Lexus RX300 (MCU15). Service manual — part 43
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ENGINE — 1MZ-FE ENGINE
45
3. Engine Control System Diagram
Pressure
Regulator
Fuel Pump
EFI
Main
Relay
Battery
Circuit
Opening
Relay
DLC3
Combination
Meter
Air
Conditioner
ECU
Heated Oxygen Sensor
(Bank 1, Sensor 2)
Knock
Sensor
Ignition
Switch
MIL
Engine ECU
Solenoid Valves
Pulsation
Damper
TWC
Ignition Coil
with Igniter
Throttle Position Sensor
Camshaft Timing
Oil Control Valve
Air Flow
Meter
Intake Air
Temp. Sensor
Stop Light Switch
Neutral Start Switch
Water Temp.
Sensor
VSV (for EVAP)
ISC Valve
Air Fuel Ratio Sensor
(Bank 1, Sensor 1)
Electric Load Switch
Injector
Air Fuel Ratio Sensor Heater Relay
Actuator
VSV (for ACIS)
VVT Sensor
VVT Sensor
Camshaft Timing
Oil Control Valve
TWC
TWC
Air Fuel Ratio Sensor
(Bank 2, Sensor 1)
Knock
Sensor
Crankshaft
Position Sensor
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ENGINE — 1MZ-FE ENGINE
46
4. Layout of Components
Injector
Crankshaft
Position Sensor
Camshaft Timing
Oil Control Valve
VVT Sensor
(Bank 2)
Ignition Coil
with Igniter
Water Temp. Sensor
VSV (for ACIS)
Engine ECU
VSV (for EVAP)
Camshaft Timing
Oil Control Valve
Heater
Oxygen
Sensor
(Bank 1,
Sensor 2)
Air Fuel Ratio Sensor
(Bank 2, Sensor 1)
Air Fuel Ratio Sensor
(Bank 1, Sensor 1)
Knock Sensor
ISC Valve
VVT Sensor
(Bank 1)
Throttle Position Sensor
DLC3
187EG34
EG
ENGINE — 1MZ-FE ENGINE
Intake Camshaft
VVT-i Controller
VVT Sensor
Timing
Rotor
161ES42
47
5. Main Components of Engine Control System
General
The main components of the 1MZ-FE engine control system are as follows:
Component
Outline
Quantity
Air Flow Meter
Hot-Wire Type
1
Crankshaft Position Sensor (Rotor Teeth)
Pick-Up Coil Type (36 – 2)
1
VVT Sensor (Rotor Teeth)
Pick-Up Coil Type 3
1
Throttle Position Sensor
Linear Type
1
Knock Sensor
Built-In Piezoelectric Type
2
Air Fuel Ratio Sensor
(Bank 1, Sensor 1)
(Bank 2, Sensor 2)
Type with heater
2
Oxygen Sensor
(Bank 1, Sensor 2)
Type with heater
1
Injector
4-Hole Type with Air Assist
6
ISC Valve
Rotary Solenoid Type
1
VVT Sensor
A VVT sensor is mounted on the intake side of each
cylinder head. To detect the camshaft position, a
timing rotor that is provided ont the VVT-i control-
ler is used to generate 3 pulses for every 2 revolu-
tions of the crankshaft.
ENGINE — 1MZ-FE ENGINE
157EG22
157EG23
Throttle Position Sensor
Camshaft Timing Oil Control Valve
VVT Sensor
Engine ECU
Water Temp. Sensor
Air
Flow Meter
Crankshaft Position Sensor
Crankshaft Position Sensor
Air Flow Meter
Throttle Position Sensor
Water Temp. Sensor
VVT Sensor
Target Valve Timing
Camshaft Timing Oil
Control Valve
Correction
Actual Valve Timing
Engine ECU
Feedback
Duty Control
VVT Sensor
Camshaft Timing Oil Control Valve
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6. VVT-i (Variable Valve Timing-intelligent) System
General
The VVT-i system is designed to control the intake camshaft within a wide range of 60
° (of crankshaft
angle) to provide a valve timing that is optimally suited to the engine condition, thus realizing improved
torque in all the speed ranges and fuel economy, and reduce exhaust emissions.
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