Lexus ES300 (1997 year). Service manual — part 7

26

SAFETY AND ENVIRONMENT

A variety of safety and environmental measures are provided based on the theme of ”Gentle to People and the
Environment”.

Safety

Environment

Active Safety

Passive Safety

Attention to the
Environment

Recycling

Adoption of the Super Olefin Polymer
A material identification mark is placed on the
back of resin parts.

HFC134a (R134a) air conditioning refregerant

Impact absorbing structure for side collision.

Excellent body structural components.

Impact absorbing structure in the door trim
and garnish.

Pipe type side protection beam

Crash impact absorbing structure

3–point ELR/ALR seat belt

Front seat belt with pretensioner.

Adoption of driver and front passenger airbag.

Refined MacPherson strut type suspension

Electric modulated suspension

ABS

TRAC (Traction Control) system

World class headlight brightness

High mounted stop lamp.

28

ENGINE — 1MZ-FE ENGINE

ENGINE

1MZ-FE ENGINE

DESCRIPTION

The performance of the 1MZ-FE engine has been improved through the adoption of the 2-way exhaust
control system. In addition, its exhaust emissions have been reduced through the adoption of the fuel
returnless system and the modification of the EGR control system.

ENGINE SPECIFICATIONS AND PERFORMANCE CURVE

Engine 1MZ–FE

Engine

New

Previous

Item

New

Previous

No. of Cyls. & Arrangement

6–Cylinder, V Type

←

Valve Mechanism

24–Valve DOHC,

Belt & Gear Drive

←

Combustion Chamber

Pentroof Type

←

Manifolds

Cross–Flow

←

Fuel System

SFI

←

Displacement

cm

3

(cu. in.)

2995 (182.7)

←

Bore x Stroke

mm (in.)

87.5 x 83.0 x (3.44 x 3.27)

←

Compression Ratio

10.5 : 1

←

Max. Output

[SAE–NET]

149 kW @ 5200

(200HP @ 5200)

140 kW @ 5200

(188HP @ 5200)

Max. Torque

[SAE–NET]

290 N

.

m @ 4400 rpm

(214 ft

.

lbf @ 4400 rpm)

275 N

.

m @ 4400 rpm

(203 ft

.

lbf @ 4400 rpm)

Intake

Open

4

o

BTDC

←

Valve

Intake

Closed

44

o

ABDC

←

Timing

Exhuast

Open

46

o

BBDC

←

g

Exhuast

Closed

2

o

ADTC

←

Fuel Octane Number

RON

91 or Higher

←

Oil Grade

API SH EC–II, ILSAC or Better

←

Premium unleaded gasoline (96 RON) is used for the above specifications.

29

ENGINE — 1MZ-FE ENGINE

Premium unleaded gasoline is used for the above performance curve.

30

ENGINE — 1MZ-FE ENGINE

MAJOR DIFFERENCES

Major differences between the new 1MZ-FE engine and previous engine are listed below.

Item

Outline

Cooling System

An aluminum radiator core is used for weight reduction.
An electric cooling fan has been adopted. The fan speed is

controlled in 3 steps to improve cooling performance and reduce
cooling fan noise.

Intake and Exhaust System

A 2-way exhaust control system has been adopted to improve

engine performance and to ensure an even quieter operation.

Through the optimized allocation of the exhaust pipe supports,

the number of supports has been reduced from 5 to 4, thus
reducing the noise and vibration which are transmitted to the
vehicle body.

Fuel System

A fuel returnless system has been adopted to prevent the internal
temperature of the fuel tank from rising, and to reduce evaporative
emissions.

Engine Mounting

The characteristics of the engine mounts, torque rod, and absorber
have been optimized to reduce noise and vibration.

Engine Control System

A communication circuit has been provided between the ECM and

the ABS & TRAC ECU in conjunction with the adoption of the
TRAC (Traction Control) system.*

The fuel pressure control has been discontinued in conjunction

with the adoption of the fuel returnless system.

Instead of using the IDL signal input from the throttle position

sensor, the ECM now uses the VTA signal to detect the
completely closed state of the throttle valve.

The power steering idle-up control has been changed from the

system using an air control valve to the one using a pressure
switch and an IAC valve.

A new EGR system which uses a EGR valve position sensor is

used.

A communication method of the ECM and the hand-held tester has

been changed from the SAEJ1962 to the ISO9141-2.

*: Applicable only to Vehicles Equipped with the TRAC system.