2006 TOYOTA RAV4 Cover

ENGINE - 2AZ-FE ENGINE EG-4
FEATURES OF 2AZ-FE ENGINE
The 2AZ-FE engine has achieved the following performance through the use of the items listed below.
(1) High performance and reliability
(2) Low noise and vibration
(3) Lightweight and compact design
(4) Good serviceability
(5) Clean emission and fuel economy
Section
Item(1)(2)(3)(4)(5)
Engine
A cylinder block made of aluminum alloy along with a
magnesium alloy die-cast cylinder head cover is used.
Engine
ProperA taper squish shape is used for the combustion chamber.p
A resin gear balance shaft is used.
Vl
A timing chain and chain tensioner are used.
Va l v e
MechanismThe shim-less type valve lifters are used.MechanismThe VVT-i system is used.
A chacoal filter is used in the air cleaner cap.
Intake andIntake manifold made of plastic is used.Intake and
ExhaustThe linkless-type throttle body is used.
SystemA thin-wall ceramic TWC (Three-Way Catalytic converter)
is used.
The fuel returnless system is used.
Fuel
System
Quick connectors are used to connect the fuel hose with the
fuel pipe.
System12-hole type fuel injectors with high atomizing performance
are used.
Ignition
SystemIridium-tipped spark plugs are used.
Charging
SystemThe segment conductor type generator is used.
Starting
SystemPS (Planetary reduction-Segment conductor motor) type
starter is used.
The ETCS-i is used.
Engine
Control
The DIS (Direct Ignition System) makes ignition timing
adjustment unnecessary.
Control
SystemThe non-contact type sensor is used in the throttle position
sensor.
The planar type air-fuel ratio sensor is used.

ENGINE - 2AZ-FE ENGINE
DR011EG20
Cylinder Head Cover
Cylinder Head Cover Gasket
02AEG02Y 02AEG01Y
Cylinder
Bore Side
FrontOuter
Side
Shim A
A
A - A Cross SectionEG-5
ENGINE PROPER
1. Cylinder Head Cover
A lightweight magnesium alloy die-cast
cylinder head cover is used.
Acrylic rubber, which excels in heat resistance
and reliability, is used for the cylinder head
cover gasket.
2. Cylinder Head Gasket
A steel-laminate type cylinder head gasket is used. A shim has been added around the cylinder bore to
increase the sealing surface, thus improving the sealing performance and durability.

ENGINE - 2AZ-FE ENGINE
181EG11
VVT-i ControllerIntake CamshaftTiming Rotor
Exhaust Camshaft
Timing Sprocket
185EG25 181EG14
Cam Spring
Cam
Plunger
SpringChain
Te n s i o n e r
Chain Damper
Oil Jet
Chain TensionerChain SlipperEG-13
2. Camshaft
The intake camshaft is provided with timing rotor to trigger the camshaft position sensor.
In conjunction with the adoption of the VVT-i system, an oil passage is provided in the intake camshaft
in order to supply engine oil pressure to the VVT-i system.
A VVT-i controller has been installed on the front of the intake camshaft to vary the timing of the intake
valves.
3. Timing Chain
A roller chain with an 8 mm (0.315 in.) pitch is used to make the engine more compact.
The timing chain is lubricated by an oil jet.
The chain tensioner uses a spring and oil pressure to maintain proper chain tension at all times.
The chain tensioner suppresses noise generated by the timing chain.
A ratchet type non-return mechanism is used.
To achieve excellent serviceability, the chain tensioner is constructed so that it can be removed and
installed from the outside of the timing chain cover.

ENGINE - 2AZ-FE ENGINE
01MEG30Y
Fuel Pump Assembly
Fuel Filter
Pressure Regulator
Quick Connector
Injector
Fuel Tank
Canister EG-22
FUEL SYSTEM
1. General
The fuel returnless system is used to reduce evaporative emissions.
A fuel cut control is used to stop the fuel pump when the SRS airbag is deployed in a front or side collision.
For details, see page EG-53.
A quick connector is used in the fuel main pipe to improve serviceability.
The 12-hole type fuel injector is used.
The ORVR (On-board Refueling Vapor Recovery) system is used. For details, see page EG-54.

