle oil E50, API GL5, SAE 75W-90 or equivalent
GENERAL CLEANING NOTES:
1. All disassembled parts should be washed clean, with any fluid passages and holes blown
through with compressed air.
2. When using compressed air to dry parts, always aim away from yourself to prevent acciden-
tally spraying automatic transaxle fluid or kerosene in your face.
3. The recommended automatic transaxle fluid or kerosene should be used for cleaning.
PARTS ARRANGEMENT:
1. After cleaning, the parts should be arranged in proper order to allow efficient inspection,
repairs, and reassembly.
2. When disassembling a valve body, be sure to keep each valve together with the corre-
sponding spring.
3. New brakes and clutches that are to be used for replacement must be soaked in transaxle
fluid for at least fifteen minutes before assembly.
GENERAL ASSEMBLY:
1. All oil seal rings, clutch discs, clutch plates, rotating parts, and sliding surfaces should be
coated with transmission fluid prior to reassembly.
2. All gaskets and rubber O-rings should be replaced.
3. Make sure that the ends of a snap ring are not aligned with one of the cutouts and are
installed in the groove correctly.
4. If a worn bushing is to be replaced, the subassembly containing that bushing must be re-
placed.
5. Check thrust bearings and races for wear or damage. Replace if necessary.
6. Use petroleum jelly to keep parts in place.
- AUTOMATIC TRANSAXLEComponent Parts (General Notes)AT-39
Page 29 of 2389
r Non-reusable partAT3606
Snap Ring Cover E-Ringr O-Ring Piston Oil Seal Ring Second Coast
Brake BandInner SpringPlate Washer PinPiston Rod Outer Spring
AT7703 AT7702
Second Coast Brake
COMPONENTS
DISASSEMBLY OF SECOND COAST BRAKE
PISTON
1. REMOVE OIL SEAL RING
Remove the oil seal ring from the piston.
2. REMOVE PISTON ROD
(a) Remove the E-ring while pushing the piston with
needle-nose pliers.
AT-40- AUTOMATIC TRANSAXLEComponent Parts (Second Coast Brake)
Page 30 of 2389
AT7704
Piston RodInner Spring Plate Washer
AT7705
AT7704
AT7706AT3607
Printed Mark
(b) Remove the inner spring, plate washer and piston
rod.
INSPECTION OF SECOND COAST BRAKE
COMPONENT
If the lining of the brake band is exfoliated or discolored,
or even part of the printed marks is defaced, replace the
brake band.
ASSEMBLY OF SECOND COAST BRAKE
PISTON
1. SELECT PISTON ROD
If the band is OK but piston stroke not within the standard
value, select the piston rod.
Piston stroke: 2.0 - 3.5 mm (0.079 - 0.138 in.)
There are two lengths of piston rod.
Piston rod length: 95.2 mm (3.748 in.)
96.3 mm (3.791 in.)
2. INSTALL PISTON ROD
(a) Install the plate washer and inner spring to the
piston rod.
(b) Install the E-ring while pushing the piston.
- AUTOMATIC TRANSAXLEComponent Parts (Second Coast Brake)AT-41
Page 31 of 2389
AT7707
Less than
5 mm (0.20 in.)3. INSTALL OIL SEAL RING
(a) Apply ATF to the oil seal ring.
(b) Install the oil seal ring to the piston.
NOTICE: Do not spread the ring ends more than
necessary.
AT-42- AUTOMATIC TRANSAXLEComponent Parts (Second Coast Brake)
Page 32 of 2389
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