2006 TOYOTA RAV4 ESP

ENGINE - 2AZ-FE ENGINE
01MEG10Y
Charcoal FilterAir Cleaner Cap
Air Cleaner Element
(Nonwoven Fabric)
Service Tip
The charcoal filter, which is maintenance-free, cannot be removed from the air cleaner cap.
01NEG42Y
Throttle Position
Sensor
Throttle Control MotorEG-19
2. Air Cleaner
A nonwoven, full-fabric type air cleaner element is used.
A charcoal filter, which adsorbs the HC that accumulates in the intake system when the engine is stopped,
is used in the air cleaner cap in order to reduce evaporative emissions.
3. Throttle Body
The linkless-type throttle body is used and it realizes excellent throttle control.
A DC motor with excellent response and minimal power consumption is used for the throttle control motor.
The ECM performs the duty ratio control of the direction and the amperage of the current that flows to
the throttle control motor in order to regulate the opening angle of the throttle valve.

ENGINE - 2AZ-FE ENGINE EG-30
ENGINE CONTROL SYSTEM
1. General
The engine control system for the 2AZ-FE engine has the following systems.
System
Outline
SFI
Sequential Multiport
Fuel InjectionAn L-type SFI system directly detects the intake air volume with a hot-wire
type mass air flow meter.
The fuel injection system is a sequential multiport fuel injection system.
ESA
Electronic Spark
AdvanceIgnition timing is determined by the ECM based on signals from various sensors.
The ECM corrects ignition timing in response to engine knocking.
ETCS-i
Electronic
Optimally controls the throttle valve opening in accordance with the amount of
accelerator pedal effort and the condition of the engine and the vehicle.
Electronic
Throttle Control
System-intelligent
(See page-43)A linkless-type is used, without an accelerator cable.
An accelerator pedal position sensor is provided on the accelerator pedal.
A non-contact type throttle position sensor and accelerator pedal position
sensor are used.
VVT-i
Va r i a b l e Va l v e
Timing-intelligent
(See page EG-48)
Controls the intake camshaft to an optimal valve timing in accordance with the
engine condition.
Air-fuel Ratio
Sensor, Oxygen
Sensor Heater
ControlMaintains the temperature of the air-fuel ratio sensor or oxygen sensor at an
appropriate level to realize accuracy of detection of the oxygen concentration in
the exhaust gas.
Air Conditioning
Cut-off ControlBy turning the air conditioning compressor ON or OFF in accordance with the
engine condition, drivability is maintained.
Cooling Fan Control
(See page EG-52)Radiator cooling fan operation is controlled by signals from ECM based on the
engine coolant temperature sensor signal and the condition of the air
conditioning operation.
Fuel Pump Control
(See page EG-53)Fuel pump operation is controlled by signal from the ECM.
The fuel pump is stopped when the SRS driver’s and front passenger’s airbags
are deployed.
Evapotative Emission
The ECM controls the purge flow of evaporative emissions (HC) in the canister
in accordance with engine conditions.
Evapotative Emission
Control
(See page EG-54)Approximately five hours after the ignition switch has been turned OFF, the
ECM operates the canister pump module to detect any evaporative emission
leakage occurring in the EVAP (evaporative emission) control system through
changes in the 0.02 in. leak pressure.
Charging Control
(See page EG-65)The ECM regulates the charging voltage of the generator in accordance with the
driving conditions and the charging state of the battery.
(Continued)

ENGINE - 2AZ-FE ENGINE
00REG17Y
Accelerator Pedal
Position SensorThrottle Valve
Throttle Position SensorThrottle
Control
Motor
Mass Air
Flow MeterECMSkid
Control
ECU
Ignition
CoilFuel
Injector
: CANEG-43
6. ETCS-i (Electronic Throttle Control System-intelligent)
General
The ETCS-i is used, providing excellent throttle control in all the operating ranges. In the 2AZ-FE
engine, the accelerator cable has been discontinued, and an accelerator pedal position sensor has been
provided on the accelerator pedal.
In the conventional throttle body, the throttle valve opening is determined by the amount of the
accelerator pedal effort. In contrast, the ETCS-i uses the ECM to calculate the optimal throttle valve
opening that is appropriate for the respective driving condition and uses a throttle control motor to control
the opening.
The ETCS-i controls the IAC (Idle Air Control) system, the TRAC (Traction Control), VSC (Vehicle
Stability Control) system and curise control system.
In case of an abnormal condition, this system switches to the limp mode.
System Diagram

ENGINE - 2AZ-FE ENGINE
Throttle Body
Throttle Position
Sensor Portion
Reduction
Gears
Throttle ValveMagnetic Yoke
Hall IC
Throttle Control
Motor A
View from A
Cross Section
01NEG44Y
EG-44
Construction
1) Throttle Position Sensor
The throttle position sensor is mounted on the throttle body, to detect the opening angle of the throttle
valve.
2) Throttle Control Motor
A DC motor with excellent response and minimal power consumption is used for the throttle control
motor. The ECM performs the duty ratio control of the direction and the amperage of the current that
flows to the throttle control motor in order to regulate the opening of the throttle valve.
Operation
1) General
The ECM drives the throttle control motor by determining the target throttle valve opening in accordance
with the respective operating condition.
Non-linear Control
Idle Air Control
TRAC Throttle Control
VSC Coordination Control
Cruise Control

