1. Engine Overall 2UZ-FE Engine-Q -V -C -_ -W
2UZ-FE Engine
V8 (90-degree), 4.7-liter, 32-valve, DOHC gasoline engine w/VVT-i, ETCS-i, ACIS and AI system
[Engine feature]
V type 90-degree, 8 cylinders, 4.7-liter, 32-valve, DOHC gasoline engine
Equipment:
VVT-i (Variable Valve Timing-intelligent)
ETCS-i (Electronic Throttle Control System-intelligent)
ACIS (Acoustic Control Induction System)
AI (Air Injection) System [only for EURO IV model]

2. *: Only for -W models equipped with a pre-cleaner
Engine Overall -Q -V -C -_ -W
Specification
Model
New Model
Previous Model
Engine
2UZ-FE
No. of Cylinders and Arrangement
8-Cylinder, V type 
Valve Mechanism
32-Valve DOHC,
Belt & Gear Drive, VVT-i
Belt & Gear Drive
Combustion Chamber
Pentroof Type
Displacement
cm3 (cu. in.)
4664
(284.5)
Bore x stroke
mm (in.)
94.0 X 84.0
(3.70 X 3.31)
Max. Output
rpm -W
5400
4800
-W*, -C
5400
-Q, -V, Gen
4800
Max. Torque
rpm
3400
3400
3400
*: Only for -W models equipped with a pre-cleaner

3. Engine Overall Specification -Q -V -C -_ -W Model New Model
Previous Model
Engine
2UZ-FE
Compression Ratio
10.0 : 1
9.6 : 1
Firing Order 
Valve Timing
Intake
Open
25 ~ –15 BTDC
3 BTDC
Close
19 ~ 59 ABDC
36 ABDC
Exhaust
46 BBDC
3 ATDC
Emission Regulation -W
EURO IV
EURO III -Q -C
EURO III *1
EURO II *2 -V
EURO III *1 *3
EURO II *2 *3 —
Gen
*1: AT Model *2: MT Model *3: For GCC Countries

4. Engine Overall Major Difference -Q -V -C -_ -W Model New Model
Previous Model
Engine
2UZ-FE
Compression Ratio
10.0 : 1
9.6 : 1
Piston
Piston shape is changed —
VVT-i
For Intake
N.A.
Piston Oil Jet
With
Intake Manifold
Resin
Aluminum
ACIS
Vacuum Actuator Type
Fuel Pump Control
Fuel Pump Controller
Fuel Pump Resister
Sub Fuel Tank
Jet Pump for Fuel Transfer
Fuel Tank Changeover Switch
Air Flow Meter
Slot-in Type
Plug-in Type
Camshaft Position Sensor
MRE Type
Pick-up Coil Type
Knock Sensor
Flat Type
Resonant Type
Accelerator Pedal Position Sensor
Non-contact Type
Contact Type
Air Fuel Ratio Sensor
Planer Type (x2)
Oxygen Sensor
Cup Type (x2)
Cup Type (x4)
AI System
With (for EURO IV Model)
Diagnosis Communication
CAN
Serial
ECM
Dash Panel Penetration Installation
Locates in cabin

5. Intake and Exhaust System-Q -C -W
Exhaust Manifold
Air injection pipe is provided for the air injection system
Air Injection Pipe
Cylinder Head
Air injection system is used only for EURO IV model (-W, -Q and -C).
Exhaust Manifold (RH)
Exhaust Manifold

6. Fuel Tank Solenoid Return Valve
Fuel System -Q -V -C -_
Fuel Tank (Dual Fuel Tank Model Only)
Jet pump is used for the fuel transfer from sub tank to main tank
Fuel Inlet
One-way Valve
Fuel Inlet
Engine
Engine
Fuel Tank Solenoid Return Valve
Sub fuel tank is standard equipment for –Q, -V, –C and Gen.
Fuel Pump
Main Tank
(93-liter)
Sub Tank
(45-liter)
Main Tank
(96-liter)
Sub Tank
(45-liter)
Jet Pump
Fuel Pump
New
Previous

