1. FORTUNER - Chassis Click a Section Tab
Contents
Click a Section Tab
Instructors

2. A34#E/F Automatic Transmission
VF4B Transfer
Differential
Suspension
Brake
Steering

3. A34#E/F Series Automatic Transmission
FORTUNER - Chassis
A34#E/F Series Automatic Transmission
Overall
Compact, lightweight, and high-capacity 4-speed A34#E/F series automatic transmission (ECT)
[Specifications]
Transmission Type
A343E/F
Engine Type
2TR-FE
Gear Ratios
1st
2.804
2nd
1.531
3rd
1.000
4th
0.753
Reverse
2.393
Fluid Capacity [Litter (US qts, lmp. qts)]
10.1 (10.7, 8.9)
Fluid Type
ATF Type T-IV
The basic construction and operation are the same as the HILUX (RZN149, 154 / KDN166)
Electrical key interlock device is used
Instructors

4. A34#E/F Series Automatic Transmission
FORTUNER - Chassis
A34#E/F Series Automatic Transmission
System Diagram
System diagram for Gasoline Engine
[Gasoline Engine Model]
Engine ECU
Transmission CPU
Engine CPU
Various Sensor for Engine Control System
Various Sensor for Transmission Control System
Injectors
Solenoid Valves
Combination Meter
• • •
DLC3
On the diesel engine models, engine ECU and transmission ECU are applied separately, which ECUs exchange information CAN communication
Instructors

5. A34#E/F Series Automatic Transmission
FORTUNER - Chassis
A34#E/F Series Automatic Transmission
Planetary Gear Unit
Gear train consists of the following clutches, brakes, one-way clutches and planetary gear sets B0 B2 B3 F2 C0 F0 F1 C1
Input
Output C2 B1
O/D Planetary Gear
Front Planetary Gear
Rear Planetary Gear
: Clutch
: Brake
: One-way Clutch
Instructors

6. A34#E/F Series Automatic Transmission
Planetary Gear Unit
Function of components
Component
Function C0
OD Direct Clutch
Connects OD planetary sun gear and OD planetary carrier C1
Forward Clutch
Connects input shaft and front planetary ring gear C2
Direct Clutch
Connects input shaft and front and rear planetary sun gear B0
OD Brake
Prevents OD planetary sun gear from turning either clockwise or counterclockwise B1
2nd Coast Brake
Prevents front and rear sun gear from turning either clockwise of counterclockwise B2
2nd Brake
Prevents outer race of F1 from turning either clockwise or counterclockwise, thus preventing front and rear sun gear from turning counter clockwise B3
1st and Reverse Brake
Prevents rear planetary carrier from turning either clockwise or counterclockwise F0
OD One-way Clutch
When engine power is transmitted to OD input shaft, connects OD planetary sun gear and planetary carrier F1
No. 1 One-way Clutch
When B2 is operating, prevents front and rear planetary sun gear from turning counterclockwise F2
No. 2 One-way Clutch
Prevents rear planetary carrier from turning counterclockwise

7. A34#E/F Series Automatic Transmission
Planetary Gear Unit
Operating condition
: Signal ON, X: Signal OFF, : Operation
Shift Lever Position
Gear
Shift Solenoid Valve
Clutch
Brake
One-way Clutch
No. 1
No. 2 C0 C1 C2 B0 B1 B2 B3 F0 F1 F2 P
Park   R
Reverse N
Neutral D
1st
2nd
3rd
4th 2 L
*1: After engaging, lock-up control is ON *2: After engaging, line pressure control is ON *3: After engaging, line pressure control is OFF

8. A34#E/F Series Automatic Transmission
Valve Body
Valve body consist following parts
Upper Valve Body
No. 2 Solenoid Valve
Lower Valve Body
No. 1 Solenoid Valve
Solenoid Valve SLT
Solenoid Valve SL

9. A34#E/F Series Automatic Transmission
Electronic Control System
Line pressure optimal control
Engine torque control
Shift timing control
Lock-up timing control
“N” to “D” squat control

10. 4WD (2TR-FE)
Overall
Full-time 4WD with a TORSEN LSD for center differential
Manual operation type
Center Diff Locked

11. 4WD (2TR-FE) 4WD Operation LL N HL H
Low (ratio:2.566) Lock, Center Diff. Locked N
Neutral, no engagement HL
High (ratio:1.000) Lock, Center Diff. Locked H
High (ratio:1.000), Center Diff. Free
For normal (urban) operation, always use “H” mode for better fuel economy and preventing “tight corner braking phenomenon”

