2006 TOYOTA RAV4 turn signal

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
199EG45
ECM
Accelerator Pedal
Position Sensor
Main
Sub
Main
Sub
Throttle
Position
Sensor
Open
Throttle ValveReturn
SpringThrottle
Control
Motor
Accelerator Pedal Throttle Body
199EG46
Accelerator Pedal Throttle BodyECM
Accelerator Pedal
Position Sensor
Main
Sub
Close by
Return Spring
Main
Sub
Throttle
Position
SensorThrottle ValveReturn
SpringThrottle
Control
Motor EG-46
Fail-safe of Accelerator Pedal Position Sensor
The accelerator pedal position sensor is comprised of two (main, sub) sensor circuits. If a malfunction
occurs in either one of the sensor circuits, the ECM detects the abnormal signal voltage difference
between these two sensor circuits and switches to the limp mode. In the limp mode, the remaining circuit
is used to calculate the accelerator pedal depressed angle, in order to operate the vehicle under the limp
mode control.
If both circuits have malfunctions, the ECM detects the abnormal signal voltage from these two sensor
circuits and stops the throttle control. At this time, the vehicle can be driven within its idling range.

ENGINE - 2AZ-FE ENGINE
199EG47
Injectors
ECMIgnition Coils
Accelerator Pedal
Position Sensor
Main
Sub
Main
Sub
Return to
Prescribed Angle
Throttle ValveReturn
SpringThrottle
Control
Motor
Accelerator Pedal Throttle BodyEG-47
Fail-safe of Throttle Position Sensor
The throttle position sensor is comprised of two (main, sub) sensor circuits. If a malfunction occurs in
either one or both of the sensor circuits, the ECM detects the abnormal signal voltage difference between
these two sensor circuits, cuts off the current to the throttle control motor, and switches to the limp mode.
Then, the force of the return spring causes the throttle valve to return and stay at the prescribed opening
angle. At this time, the vehicle can be driven in the limp mode while the engine output is regulated
through the control of the fuel injection (intermittent fuel-cut) and ignition timing in accordance with the
accelerator opening.
The same control as above is effected if the ECM detects a malfunction in the throttle control motor
system.

ENGINE - 2AZ-FE ENGINE
00REG18Y
Front Airbag
Sensor
(RH and LH)
Curtain Shield
Airbag Sensor*
(RH and LH)Airbag
Sensor
Side Airbag
Sensor*
(RH or LH)ECMCircuit
Opening
Relay
Fuel
Pump
Motor
: CANEG-53
9. Fuel Pump Control
A fuel cut control is used to stop the fuel pump when the SRS airbag is deployed at the front collision. In this
system, the airbag deployment signal from the airbag sensor is detected by the ECM, which turns OFF the
circuit opening relay.
After the fuel cut control has been activated, turning the ignition switch from OFF to ON cancels the fuel cut
control, and the engine can be restarted.
*: Models with SRS Driver, Front Passenger, Side and Curtain Shield Airbags

ENGINE - 2AZ-FE ENGINE
00REG25Y
D13N22
Atmosphere
Purge VSV
(OFF)
ECMCanister Pump Module
Ve n t Va l v e
(OFF)
Leak Detection Pump
& Pump Motor
Canister
Pressure Sensor
Purge VSV
Vent Valve
Pump Motor
System PressureON (Open)
OFF (Close)
ON
OFF (Vent)
ON
OFF
Atmospheric Pressure
0.02 in. Leak Pressure
Atmospheric Pressure Measurement
P
M
EG-60
b. Atmospheric Pressure Measurement
1) When the ignition switch is turned OFF, the purge VSV and vent valve are turned OFF. Therefore,
the atmospheric pressure is introduced into the canister.
2) The ECM measures the atmospheric pressure through the signals provided by the canister pressure
sensor.
3) If the measurement value is out of standards, the ECM actuates the leak detection pump in order
to monitor the changes in the pressure.