7. Engine Control System Air Injection System-Q -C -W
Air Injection System
Air injection system is used to improve exhaust emission
Air Injection Control Valve (Electric Type)
Air Injection Control Valves (Vacuum Type)
Vacuum
VSVs
Electric Air Pump
Air injection system is used only for EURO IV model (-W, -Q and -C).
This system is used to quicken the warming-up the TWC during the cold start-up for exhaust emission improvement.
[Operation Conditions]
After cold engine start
- THW is 5 to 45 °C (41 to 113 °F)
- THA is 5 °C (41 °F) or more
[Operating Time]
Approx. 60 – 80 seconds
AI system operates until the accumulated intake air volume exceeds the predetermined value.
Note: The ECM estimates the amount of air to the TWC based on the signals from the air flow meter.
TWC

8. Engine Control System Air Injection System System Diagram -Q -C -W
Engine Coolant Temperature Sensor
Mass Air Flow Meter
Intake Air Temperature Sensor
Air Injection
Control Driver
ECM
Air Injection Control Valves (Vacuum Type)
Electric Air Pump
VSVs
Air Injection Control Valve (Electric Type)
Air Pressure Sensor

9. Engine Control System Air Injection System Location -Q -C -W
Air Injection Control Valve (Electric Type)
Air Injection Control Valves (Vacuum Type)
Air Pressure Sensor
Air Injection Control Driver
Inlet
Front
VSVs
Electric Air Pump

10. To Air Injection Control Valve (Electric Type)
Engine Control System -Q -C -W
Air Injection System
Electric air pump supplies air into the air injection control valve
Electric Air Pump
Air Filter
(Maintenance Free)
From Air Inlet
Impeller
To Air Injection Control Valve (Electric Type)
Electric air pump supplies air into the air injection control valve through the impeller.
Electric air pump consists of a DC motor, impeller and air filter.
The air filter is maintenance-free.
DC Motor

11. Air Injection Control Valve (Electric Type)
Engine Control System -Q -C -W
Air Injection System
Air injection control valve (electric type) switches the air to exhaust port ON/OFF
Air Injection Control Valve (Electric Type)
To Air Injection Control Valve (Vacuum Type)
Valve
The air injection control valve (electric type) switches the air to exhaust port ON/OFF and prevents back-flow of exhaust gas.
Opening timing of the valve is synchronized with operation timing of the electric air pump.
Air pressure sensor is used to monitor the air injection system and to detect the malfunction.
From Air Pump
Air Pressure Sensor
Air Pump

12. Air Pressure Condition
Engine Control System -Q -C -W
Air Injection System
ECM monitors the air pressure in the air injection system to detect the malfunction
Air Pressure Condition
System Condition
VSVs, Air Injection Control Valves
Open
Close
Air Pump ON
OFF
Pressure
Time
Pressure
Time
The ECM detects operation condition of the air injection system based on the signals from the air pressure sensor.
When the electric air pump is ON, the pressure increases.
When the VSVs is ON and air injection control valves open, the pressure becomes unstable because of exhaust-pulse.
Pressure
Time
Pressure
Time

13. Air Injection Control Valve (Vacuum Type)
Engine Control System -Q -C -W
Air Injection System
Air injection control valve (vacuum type) switches the air to exhaust port ON/OFF
Air Injection Control Valve (Vacuum Type)
From Air Injection Control Valve (Electric Type)
To Air Injection Pipe (Exhaust Manifold)
ECM controls the VSVs to Open/Close the air injection control valve.
The vacuum is introduced from intake manifold.
Opening timing of the valve is synchronized with operation timing of the electric air pump.
Valve
VSV
For Bank1
For Bank2

14. Engine Control System Air Injection System-Q -C -W
Air Injection System
Air injection control driver actuates electric air pump and air switching valve
ECM
Electric Air Pump Actuation Request
AIRP
SIP
Air Injection
Control Driver
Air Switching Valve Actuation Request
AIRV
SIV
AIDI
Failure Status (Duty) DI
Air injection control driver actuates electric air pump and air switching valve in accordance with the signal from ECM.
Electric Air Pump
Air Injection Control Valve (Electric Type)

