Engine Control System Diagram Layout of Main Components Main Component of Engine Control System

02KEG37TE
Combination Meter D Vehicle Speed Signal
D Check Engine Warning Light
Neutral Start Switch
Engine Switch Main Body ECU
IG2 Relay
1
Ignition Switch
2
Power Steering Oil Pressure Switch
Electronic Controlled Transmission Solenoid Valve
Starter Cut Relay ECT ECU
Battery Local CAN
Neutral Start Switch
Circuit Opening Relay
Accelerator Pedal Position Sensor
Cooling Fan ECU DLC3
CAN CAN No.1 Bus
Cooling Fan Fuel Pump
Stop Light Switch
Engine ECU
EVAP Valve
Intake Air Temp. Sensor
Throttle Control
Motor VSV
3
For Active Control
Engine Mount Canister
ACIS Actuator VSV For
Air Intake Control
Air Flow Meter
Throttle Position Sensor
Active Control Engine Mount ECU
4 Air
Intake Camshaft Timing Oil Control Valve LH
Injector Injector
Intake VVT Sensor LH
Intake Camshaft Timing Oil Control Valve RH
Intake VVT Sensor RH
Ignition Coil With Igniter
Exhaust VVT Sensor RH Exhaust Camshaft Timing
Oil Control Valve RH Exhaust VVT
Sensor LH Knock
Sensor
TWC
TWC
Exhaust Camshaft Timing Oil Control
Valve LH Air Fuel Ratio Sensor
Bank 1, Sensor 1 Water Temp.
Sensor
Crankshaft Position Sensor
Heated Oxygen Sensor Bank 1, Sensor 2
TWC
Heated Oxygen Sensor Bank 2, Sensor 2
 
 
 
Starter Relay
Air Fuel Ratio Sensor
Bank 2, Sensor 1

3. Engine Control System Diagram

1
: Only for models with smart entry and start system
2
: Only for models without smart entry and start system
3
: Only for models without power tilt and power telescopic steering column
4
: Only for models with power tilt and power telescopic steering column
EG
285EG49
285EG50
Intake VVT Sensor LH
Intake Camshaft Timing Oil Control Valve LH
Ignition Coil with Igniter
Injector Water Temp.
Sensor
Air Fuel Ratio Sensor Bank 2, Sensor 1
Exhaust VVT Sensor LH
Crankshaft Position Sensor
Exhaust Camshaft Timing Oil
Control Valve LH Intake Camshaft Timing
Oil Control Valve RH
Exhaust VVT Sensor RH
Intake VVT Sensor RH
Exhaust Camshaft Timing Oil
Control Valve RH
Air Fuel Ratio Sensor Bank 1, Sensor 1
ACIS Actuator Throttle Position Sensor
Knock Sensor 1
Knock Sensor 2

4. Layout of Main Components

02KEG38Y
VSV for Air Intake Control
Air Cleaner Cap D Vacuum Tank
Engine ECU
Air Flow Meter D Intake Air Temp. Sensor
Fuel Pump
Actuator for Air Intake Control
Heated Oxygen Sensor Bank 1, Sensor 2
Heated Oxygen Sensor Bank 2, Sensor 2
Cooling Fan ECU
VSV
1
Vacuum Type
1
Electric Type
2
Active Control Engine Mount
Check Engine Warning Light
Stop Light Switch
Accelerator Pedal Position Sensor
DLC3 Active Control
Engine Mount ECU
2
LHD Model EG-102
1
: Only for models without power tilt and power telescopic steering column
2
: Only for models with power tilt and power telescopic steering column
EG