ENGINE - 2GR-FE ENGINEEG-101
ENGINE CONTROL SYSTEM
1. General
The engine control system of the 2GR-FE engine has the following features.
System
Outline
SFI
(Sequential Multiport
Fuel Injection)
[See page EG-117]
An L-type SFI system detects the intake air mass with a hot-wire type air
flow meter.
ESA
(Electronic Spark
Advance)
Ignition timing is determined by the ECM based on signals from various
sensors. The ECM corrects ignition timing in response to engine
knocking.
This system selects the optimal ignition timing in accordance with the
signals received from the sensors and sends the (IGT) ignition signal to
the igniter.
ETCS-i
(Electronic Throttle
Control
System-intelligent)
[See page EG-118]
Optimally controls the throttle valve opening in accordance with the amount
of accelerator pedal effort and the condition of the engine and the vehicle.
Dual VVT-i
(Variable Valve
Timing-intelligent)
System
[See page EG-120]
Controls the intake and exhaust camshafts to an optimal valve timing in
accordance with the engine condition.
ACIS
(Acoustic Control
Induction System)
[See page EG-126]The intake air passages are switched according to the engine speed and
throttle valve opening angle to provided high performance in all speed
ranges.
Air Intake Control
System
[See page EG-128]The intake air duct is divided into two areas, and the ECM controls the air
intake control valve and the actuator that are provided in one of the areas to
reduce the amount of engine noise.
Fuel Pump Control
[See page EG-53 in
2AZ-FE section]Fuel pump operation is controlled by signals from the ECM.
The fuel pump is stopped, when the SRS airbag is deployed in a frontal,
side, and rear side collision.
Air Conditioning Cut-off
ControlBy turning the air conditioning compressor ON or OFF in accordance with
the engine condition, drivability is maintained.
Charging Control
[See page EG-65 in
2AZ-FE section]The engine ECU regulates the charging voltage of the generator in
accordance with the driving conditions and the charging state of the battery.
Cooling Fan Control
[See page EG-129]
The cooling fan ECU steplessly controls the speed of the fans in accordance
with the engine coolant temperature, vehicle speed, engine speed, and air
conditioning operating conditions. As a result, the cooling performance is
improved.
(Continued)

ENGINE - 2GR-FE ENGINEEG-133
15. Fail-safe
When the ECM detects a malfunction, the ECM stops or controls the engine according to the date already
stored in the memory.
Fail-safe Chart
DTC No.Fail-safe OperationFail-safe Deactivation Conditions
P0031, P0032,
P0051, P0052ECM turns off air-fuel ratio sensor heater.Ignition switch OFF.
P0037, P0038,
P0057, P0058ECM turns off heated oxygen sensor heater.Ignition switch OFF.
P0100, P0102,
P0103Ignition timing is calculated from engine speed
and throttle angle.“Pass” condition detected.
P0110, P0112,
P0113Intake air temperature is fixed at 20C (68F).“Pass” condition detected.
P0115, P0117,
P0118Engine coolant temperature is fixed at 80C
(176
F).“Pass” condition detected.
P0120, P0121,
P0122, P0123,
P0220, P0222,
P0223, P0604,
P0606, P0607,
P0657, P2102,
P2103, P2111,
P2112, P2118,
P2119, P2135
If ETCS-i (Electronic Throttle Control
System-intelligent) has a malfunction, ECM
cuts off current to throttle control motor.
Throttle control valve returns to predetermined
opening angle (approximately 6.5
) by force of
return spring. ECM then adjusts engine output
by controlling fuel injection (intermittent
fuel-cut) and ignition timing in accordance with
accelerator pedal opening angel to enable
vehicle to continue driving at minimal speed. If
accelerator pedal is depressed firmly and
slowly, vehicle can be driven slowly. If
accelerator pedal is depressed quickly, vehicle
may speed up and slow down erratically.If “Pass” condition is detected and
then the ignition switch is turned
OFF, fail-safe operation will stop
and system will return to normal
operating conditions.
P0327, P0328,
P0332, P0333Max. timing retardation.Ignition switch OFF.
P0351, P0352,
P0353, P0354,
P0355, P0356
Fuel is cut.“Pass” condition detected.
P2120, P2121,
P2122, P2123,
P2125, P2127,
P2128, P2138
Accelerator pedal position sensor has two (main
and sub) sensor circuits. If a malfunction occurs
in either of sensor circuits, ECM detects
abnormal signal voltage difference between two
sensor circuits and switches into limp mode. In
limp mode, remaining circuit is used to calculate
accelerator pedal opening to allow vehicle to
continue driving. If both circuits malfunction,
ECM regards opening angle of accelerator pedal
to be fully closed. In this case, throttle valve will
remain closed as if engine is idling.
If “Pass” condition is detected and
then the ignition switch is turned
OFF, fail-safe operation will stop
and system will return to normal
operating conditions.

POWER STEERING – ELECTRONIC POWER STEERING SYSTEMPS–5
PS
SYSTEM DESCRIPTION
1. DESCRIPTION
The EPS (Electronic Power Steering) system generates
torque through the operation of the motor and the
reduction gear installed on the column shaft in order to
assist steering effort.
The power steering ECU determines directions and the
amount of assisting power in accordance with vehicle
speed signals and signals from the torque sensor built
into the steering column assembly. As a result, the power
steering adjusts the steering effort so that it is lighter
during low speed driving and heavier during high speed
driving.
(a) Power steering ECU:
The power steering ECU calculates assisting power
based on steering torque signals from the torque
sensor and vehicle speed signals from the skid
control ECU.
(b) Torque sensor:
The torque sensor detects the steering effort
generated when the steering wheel is turned and
converts it to an electrical signal.
(c) EPS motor:
The EPS motor is activated by the current from the
power steering ECU and generates torque to assist
the steering effort.
(d) Motor rotation angle sensor:
The motor rotation angle sensor consists of the
resolver sensor, which excels in reliability and
durability. The rotation angle sensor detects the
rotation angle of the motor and outputs it to the
power steering ECU. As a result, it ensures efficient
EPS control.