ENGINE - 2AZ-FE ENGINE
Service Tip
The canister pump module performs the EVAP leak check. This check is done approximately five
hours after the engine is turned off. So you may hear sound coming from underneath the luggage
compartment for several minutes. It does not indicate a malfunction.
The pinpoint pressure test procedure is carried out by pressurizing the fresh air line that runs from
the pump module to the air filler neck. For details, refer to the 2006 RAV4 Repair Manual (Pub.
No. RM01M1U).
EG-54
10. EVAP (evaporative Emission) Control System
General
The EVAP (evaporative emission) control system prevents the vapor gas that is created in the fuel tank from
being released directly into the atmosphere.
The canister stores the vapor gas that has been created in the fuel tank.
The ECM controls the purge VSV in accordance with the driving conditions in order to direct the vapor
gas into the engine, where it is burned.
In this system, the ECM checks the evaporative emission leak and outputs DTC (Diagnostic Trouble
Code) in the event of a malfunction. An EVAP (evaporative emission) leak check consists of an
application of a vacuum pressure to the system and monitoring the changes in the system pressure in order
to detect a leakage.
This system consists of the purge VSV, canister, refueling valve, canister pump module, and ECM.
The ORVR (Onboard Refueling Vapor Recovery) function is provided in the refueling valve.
The canister pressure sensor has been included to the canister pump module.
The canister filter has been provided on the fresh air line. This canister filter is maintenance-free.
The followings are the typical conditions for enabling an EVAP leak check:
Typical Enabling
Condition
Five hours have elapsed after the engine has been turned OFF*.
Altitude: Below 2400 m (8000 feet)
Battery voltage: 10.5 V or more
Ignition switch: OFF
Engine coolant temperature: 4.4 to 35C (40 to 95F)
Intake air temperature: 4.4 to 35C (40 to 95F)
*: If engine coolant temperature does not drop below 35C (95F), this time should be extended to 7hours.
Even after that, if the temperature is not less than 35
C (95F), the time should be extended to 9.5 hours.

ENGINE - 2AZ-FE ENGINE
00REG23Y
To Intake Manifold
Atmosphere
Purge VSV
(Open)
ECM
00REG24Y
CloseOpen EG-58
System Operation
1) Purge Flow Control
When the engine has satisfied the predetermined conditions (closed loop, engine coolant temperature
above 74
C (165F), etc.), the stored vapor gas are purged from the canister whenever the purge VSV
is opened by the ECM.
The ECM will change the duty ratio cycle of the purge VSV, thus controlling purge flow volume. Purge
flow volume is determined by intake manifold pressure and the duty ratio cycle of the purge VSV.
Atmospheric pressure is allowed into the canister to ensure that purge flow is constantly maintained
whenever purge vacuum is applied to the canister.
2) ORVR (On-board Refueling Vapor Recovery)
When the internal pressure of the fuel tank increases during refueling, this pressure causes the diaphragm
in the refueling valve to lift up, allowing the vapor gas to enter the canister. Because the vent valve is
always open (even when the engine is stopped) when the system is in a mode other than the monitoring
mode, the air that has been cleaned through the canister is discharged outside the vehicle via the fresh
air line. If the vehicle is refueled in the monitoring mode, the ECM will recognize the refueling by way
of the canister pressure sensor, which detects the sudden pressure increase in the fuel tank, and will open
the vent valve.

ENGINE - 2GR-FE ENGINE
285EG05
Oil Delivery PipeCylinder Head Covers
Cylinder Head
Cover Gaskets
Oil Delivery Pipe
285EG06
Engine
FrontShim A A
For Right Bank
For Left BankA - A Cross SectionEG-73
ENGINE PROPER
1. Cylinder Head Cover
Lightweight yet high-strength aluminum cylinder head covers are used.
An oil delivery pipe is installed inside the cylinder head cover. This ensures lubrication to the sliding parts
of the roller rocker arm, improving reliability.
2. Cylinder Head Gasket
A steel-laminate type cylinder head gasket is used. A shim is used around the cylinder bore of the gasket to
help enhance sealing performance and durability.

ENGINE - 2GR-FE ENGINE
285EG21
Timing Chain Cover
Wa t e r P u m p G a s k e t
Wa t e r P u m pWater Pump Swirl
Chamber
Oil Pump
Housing
Oil Pump RotorsTiming Chain
Cover
Oil Pump Chamber
View from Front Side View from Back Side
285EG22
Oil
Passage
Check Ball
Check Ball
Spring
Plunger SpringPlunger
Roller Rocker ArmCam
Oil
Passage
Hydraulic
Lash Adjuster
Service Tip
Valve clearance adjustment is not necessary because a hydraulic lash adjuster is used in this model.
EG-83
4. Timing Chain Cover
The timing chain cover has an integrated construction consisting of the cooling system (water pump and
water passage) and the lubrication system (oil pump and oil passage). Thus, the number of parts has been
reduced to reduce weight.
5. Hydraulic Lash Adjuster
The hydraulic lash adjuster, which is located at the fulcrum of the roller rocker arm, consists primarily of
a plunger, plunger spring, check ball, and check ball spring.
The engine oil that is supplied by the cylinder head and the built-in spring actuates the hydraulic lash
adjuster. The oil pressure and the spring force that act on the plunger push the roller rocker arm against
the cam, in order to adjust the valve clearance that is created during the opening and closing of the valve.
As a result, engine noise is reduced.