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Alphard - Engine Engine Overall Fuel System Engine Control System

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.

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

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 [kW @ rpm] 202 @ 6200 204 @ 6200 203 @ 6200 Maximum Torque [N·m @ rpm] 340 @ 4700 346 @ 4700 342 @ 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

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

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

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

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

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

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

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

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

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)

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. 100 °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. 35 °C (95 °F) or more Fulfill Driving for 90 sec. or more with an engine load equivalent to driving up a 6% slope

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