1. Alphard - Engine
Contents
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2. Alphard - Engine
Engine Overall
Fuel System
Engine Control System

3. Basic construction and operation is same as 2GR-FE on PREVIA and CAMRY
Alphard - Engine
Engine Overall
2GR-FE Engine
V6 (60-degree), 3.5-liter, 24-valve, DOHC engine w/Dual VVT-i, ACIS and ETCS-i
Basic construction and operation is same as 2GR-FE on PREVIA and CAMRY
[Engine feature]
V type 60-degree, 6 cylinders, 3.5-liter, 24-valve, DOHC gasoline engine
NOTE: Basic construction and operation is same as 2GR-FE on PREVIA and CAMRY.

4. Engine Overall Features Rotary Solenoid Type ACIS Valve
Alphard - Engine
Engine Overall
Features
Rotary Solenoid Type ACIS Valve
MRE Type VVT Sensor
Long-reach Type Spark Plug
3 Timing Chains
Dual VVT-i
Camshaft Housing
Hydraulic Lash Adjuster
[Feature of engine proper]
- Camshaft housing
- Valve mechanism with 3 timing chains
- Hydraulic lash adjuster
- Element replacing type oil filter
- Rotary solenoid type ACIS valve
- Long reach type spark plug
- Dual VVT-i (VVT-i for intake and exhaust camshafts)
- MRE type VVT sensor
Element Replacing Type Oil Filter
Stepless Controlled Double Electric Cooling Fan

5. Engine Overall Specification
Alphard - Engine
Engine Overall
Specification
Model
ALPHARD
PREVIA
CAMRY
RX350
Engine
2GR-FE 
No. of Cylinders and Arrangement
6-Cylinder,
V-type
Valve Mechanism
24-Valve DOHC,
Chain Drive,
Dual VVT-i
Displacement
[cm3 (cu. in.)]
3456
(210.9)
Bore x Stroke
[mm (in.)]
94.0 x 83.0
(3.70 x 3.27)
Compression Ratio
10.8
Maximum Output
rpm]
6200
6200
6200
Maximum Torque
rpm]
4700
4700
4700
Emission Regulation
EURO IV *1 EURO III *2,3 EURO II *4
EURO IV
EURO IV *1 EURO III *2 EURO II *4
*1: Hong Kong *2: Thailand *3: Malaysia *4: Indonesia

6. Engine Overall Major Difference Model ALPHARD PREVIA CAMRY RX350
Alphard - Engine
Engine Overall
Major Difference
Model
ALPHARD
PREVIA
CAMRY
RX350
Engine
2GR-FE 
Radiator Reservoir Tank
Pressurized type
Open air type
Air Intake Control System
N.A.
With
2-Way Exhaust Control System
Fuel Pump Control
2-step control
(With fuel
pump resistor)
1-step control
(Without fuel
(With fuel pump resistor)
Charcoal Canister
Integrated to the fuel pump
Not integrated
Fuel Tank
Steel made
Plastic made
Charging Control
Engine Mount (Front)
Hydraulic type
ACM (VSV type)
Cooling Fan
2 controllers
1 controller
Cooling fan operation after engine stopped
ECM
TCM is separated (U660E)
TCM is integrated
(U151F)
ACM: Active Control engine Mount

7. Fuel System Fuel Pump Module
Alphard - Engine
Fuel System
Fuel Pump Module
Charcoal canister is integrated in fuel pump module to reduce number of parts A B C
Charcoal Canister
Fuel Tank
Fuel Pump
A: To Purge VSV
Same as PREVIA
C: To Fuel Tank
B: To Atmosphere
Fuel Pump Module

8. Engine Control System Charging Control
Alphard - Engine
Engine Control System
Charging Control
ECM controls the alternator generation voltage to reduce engine load for fuel economy
Reduce engine load
Acceleration
Deceleration

9. Engine Control System Charging Control
Alphard - Engine
Engine Control System
Charging Control
Battery current sensor and battery temp. sensor is used for this system
Alternator
Generated Voltage is variable
Electric Load
(Wiper, Blower etc.)
IC Regulator
Generation Voltage
ECM
Battery Current Sensor
(With Battery Temp. Sensor)
Current
Calculate Battery Condition
Temperature
Throttle Position Sensor
Battery temp sensor is integrated in the battery current sensor.
Battery Temp. Sensor: Thermistor Type
Battery Current Sensor: Hall IC Type
Voltage
Crankshaft Position Sensor + -
Battery
Driving Condition Judgment
Vehicle Speed Sensor
Neutral Start Switch

