Lexus ES300 (2002 year). Manual — part 128

ENGINE – 1MZ-FE ENGINE

EG-17

Specifications

Capacity

liters (US qts, Imp. qts)

9.2 (9.7, 8.1)

Engine Coolant

Type

TOYOTA Long Life Coolant

g

Type

TOYOTA Long Life Coolant

or Equivalent

Thermostat

Opening Temperature

C (F)

80 – 84 (176 – 183)

ENGINE – 1MZ-FE ENGINE

EG-18

211EG08

Exhaust Manifold

Intake Manifold

Intake Air Chamber

Throttle Body

Main Muffler

Sub Muffler

TWCs

INTAKE AND EXHAUST SYSTEM

1. General

The adoption of the ETCS-i (Electronic Throttle Control System-intelligent) has realized excellent throttle

control.

The adoption of the ACIS (Acoustic Control Induction System) has improved the engine performance.
The adoption of the air intake control system has improved engine noise reduction and performance. For

details, see page EG-46.

2-way exhaust control system is provided to reduce noise and back pressure in the main muffler.

ENGINE – 1MZ-FE ENGINE

EG-19

211EG34

Throttle
Position
Sensor

Throttle Control Motor

211EG19

Intake Air Control Valves

Actuators
(for ACIS)

2. Throttle Body

The link-less type ETCS-i has adopted and it

realizes excellent throttle control.
For details of ETCS-i control, refer to see page
EG-39.

A DC motor with excellent response and mini-

mal power consumption is used for the throttle
control motor. The ECM performs the duty ra-
tio control of the direction and the amperage of
the current that flows to the throttle control mo-
tor in order to regulate the opening angle of the
throttle valve.

3. Intake Air Chamber

The intake air chamber is made of plastics to realize lightweight.
The intake air chamber consists of upper and lower sections and contains an intake air control valve. This
valve is activated by ACIS (Acoustic Control Induction System) and is used to alter the intake pipe length
to improve the engine performance in all speed ranges. For details of ACIS control, refer to see page EG-42.

ENGINE – 1MZ-FE ENGINE

EG-20

211EG35

A – A Cross Section

B – B Cross Section

A

A

B

B

Engine Coolant
Passage

Engine
Coolant
Passage

Rubber Coating

Intake
Port Side

Outer
Side

208EG113

Air Fuel Ratio
Sensor
(Bank 1, Sensor 1)

TWCs

Air Fuel Ratio Sensor
(Bank 2, Sensor 1)

for Right Bank

for Left Bank

211EG09

4. Intake Manifold

The port diameter of the intake manifold and the port length have been optimized.
An engine coolant passage connects the left and right banks at the rear end of the intake manifold.
The intake manifold gaskets has rubber coating applied onto surface, and provide superior durability.

5. Exhaust Manifold

A stainless steel exhaust manifold is used for improving the warm-up of three-way catalytic converter and

for weight reduction.

The air fuel ratio sensor has been adopted to the exhaust manifold.
An ultra thin-wall, high-cell metal type TWC (Three-Way Catalytic Converter) has been adopted. This

TWC enables to improve exhaust emissions by optimizing the cells density.