1. Chassis Automatic Transaxle 4WD System Suspension System
Air Suspension System
Brake
Tire Pressure Warning System

2. [Major Difference] (from U140E/F)
Chassis -A -W -Q -V
Automatic Transaxle
U151E/F Automatic Transaxle
U151E, U151F are based on U150E (’03 ES300)
Valve body is changed for 5-speed application
Direct / O/D clutch and 2 solenoid valves are added
Multi-mode control is newly adopted
[Major Difference] (from U140E/F)
Basic construction and operation are same as ’03 ES300

3. Differential Gear Ratio
Chassis -A -W -Q -V
Automatic Transaxle
U151E/F Automatic Transaxle
Gear ratio
Model
’04 RX330/300
’03 RX300
’03 ES300
Engine
3MZ-FE
1MZ-FE
Transaxle
U151E
U151F
U140E
U140F
U150E
Gear Ratio
1st
4.235 
3.938
2nd
2.360
2.194
3rd
1.517
1.411
4th
1.047
1.019
0.973
5th
0.756 
0.703
Rev.
3.378
3.141
Counter Gear Ratio
Differential Gear Ratio
3.478
3.080
3.291
Fluid Type
ATF Type T-IV
Oil Capacity
Liters (US qts, lmp.qts)
9.1 (9.5, 7.9)
8.4 (8.9, 7.4)
SNOW mode is used for all modes except -V

4. Chassis Automatic Transaxle Controls-W -Q -V
Automatic Transaxle
Controls
This transaxle uses following controls
Multi-mode Control
Clutch to Clutch Pressure Control
Centrifugal Fluid Pressure Canceling Mechanism
Line Pressure Optimal Control
Clutch Pressure Optimal Control
Flex Lock-up Clutch Control
Shifting Control in Uphill/Downhill Traveling
Flex lock-up control is used only for deceleration to improve fuel economy

5. Chassis Automatic Transaxle Multi-mode Control-W -Q -V
Automatic Transaxle
Multi-mode Control
The shift range position is changed by moving forward and backward the shift lever
This system is newly adopted for all models except –A as STD, -A model as OPT
Multi-mode control is range hold type
Basic construction is same as E-shift (IS300/IS300 SportCross, GS300)

6. Chassis Automatic Transaxle Multi-mode Control-W -Q -V
Automatic Transaxle
Multi-mode Control
“S” mode position and “S” mode indicator light are added S 4 P R N D P R N D S + -
“S” Mode Indicator Light
Shift Range Position Indicator Light
S Mode Position

7. Chassis Automatic Transaxle Multi-mode Control System diagram -A -W -Q-V
Automatic Transaxle
Multi-mode Control
System diagram
Shift Lever
Ignition Timing Advance Control
Engine ECU (ECM)
Shift Up/down Signal S 1 P R N D
Engine CPU
ECT CPU
BEAN
Transaxle Control Signal
Combination Meter

8. Chassis Automatic Transaxle Multi-mode Control-W -Q -V
Automatic Transaxle
Multi-mode Control
Shift range position is invariably in the 4-range, when “S” mode position selects
[Shift Program] S 4 P R N D
Shift Range Position Indicator
Shift Range Position (w/o Multi-mode)
Usable Gear 5 D
5 th st 4
4 th st 3
3 th st 2
2 th st 1
1 st P R N D S + - S 4 D

9. MIL / Check Engine Warning Light
Chassis -A -W -Q -V
Automatic Transaxle
Multi-mode Control
When the engine and ECT ECU detect a malfunction, MIL / check engine warning light illuminates
MIL / Check Engine Warning Light

10. Chassis Automatic Transaxle DTC-W -Q -V
Automatic Transaxle
DTC
Some DTCs is newly added for the 5-speed application
DTC No.
Detection Item
P0711
Transmission fluid temp. sensor malfunction (Fluid temp. sensor)
P0760
Shift solenoid C malfunction (Solenoid valve SL3)
P0763
Shift solenoid C Electrical malfunction (Solenoid valve SL3)
P1815
Solenoid valve SR malfunction
P1818
Solenoid valve SR electrical malfunction

11. Chassis 4WD System Overall-Q -V
4WD System
Overall
LSD of center differential is discontinued and LSD function is operated by brake control system
Speed Sensor M
Engine ECU (ECM)
Throttle Control Motor
Skid Control ECU
Brake Actuator
Center Differential (without LSD Mechanism)