ENGINE - 2GR-FE ENGINE
285EG08 285EG07
Intake
Va l v e
Spark
Plug
Hole
Exhaust
Va l v eIntake Side
Exhaust SideCamshaft Housing
Exhaust
SideIntake
Side
Upright
Intake Port
Taper Squish A
A
View from Back Side A - A Cross Section
215EG19 215EG18
Siamese Type Independent Type EG-74
3. Cylinder Head
The cylinder head structure has been simplified by separating the cam journal portion (camshaft housing)
from the cylinder head.
The cylinder head, which is made of aluminum, contains a pentroof-type combustion chamber. The spark
plug is located in the center of the combustion chamber in order to improve the engine’s anti-knocking
performance.
The intake ports are on the inside and the exhaust ports are on the outside of the left and right banks
respectively.
Upright intake ports are used to improve the intake efficiency.
A taper squish combustion chamber is used to improve anti-knocking performance and intake efficiency.
In addition, engine performance and fuel economy have been improved.
The siamese type intake port is used to reduce the overall surface area of the intake port walls. This
prevents the fuel from adhering onto the intake port walls, thus reducing HC exhaust emissions.
— REFERENCE —

ENGINE - 2GR-FE ENGINE
285EG18
Secondary
Timing
ChainExhaust Camshaft Intake CamshaftsExhaust Camshaft
Roller Rocker Arm
Va l v e S p r i n g
Retainer
Va l v e S p r i n g
Hydraulic
Lash Adjuster
Va l v e G u i d e
Bush Va l v e S p r i n g
Sheet
Va l v e
Secondary Timing
Chain Primary
Timing
Chain EG-80
VA LV E M E C H A N I S M
1. General
Each cylinder of this engine has 2 intake valves and 2 exhaust valves. Intake and exhaust efficiency is
increased due to the larger total port areas.
This engine uses roller rocker arms with built-in needle bearings. This reduces the friction that occurs
between the cams and the areas (roller rocker arms) that push the valves down, thus improving fuel
economy.
A hydraulic lash adjuster, which maintains a constant zero valve clearance through the use of oil pressure
and spring force, is used.
The intake camshafts are driven by the crankshaft via the primary timing chain. The exhaust camshafts
are driven by the intake camshaft of the respective bank via the secondary timing chain.
This engine uses a Dual VVT-i (Variable Valve Timing-intelligent) system which controls the intake and
exhaust camshafts to provide optimal valve timing according to driving conditions. With this adoption,
lower fuel consumption, higher engine performance, and fewer exhaust emissions have been achieved.
For details of Dual VVT-i control, see page EG-120.

ENGINE - 2GR-FE ENGINE
01MEG13Y
Air Cleaner Hose with
Resonator
Air Cleaner Cap
Charcoal Filter
Air Cleaner Element
(Nonwoven Fabric)
Air Cleaner Case
Actuator
(For Air Intake Control)
Air Cleaner Inlet
Resonator
285EG32
Throttle Position Sensor
Throttle Control MotorEG-91
2. Air Cleaner
A nonwoven, full-fabric type air cleaner
element is used.
A charcoal filter, which adsorbs the HC that
accumulates in the intake system when the
engine is stopped, is used in the air cleaner case
in order to reduce evaporative emissions. This
filter is maintenance-free.
Along with the use of the air intake control
system, an air intake control valve is provided
on the air cleaner case. For details, see page
EG-128.
Resonators have been provided to reduce the
amount of intake air sound.
3. Throttle Body
A linkless-type throttle body in which the throttle position sensor and the throttle control motor are integrated
is used. It realizes excellent throttle valve control. For details, see page EG-118.
In the throttle control motor, a DC motor with excellent response and minimal power consumption is used.
The ECM performs the duty ratio control of the direction and the amperage of the current that flows to
the throttle control motor in order to regulate the throttle valve angle.

ENGINE - 2GR-FE ENGINE
01MEG34Y
Pulsation Damper
Fuel Filter
Fuel PumpPressure Regulator
Fuel Pump
Assembly
Fuel Tank
285EG38
Fuel Delivery PipesPulsation Damper
Holder
O-ring
Nylon TubeEG-95
2. Fuel Returnless System
This type of fuel system is used to reduce the evaporative emission. As shown below, by integrating the fuel
filter and pressure regulator with fuel pump assembly, the fuel return system in which the fuel returns from
the engine area is discontinued and temperature rise inside the fuel tank is prevented.
3. Fuel Delivery Pipe
The fuel delivery pipe made of plastic is used to realize lightweight.
The right and left fuel delivery pipes are connected by a nylon tube.
The pulsation damper is sealed with an O-ring and secured with a holder.