5. Main Component of Engine Control System

General
The main components of the 2GR-FE engine control system are as follows:
Components Outline
Quantity Function
Engine ECU 32-bit CPU
1 The engine ECU optimally controls the EFI ESA and
ISC to suit the operating conditions of the engine in accordance with the signals provided by the sensors.
Oxygen Sensor Bank 1, Sensor 2
Bank 2, Sensor 2 Cup Type
with Heater 2
D This sensor detects the oxygen concentration in the exhaust emission by measuring the electromotive
force which is generated in the sensor itself. D The basic construction and operation of this sensor
are the same as in the 1AZ-FE and 2AZ-FE engines. For details,
see page EG-46 .
Air Fuel Ratio Sensor
Bank 1, Sensor 1 Bank 2, Sensor 1
Planar Type with Heater
2 D As with the oxygen sensor, this sensor detects the
oxygen concentration in the exhaust emission. However, it detects the oxygen concentration in the
exhaust emission linearly. D The basic construction and operation of this sensor
are the same as in the 1AZ-FE and 2AZ-FE engines. For details,
see page EG-46 .
Air Flow Meter Hot-wire Type
1 D This sensor has a built-in hot-wire to directly detect
the intake air mass. D The basic construction and operation of this sensor
are the same as in the 1AZ-FE and 2AZ-FE engines. For details,
see page EG-40 .
Crankshaft Position Sensor
Rotor Teeth Pick-up Coil Type
36-2 1
This sensor detects the engine speed and performs the cylinder identification.
Intake VVT Sensor LH, RH
Rotor Teeth MRE Type
3 2
This sensor performs the cylinder identification. Exhaust VVT Sensor
LH, RH Rotor Teeth
MRE Type 3
2 This sensor performs the cylinder identification.
Water Temperature Sensor
Thermistor Type 1
This sensor detects the engine coolant temperature by means of an internal thermistor.
Intake Air Temperature Sensor
Thermistor Type 1
This sensor detects the intake air temperature by means of an internal thermistor.
Knock Sensor 1,2 Built-in
Piezoelectric Type Flat Type
2 This sensor detects an occurrence of the engine
knocking indirectly from the vibration of the cylinder block caused by the occurrence of engine knocking.
Throttle Position Sensor
No-contact Type 1
D This sensor detects the throttle valve opening angle. D The basic construction and operation of this sensor
are the same as in the 1AZ-FE and 2AZ-FE engines. For details,
see page EG-43 .
Accelerator Pedal Position Sensor
No-contact Type 1
D This sensor detects the amount of pedal effort applied to the accelerator pedal.
D The basic construction and operation of this sensor are the same as in the 1AZ-FE and 2AZ-FE engines.
For details, see page EG-42
. Injector
12-Hole Type 6
The injector is an electromagnetically-operated nozzle which injects fuel in accordance with signals from the
engine ECU.
285EG79
Engine Front
Timing Rotor Crankshaft
Position Sensor
279EG50
NE Signal Plate 720 _ CA
10 _ CA
2 Teeth Missing
285EG83 285EG82
Intake VVT Sensor RH
Timing Rotor
Intake VVT Sensor Right Bank
Exhaust VVT Sensor RH
Timing Rotor
Exhaust VVT Sensor Right Bank EG-104
Crankshaft Position Sensor
The timing rotor of the crankshaft consists of 34 teeth, with 2 teeth missing. The crankshaft position sensor outputs the crankshaft rotation signals every 10
_, and the missing teeth are used to determine the top-dead-center.
Intake and Exhaust VVT Sensors 1 General
The MRE Magnetic Resistance Element type intake and exhaust VVT sensors are used. To detect the camshaft position, a timing rotor that is secured to the camshaft in front of the VVT controller is used
to generate 6 3 Hi Output, 3 Lo Output pulses for every 2 revolutions of the crankshaft.
EG
285EG84
VVT Sensor
0 V
Crankshaft Position
Sensor 0 V
VVT Sensor Signal Plate 720 _ CA
180 _ CA
60 _ CA
60 _ CA
180 _ CA
120 _ CA
120 _ CA
360 _ CA
360 _ CA
10 _ CA
Sensor Output Waveforms
A
2 MRE Type VVT Sensor
D The MRE type VVT sensor consists of an MRE, a magnet and a sensor. The direction of the magnetic field changes due to the different shapes protruded and non-protruded portions of the timing rotor,
which passes by the sensor. As a result, the resistance of the MRE changes, and the output voltage to the engine ECU changes to Hi or Lo. The engine ECU detects the camshaft position based on this
output voltage.
D The differences between the MRE type VVT sensor and the pickup coil type VVT sensor used on the conventional model are as follows.
Item Sensor Type
Item MRE
Pick-up Coil Signal Output
Constant digital output starts from low engine speeds.
Analog output changes with the engine speed.
Camshaft Position Detection
Detection is made by comparing the NE signals with the Hi Lo output
switch timing due to the protruded non-protruded portions
of the timing rotor, or made based on the number of the input NE signals
during Hi Lo outputs. Detection is made by comparing the
NE signals with the change of waveform that is output when the
protruded portion of the timing rotor passes.
271EG160
Timing Rotor
Intake VVT Sensor RH
VCV1 VV1+
VV1– Engine ECU
Intake VVT Sensor RH
232CH41
Engine Speed
Sensor Output
MRE Type
Digital Output Engine
Speed
Sensor Output
No Detecting
Analog Output
Pick-up Coil Type EG-106
Wiring Diagram
A
MRE Type and Pick-up Coil Type Output Waveform Image Comparison
A
EG
Service Tip
These knock sensors are mounted in the specific directions and angles as illustrated. To prevent the right and left bank connectors from being interchanged, make sure to install each sensor in its
prescribed direction.
285EG55
Knock Sensor RH
Engine Front
Knock Sensor LH
Knock Sensor Flat Type
D In the conventional type knock sensor resonant type, a vibration plate which has the same resonance point as the knocking frequency of the engine is built in and can detect the vibration in this frequency
band. On the other hand, a flat type knock sensor non-resonant type has the ability to detect vibration in a wider frequency band from about 6 kHz to 15 kHz.
D The basic construction and operation of this sensor are the same as in the 1AZ-FE and 2AZ-FE engines. For details,
see page EG-44 .
01YEG11Y
Accelerator Pedal Position Sensor
Throttle Valve Throttle Position Sensor
Throttle Control Motor
Air Flow Meter Cruise Control
Switch
1
Skid Control ECU
CAN Gateway ECU
2 CAN
CAN No.2 Bus CAN
CAN No.1 Bus
Distance Control ECU
2
Millimeter Wave Radar Sensor
2
Engine ECU Ignition Coil
Fuel Injector

6. ETCS-i Electronic Throttle Control System-intelligent