12. Chassis 4WD System LSD Function Difference with A-TRAC (A-TRC) -A -W-Q -V
4WD System
LSD Function
Difference with A-TRAC (A-TRC)
System
Operation
LSD Function
This system applies a brake to the wheel which slipped, and is also controlling the throttle valve opening angle
A-TRAC (A-TRC)
This system only applies a brake to the wheel which slipped

13. Chassis Suspension System Front and Rear Suspension Overall -A -W -Q
MacPherson Strut Type with Multi-leaf Type Shock Absorber
Illustration is 4WD model
Dual Link MacPherson Strut Type with Multi-leaf Type Shock Absorber
Air Suspension equipped for –A, -W models as OPT

14. Chassis Air Suspension System Overall-W
Air Suspension System
Overall
This system has following functions
Automatic Vehicle Height Control
Vehicle Speed Sensing Control
Vehicle Height Switching Control - HI Mode [+30 mm (1.2 in.)] - N Mode - LO Mode [-15 mm (-0.6 in.)] - Access Mode [ -30 mm (-1.2 in)]
[Main Function]
Air suspension system is used for –A and –W models as optional equipment

15. Chassis Air Suspension System System Diagram (Mechanical Parts) -A -W
Vehicle Speed Sensor (RL, RR)
Crankshaft Position Sensor
OFF
Pneumatic Tank
Suspension Control ECU
AIR SUS Relay
Pneumatic Cylinder (FR)
Pneumatic Cylinder (RR)
Dryer
Height Control Cleaner
Pneumatic Cylinder (FL)
Pneumatic Cylinder (RL)
Compressor Unit
: Air Flow Passage : Input Signal : Output Signal

16. Chassis Air Suspension System System Diagram (Electrical Parts) -A -W
Vehicle Speed Sensor (RL, RR)
Crankshaft Position Sensor
Compressor Unit
OFF
Pneumatic Tank
Suspension Control ECU
AIR SUS Relay
Height Control Indicator Light
Height Control Switch
Easy Access Mode Switch
Stop Light Switch
Height Control OFF Switch
Compressor
Front Height Control Sensors
Rear Height Control Sensors
Pneumatic Tank Solenoid Valve
Height Control Compressor Solenoid Valve
Height Control Solenoid Valve Front
Height Control Solenoid Valve Rear
: Air Flow Passage : Input Signal : Output Signal

17. Height Control Indicator Light Height Control OFF Switch
Chassis -A -W
Air Suspension System
Layout of Switches and Indicator
Height Control Indicator Light
Height Control Indicator Light
Height Control Switch
Height Control OFF Indicator Light
Access Model Indicator
Access Mode Switch
Height Control OFF Switch
OFF

18. Chassis Air Suspension System Vehicle Height Switching Control
Three vehicle heights can be selected by operating the height control switch
[Height Control Indicator Light]
+30 mm (1.2 in.)
HI Mode:
N Mode:
LO Mode:
-15 mm (-0.6 in.)

19. Chassis Air Suspension System Vehicle Speed Sensing Control-W
Air Suspension System
Vehicle Speed Sensing Control
Vehicle height is automatically controlled by vehicle speed
HI Mode: +30 (1.2)
HI mode is held for 10 sec. and shifts to N mode after that
Ride Height [mm (in.)]
N Mode: 0
N’ Mode: -7 (-2.8)
LO Mode: -15 (0.6)
Access Mode: -30 (-1.2)
31 (18.8)
50 (31)
80 (50)
100 (62.5)
Vehicle Speed [km/h (MPH)]

20. Access Model Indicator
Chassis -A -W
Air Suspension System
Access Mode Control
Accesses to the vehicle and easy loading and unloading operation
[N Mode]
[Access Mode]
About 30 mm (1.2 in.)
Access Model Indicator

21. Chassis Air Suspension System Access Mode Control Operating condition-W
Air Suspension System
Access Mode Control
Operating condition
1. Access Mode Switch “ON”
2. Ignition Switch Turn to OFF
Access Mode Operation
NOTE: When vehicle height is HI mode, this mode dose not operate
Access Model Switch

22. Service Point Air Suspension System Precautions for Servicing-W
Air Suspension System
Precautions for Servicing
Push the Height control OFF switch, when jacking up the vehicle
OFF
When jacking up, be sure to turn off the height control air suspension. Otherwise, the vehicle height may changed because of the automatic leveling function, resulting in an unexpected accident