10. Engine Control System Charging Control
Alphard - Engine
Engine Control System
Charging Control
Battery current sensor uses Hall IC
Battery temperature sensor is integrated
Battery Temperature Sensor (Thermistor)
Magnetic Flux
Current +
Hall IC
Core -
The battery current sensor uses Hall IC.
The battery temperature sensor is integrated into the battery current sensor.
This sensor detects the battery surrounding temperature.
4.5
Output Voltage (V)
2.5
0.5
-100
+100
Current (A)
Battery Minus Terminal

11. Engine Control System Charging Control System Diagram + - ECM
Alphard - Engine
Engine Control System
Charging Control
System Diagram
Voltage, Current, Battery Temp.
Throttle Position,
Engine Speed,
Vehicle Speed, Shift Position
ECM
Alternator Assembly +B IG
CPU + -
Battery
Communicates with ECM to get the vehicle and battery conditions. E F L
Combination Meter
IC Regulator

12. Without Charging Control
Alphard - Engine
Engine Control System
Charging Control
Operation (Example)
Fast
Vehicle Speed
Vehicle Speed
Slow
Idling
Acceleration
Constant Driving
Deceleration
Driving Condition
Regulate
SOC LO HI
Generation Mode
Target SOC
Control Region
SOC*
W/O charging control: Generated voltage is controlled depending on the electric load / Battery condition.
With charging control: (ECM controls)
- Vehicle Acceleration: Decrease the generated voltage by the alternator.
- Vehicle Deceleration: Increases the generated voltage.
- During idling and constant-speed driving: Regulates the generated voltage in accordance with the battery input and output current values.
Without Charging Control Hi
Generated Voltage Lo
*: State Of Charge

13. V Engine Control System Charging Control
Alphard - Engine
Engine Control System
Charging Control
Fail-safe: ECM stops charging control if one of the following conditions is met
1. Voltage drops
3. High electric load V 12
2. Battery fluid temp. abnormal
In fail-safe mode, generated voltage is controlled as conventional control.
4. Malfunction
ECM
Various Sensors

14. Cooling Fan Motors (Stepless Control)
Alphard - Engine
Engine Control System
Cooling Fan Control
Cooling fan ECU actuates cooling fan motors by duty signal (stepless control)
Water Temp. Signal
Vehicle Speed Signal
Engine Speed Signal
A/C Switch Condition
Fan Speed Signal
ECM
Cooling Fan ECU
A cooling fan ECU is used to control the high wattage 2 cooling fans.
Cooling fan motors are controlled by duty signal (Stepless Control).
Cooling Fan Motors (Stepless Control)

15. Engine Control System Cooling Fan Control
Alphard - Engine
Engine Control System
Cooling Fan Control
By the following conditions, the cooling fan is driven for maximum 8 minutes after engine stopped
IG-OFF
Engine running
Engine stopped
Before IG-OFF for 3 minutes
After IG-OFF for maximum 8 minutes
Cooling fan is continuously driven
Engine coolant temp °C (212 °F) or more
When all of the following conditions are fulfilled for 3 minutes just before the engine is stopped, the cooling fan continues to operate for maximum 8 minutes.
- When the engine coolant temperature is 100 °C (212 °F) or more.
- When the outside air temperature is 35 °C (95 °F) or more.
- When driving for more than 90 sec. with an engine load equivalent to driving up a 6% slope. *
*: This decision is based on air flow meter, throttle opening and vehicle speed sensors.
Outside air temp °C (95 °F) or more
Fulfill
Driving for 90 sec. or more with an engine load equivalent to driving up a 6% slope

16. Engine Control System Cooling Fan Control
Alphard - Engine
Engine Control System
Cooling Fan Control
The operation of cooling fan can be canceled
While the cooling fan is driving
IG OFF
IG-ON
IG OFF
When the engine switch is turned from OFF to IG-ON while the cooling fan is driving, the cooling fan stops.
Then, the cooling fan is not driven even if the engine switch is turned to OFF again.
Cooling fan is driven (Max. 8 minutes)
Cooling fan stops
Cooling fan is not driven