12. 4WD (2TR-FE)
4WD Operation

13. 4WD (2TR-FE)
4WD Operation

14. 4WD (2TR-FE)
Service Points, Towing

15. 4WD (2TR-FE)
Service Points, Precautions

16. 4WD (2TR-FE)
Service Points, Speed Test

17. 4WD (2TR-FE)
Service Points, Wheel Balance

18. Single Pinion Planetary
FORTUNER - Chassis
VF4B Transfer
Overall
Full-time 2-speed type VF4B transfer with a TORSEN LSD for center differential
Manual operation type
TORSEN LSD
[Specifications]
Transfer Type
VF4B
Drive Type
Full-time
Gear Ratios H4
1.000 L4
2.566
Reduction Gear Type
Single Pinion Planetary
Center Differential
TORSEN LSD
Oil Capacity [Litter (US qts, lmp. qts)]
1.4 (1.5, 1.3)
Oil Viscosity
SAE 75W-90
Oil Grade
API GL-5
VF4B transfer is used for FORTUNER / HILUX SW4
Instructors

19. VF4B Transfer System Diagram Skid Control ECU Engine ECU A/T P
Center Diff. Lock Indicator Light
Engine ECU
A/T P
A/T P Warning Light (Only for ATM model)
Neutral Start Switch (Only for ATM model)
Neutral Start Switch (Only for ATM model)
L4 Position Switch
Center Diff. Lock Position Switch

20. VF4B Transfer Center Differential TORSEN LSD Components
FORTUNER - Chassis
VF4B Transfer
Center Differential
TORSEN LSD Components
Ring Gear Coupling
Pinion Gear
Differential Case
Sun Gear Coupling
Planetary Carrier
Clutch Plate No.4
Sun Gear
Clutch Plate No.2
Clutch Plate No.1
Ring Gear
Clutch Plate No.3
NOTE: Non-disassemble Part
Instructors

21. VF4B Transfer Center Differential TORSEN LSD Components
Clutch Plate No.1
Ring Gear
Clutch Plate No.2
Sun Gear Coupling
Ring Gear Coupling
Differential Case
Carrier Nut
Planetary Carrier
Thrust Plate
Clutch Plate No.4
Sun Gear
Clutch Plate No.3
Pinion Gear

22. VF4B Transfer Center Differential TORSEN LSD Normal driving
FORTUNER - Chassis
VF4B Transfer
Center Differential
TORSEN LSD
Normal driving
Fr: 40 Rr :60 % torque distribution ratio
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling
Instructors

23. VF4B Transfer Center Differential TORSEN LSD Normal driving
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling

24. VF4B Transfer Center Differential TORSEN LSD Normal driving
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling

25. VF4B Transfer Center Differential TORSEN LSD Normal driving
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling

26. VF4B Transfer Center Differential TORSEN LSD Normal driving Fr Output
Rr Output
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling

27. Confidential VF4B Transfer Center Differential
FORTUNER - Chassis
VF4B Transfer
Confidential
Center Differential
TORSEN LSD (Torque Sensing)
TORSEN LSD automatically adjust the torque distribution ratio for the three modes according to the wheel speed condition to ensure the driving stability
Wheel Speed Condition Under Acceleration
Torque Distribution Ratio
Front
Rear
Front Wheel = Rear Wheel 40 60
Front Wheel > Rear Wheel 29 71
Front Wheel < Rear Wheel 53 47
Confidential !!
For Distributor use only !!!
3-type torque distribution ratio
Number and total surface of clutch make 3 types of ratio
Instructors

28. VF4B Transfer Center Differential TORSEN LSD
FORTUNER - Chassis
VF4B Transfer
Center Differential
TORSEN LSD
Front wheel speed = Rear wheel speed
[Torque Distribution] Front : Rear= 2 : 3
Front: 2/5 x 100=40 Rear: 3/5 x 100=60
Front : Rear= 40 : 60
Front
Rear
This construction makes 40:60 ratio
Instructors

29. VF4B Transfer Center Differential TORSEN LSD
FORTUNER - Chassis
VF4B Transfer
Center Differential
TORSEN LSD
Front wheel speed > Rear wheel speed
Fr Output
Rr Output
Speed difference between front and rear wheel
At front faster condition, pinion starts to rotate
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling
Instructors

30. VF4B Transfer Center Differential TORSEN LSD
FORTUNER - Chassis
VF4B Transfer
Center Differential
TORSEN LSD
Front wheel speed > Rear wheel speed
Friction
Fr Output
Rr Output
-Pinion rotates and applied friction with the carrier
-This braking force and diagonal gear make sliding force
/Ring gear : front side
/Pinion :rear side
/Sungear : rear side
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling
Instructors

31. VF4B Transfer Center Differential TORSEN LSD
FORTUNER - Chassis
VF4B Transfer
Center Differential
TORSEN LSD
Front wheel speed > Rear wheel speed
Fr Output
Rr Output
-Each gear slide applies pressure force to each clutch
-Clutch transfers the rotational speed from faster side to lower speed side as torque transfer
Clutch Plate No. 4
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling
Click!
Clutch Plate No.1
Instructors