23. Service Point Air Suspension System Precautions for Servicing-W
Air Suspension System
Precautions for Servicing
In the removal or reinstallation of height control valve or pneumatic cylinder, when there is little air in the system, be careful of the following case
Action
Caution
Reason
Jacking Down
When jacking down, all the air tubes are reconnected
For diaphragm of pneumatic cylinder protection
Steering
Do not turned the steering wheel, when the tires are grounded
Replenishing of Air
When replenishing of air, Stop the engine approximately 1 minute later. After about 10 minutes have elapsed, restart the engine
For compressor protection
[Compressor Protection Function]
Because this system is provided with a compressor protection function, its maximum continuous operation is set to 100 seconds. If 100 seconds have elapsed while the vehicle height is being raised under height control, the upward movement stops automatically. After approximately 10 minutes have elapsed in the stopped state, the upward movement resumes automatically until the target vehicle height is reached

24. Remove, Install, Adjust and Replace
Service Point -A -W
Air Suspension System
Revise the Offset Value of Vehicle Height
Operate the revision in the following cases
Parts
Revision
Remove, Install, Adjust and Replace
Height Control Sensor
Related Parts of Height Control Sensor
Only the sensors which serviced
Replace
Suspension Control ECU
All Sensors
NOTE: Do not adjust compensation of vehicles height with the adjustment rod of a height control sensor

25. Service Point Air Suspension System-W
Air Suspension System
Revise the Offset Value of Vehicle Height
Revision procedure
1. Start the Engine
2. Start the “HEIGHT OFFSET” mode
3. Operate the following procedure

26. Service Point Air Suspension System-W
Air Suspension System
Revise the Offset Value of Vehicle Height
Revision procedure

27. Front Measure Point = (A-B) Rear Measure Point = (C-D)
Reference -A -W
Air Suspension System
Revise the Offset Value of Vehicle Height
Measure vehicle height
Front
[Measuring Points]
A: Ground clearance of front wheel center
B: Grand clearance of lower suspension arm No. 2 set bolt center
C: Grand clearance of rear wheel center
D: Grand clearance of strut rod set bolt center A B D C
Front Measure Point = (A-B)
Rear Measure Point = (C-D)

28. Service Point Air Suspension System-W
Air Suspension System
Revise the Offset Value of Vehicle Height
Revision procedure
NOTE: One of a millimeter display and the inch displays can be chosen

29. Standard Vehicle Height
Reference -A -W
Air Suspension System
Revise the Offset Value of Vehicle Height
Vehicle height specifications
Items
Standard Vehicle Height
Front
Rear
4WD -A
111.9 mm (4.41 in.)
41.1 mm (1.62 in.) -W
116.9 mm (4.60 in.)
36.1 mm (1.42 in.)
2WD 

30. Service Point Air Suspension System-W
Air Suspension System
Revise the Offset Value of Vehicle Height
Revision procedure
4. Vehicle heights are automatically adjusted by Suspension control ECU
5. It checks whether vehicle height is specified value

31. Chassis Air Suspension System System Failure-W
Air Suspension System
System Failure
If a malfunction occurs in the system
The “N” mode is automatically selected
The height control “OFF” indicator light blinks

32. Service Point Air Suspension System DTC Chart -A -W DTC No.
Detection Item
OFF indicator
5-digit
2-digit
C1711 11
Open or short circuit in right front height control sensor circuit
Blink
C1712 12
Open or short circuit in left front height control sensor circuit 
C1713 13
Open or short circuit in right rear height control sensor circuit
C1714 14
Open or short circuit in left rear height control sensor circuit
C1735 35
Open or short circuit in exhaust solenoid valve circuit
C1737 31
Open or short circuit in right front height control solenoid valve circuit
C1738 32
Open or short circuit in left front height control solenoid valve circuit
C1739 33
Open or short circuit in right rear front height control solenoid valve circuit
C1740 34
Open or short circuit in left rear front height control solenoid valve circuit

33. Service Point Air Suspension System DTC Chart (Continued) -A -W
DTC No.
Detection Item
OFF indicator
5-digit
2-digit
C1741 41
Open or short circuit in AIR SUS relay circuit
Blink
C1742 42
Lock, open of short circuit in height control compressor circuit 
C1744 44
Open or short circuit in pneumatic tank solenoid valve circuit
C1751 51
Continuous electric current to height control compressor circuit
C1761 61
Suspension control ECU malfunction
C1774 74
Power voltage drop
C1776 76
Speed sensor circuit malfunction
C1779 79
Crankshaft position sensor circuit

34. Chassis Brake Front and Rear Brake Overall -A -W -Q -V
ABS with EBD, BRAKE ASSIST, TRAC and VSC as STD
15-inch Solid Disc Brake
17-inch Ventilated Disc Brake