15. Duty Ratio (Duty Signal)
Engine Control System -Q -C -W
Air Injection System
Air injection control driver transmits failure status to ECM via duty cycle signal from DI terminal
Conditions
Duty Ratio (Duty Signal)
Normal A B
Failure Status
Open circuit in between AIDI and DI terminal 
Failure in line between ECM and air injection driver terminals
Failure in electric air pump actuation circuit
Failure in air injection control valve circuit
Overheat failure of air injection driver
80%
20% +B
GND +B 0%
GND +B
100%
GND +B 0%
GND
Air injection driver transmits failure status to ECM via duty cycle signal from DI terminal.
20% +B
GND
40% +B
GND
60% +B
GND
A: Electric air pump and air injection control valve are actuating
B: Conditions other than A

16. Engine Control System Air Injection System-Q -C -W
Air Injection System
DTCs for air injection system
DTC
Trouble area
P0412
Secondary Air Injection System Switching Valve "A" Circuit
P0418
Secondary Air Injection System Control "A" Circuit
P1440
Secondary Air Injection Vacuum Switching Valve Circuit Malfunction Bank 1
P1441
Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 1
P1442
Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 1
P1443
Secondary Air Injection Vacuum Switching Valve Circuit Malfunction Bank 2
P1444
Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 2
P1445
Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 2
P1613
Secondary Air Injection Driver Malfunction
P2431
Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1
P2432
Secondary Air Injection System Air Flow / Pressure Sensor Circuit Low Bank1
P2433
Secondary Air Injection System Air Flow / Pressure Sensor Circuit High Bank1
P2440
Secondary Air Injection System Switching Valve Stuck Open Bank1
P2441
Secondary Air Injection System Switching Valve Stuck Close Bank1
P2444
Secondary Air Injection System Pump Stuck On Bank1
P2445
Secondary Air Injection System Pump Stuck Off Bank1
There are 16 DTCs for air injection system.

17. Engine Control System Fuel Pump Control-Q -V -C -_ -W
Fuel Pump Control
Fuel pump ECU controls the fuel pump speed in 3 steps Fr
Fuel Pump ECU
Fuel pump ECU controls the fuel pump speed in 3 steps.
Decrease fuel pump noise and increase fuel pump life by lower voltage fuel pump control.
Reduce evaporative emission by lower fuel pump heating.
Increase fuel economy by PWM control.

18. Fuel Pump Operation Signal
Engine Control System -Q -V -C -_ -W
Fuel Pump Control
Hi:
Mid:
Lo:
OFF: +B 0V
12msec
ECM
Engine Speed
Injection Volume
Fuel Pump Operation Signal
Fuel Pump ECU
FP+
FPC
FPC
Fuel pump ECU controls the fuel pump speed in 3 steps in accordance with the operation signal (duty signal) from ECM (Hi, Mid, Lo or OFF).
- When the engine starts or carries heavy loads with engine speed high, the ECM sends a Hi signal.
- When the engine carries heavy loads with engine speed low, the ECM sends a Mid signal.
- When the engine is idling or carries a light load, the ECM sends a Lo signal.
Fuel pump ECU has a diagnosis function. When a malfunction (open / short circuit, overheat or overcurrent) is detected during the pump operation, fuel pump ECU outputs abnormal signal (0V) from the DI terminal.
Note: The details of the malfunction cannot be known from the diagnosis signal.
While the fuel pump is not operating (FPC input “OFF”), fuel pump ECU outputs 0V from the DI terminal. M
Fuel Pump
Diagnosis Signal DI DI
FP-
Normal: 10V
Abnormal: 0V

19. Engine Control System ECM Dash panel penetration installation -Q -V -C-_ -W
ECM
Dash panel penetration installation
Body
ECM
ECM
Dash panel penetration installation is adopted a countermeasure for heat.
ECM with waterproof connector.
Note: This vehicle uses a fluid coupler driven cooling fan. This system does not control heat in the engine compartment as well as electric cooling fans therefore the ECM is in the cab area for temperature control and the connector is in the engine compartment so that the wire harness does not have to route through the dash panel.
Gasket
(Non-reusable Part)