32. VF4B Transfer Center Differential TORSEN LSD
FORTUNER - Chassis
VF4B Transfer
Center Differential
TORSEN LSD
Front wheel speed < Rear wheel speed
Fr Output
Rr Output
Speed difference between front and rear wheel
At rear faster condition, pinion starts to rotate
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling
Instructors

33. VF4B Transfer Center Differential TORSEN LSD
FORTUNER - Chassis
VF4B Transfer
Center Differential
TORSEN LSD
Front wheel speed < Rear wheel speed
Friction
Fr Output
Rr Output
-Pinion rotates and applied friction with the carrier
-This braking force and diagonal gear make sliding force
/Ring gear : front side
/Pinion :front side
/Sungear : rear side
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling
Instructors

34. VF4B Transfer Center Differential TORSEN LSD
FORTUNER - Chassis
VF4B Transfer
Center Differential
TORSEN LSD
Front wheel speed < Rear wheel speed
Fr Output
Rr Output
-Each gear slide applies pressure force to each clutch
-Clutch transfers the rotational speed from faster side to lower speed side as torque transfer
Clutch Plate No. 4
Front Output
INPUT
Sun Gear
Coupling
Differential Case
Planetary Carrier
Pinion Gear
Rear Output
Ring Gear
Coupling
Clutch Plate No.1
Click!
Clutch Plate No.2
Instructors

35. [Rear Differential (B200)]
FORTUNER - Chassis
Differential
Overall
S20SNF for front differential, B200 type for rear differential
[Front Differential (S20SNF)]
[Rear Differential (B200)]
Front Differential: S20SNF
Rear Differential: B200, DANA204 / B200 with LSD for Prerunner, 1KD-FTV engine of G.C.C. countries
Engine
Front Dif.
Rear Dif.
Ratio
2TR-FE
S20SNF
B200
4.555
Instructors

36. Suspension Overall Front: Double wishbone type independent suspension
FORTUNER - Chassis
Suspension
Overall
Front: Double wishbone type independent suspension
Rear: Coil spring type rigid axle suspension 4-link coil spring with lateral rod type suspension
Stabilizer is used on front as standard equipment
Instructors

37. Tandem (Lockheed + Lockheed)
FORTUNER - Chassis
Brake
Brake Specifications
Drive Type
2WD, 4WD
Master Cylinder
Type
Tandem (Lockheed + Lockheed)
Diameter [mm (in.)]
20.64 (0.81)
Brake Booster
Gasoline
10” Single
Diesel
9” Single
Front Brake
Caliper Type (Opposed)
S13W for 16-inch
Disc Type
Ventilated
Wheel Cylinder Diameter [mm (in.)]
42.85(1.69) x 2
Rotor Size (D x T) [mm (in.)]
255 x 25 (10.04 x 0.98)
Pad Material
PS558H
Rear Brake
Drum Type
297LT
Drum Inner Diameter [mm (in.)]
295 (11.61)
Lining Material
LN508-FF
Brake Control Valve / Brake Control System
LSP & BV / ABS
Parking Brake Type
Center Lever
Supplier of Brake Actuator
ADVICS
[Skid control ECU with brake actuator]
Supplier: ADVICS
Available model of ABS system is the following models;
STD: Thailand, Malaysia, Philippines, Vietnam, India, G.C.C. Countries (1GR-FE), South Africa (1GR-FE), Latin America (SR grade) and ANCOM
Instructors

38. Load Sensing Proportioning Valve
Brake
Brake Type
Front Disc Brake
Load Sensing Proportioning Valve

39. Brake Fluid Level Warning Switch
Brake Control System
System diagram
Brake Fluid Level Warning Switch
Stop Light Switch
Speed Sensors
Brake Actuator
Deceleration Sensor*1
Skid Control ECU
Speed Sensors
DLC3
Speed Meter
ABS Warning Light
Brake System Warning Light
4WD Detection Switch*1
Combination Meter
*1: Only 4WD model

40. Brake Brake Control System Deceleration Sensor Deceleration Sensor
(Under Driver Seat)

41. FORTUNER - Chassis
Steering
Overall
Rack and pinion, engine speed sensing type power steering is used
ATF Type DEXRON® II or III
Engine Speed Sensing Type Power Steering
Stepless Manual Tilt and Energy Absorbing Mechanism
[HILUX]
Manual Steering: on 2KD-FTV engine for Thailand
Power Steering: Other models
[FORTUNER / HILUX SW4]
Power Steering: for all models as STD
[KIJANG INNOVA / INNOVA]
Manual Steering: for STD grade model for India as STD
Power Steering: Other models as STD
Stepless manual tilt mechanism and steering column energy absorbing mechanism are used on all models as STD
Instructors