35. Chassis Brake Specifications -A -W -Q -V Engine Type New RX330/300
Previous Model
Master Cylinder
Type
Portless + Portless 
Diameter [mm (in.)]
22.00 (0.87)
25.40 (1.00)
Brake Booster
4WD: 10.5” 2WD: 9.5”
8.5” + 8.5”
Front Brake
17” Ventilated Disc
16” Ventilated Disc
Wheel Cylinder Dia. [mm (in.)]
63.5 (2.50)
60.33 (2.38)
Rotor Size (D x T) [mm (in.)]
319 x 28 (12.56 x 1.10)
296 x 28 (10.83 x 1.10)
Rear Brake
15” Solid Disc
41.28 (1.63)
34.90 (1.38)
288 x 10 (11.34 x 0.39)
269 x 10 (10.60 x 0.39)
Brake Control
STD with EBD, Brake Assist, TRAC and VSC
STD

36. Gear type Actuator Pump
Chassis -A -W -Q -V
Brake
ABS with EBD, BRAKE ASSIST, TRAC and VSC
Actuator pump is changed to trochoid gear type from piston type
Solenoid Portion
Motor
ECU Portion
Gear type Actuator Pump

37. Piston Type (conventional type)
Chassis -A -W -Q -V
Brake
ABS with EBD, BRAKE ASSIST, TRAC and VSC
Trochoid gear type actuator pump is used to reduce operating noise
Torochoid Gear Type
Piston Type (conventional type)
Quantity
Quantity
Time
Time
Small Pulsation  Small Vibration
Large Pulsation  Large Vibration

38. Tire Pressure Monitor ECU
Chassis -A
Tire Pressure Warning System
Overall
This system is controlled by skid control ECU
Brake Actuator
Tire Pressure Monitor ECU
Speed Sensor
Ambient Temp. Sensor
Engine ECU (ECM)
Skid Control ECU
BEAN
Tire Pressure Warning Standardization Switch
Combination Meter
Tire pressure warning system is used for -A models as standard equipment
Tire pressure monitor ECU integrated to Skid control ECU
Tire Pressure Warning Light
Stop Light Switch

39. Tire Pressure Waning Light Tire Pressure Condition
Chassis -A
Tire Pressure Warning System
Tire Pressure Warning Light
Low tire pressure warning
Tire Pressure Waning Light
Tire Pressure Condition
Standard
210 kPa (2.1 kgf/cm2, 30.0 psi)
Warning
Less than 105 – 126 kPa*
( 10.5 – 12.6 kgf/cm2, psi) ON
Warning condition: Tire pressure less than 40-50% for normal tire pressure
*: detection pressure changes with tire size or kinds

40. Chassis Tire Pressure Warning System Tire Pressure Detecting Method
This system uses 2 types of detection method
Tire Pressure Warning Light
Speed Signals
Ambient Temp. Signal
Pressure Reduction Judgment
Presume resonance frequency of tire
Correction
Resonance Frequency of Tire
Relative Wheel Speed
Even if two or more tires are low pressures, this detection method is detectable
Relative Wheel Speed
Tire Pressure
Skid Control ECU

41. Chassis Tire Pressure Warning System Tire Pressure Warning Light
When the malfunction is detected
Priority of warning light
Tire Pressure Warning Light
System Condition 1 ON
Always
Tire pressure warning light circuit malfunction 2
Blinks
System malfunction (Malfunction in skid control ECU, speed sensor etc.) 3
During 3 sec. (after ignition switch ON)
Initial Check 4
Start the initialization mode 5 
Initialization is not completed
(You must initialize the system) 6
Detect pressure reduction
0.5 sec.
1 Hz
1 sec.
Blink
3 times
0.25 sec.
2 Hz

42. Tire Pressure Warning Light
Service Point -A
Tire Pressure Warning System
DTC (Diagnosis Trouble Code)
DTC No.
Detection Item
Tire Pressure Warning Light
C2106 /11
Stop light switch not turn off
Blink (1Hz)
- / 13
Malfunction in brake control system

43. Tire Pressure Warning Standardization Switch
Chassis -A
Tire Pressure Warning System
Initialization
Operate the initialization in the following cases
Tire Pressure Warning Standardization Switch
[Conditions]
After vehicle is shipped (Tire pressure warning indicator blinks by 2Hz)
When a tire or a wheel is replaced
When a tire pressure is adjusted

44. Service Point Tire Pressure Warning System Initialization
Initialization procedure
1. Adjust tire air inflation pressure (all tires)
2. Turn the ignition key to ON
4. The initial adjustment is completed after driving at the speeds of 30 km/h (19 mph) or more about 30 minutes – a hour
3. Push and hold the tire pressure warning standardization switch until the tire pressure warning light blinks for three times
Blinks three times