Lexus SC300 / Lexus SC400. Service manual — part 2

HOW TO USE THIS MANUAL

INDEX

An INDEX is provided on the first page of each sec-
tion to guide you to the item to be repaired.
To assist you in finding your way through the manual,
the Section Title and major heading are given at the
top of every page.

ALPHABETICAL INDEX

An ALPHABETICAL INDEX is also provided at the
end of this manual so that you can rapidly find the
item and page you are searching for.

GENERAL DESCRIPTION

At the beginning of each section, a General Descrip-
tion (Precautions) is given that pertains to all repair
operations contained in that section.

Read these precautions before starting any
repair task.

REPAIR PROCEDURES

Most repair operations begin with an overview il-
lustration. It identifies the components and shows
how the parts fit together.

Example:

PREPARATION

Preparation lists the SST (Special Service Tools), rec-
ommended tools, equipment, lubricant and SSM
(Special Service Materials) which should be prepared
before beginning the operation and explains the pur-
pose of each one.

TROUBLESHOOTING

TROUBLESHOOTING tables are included for each
system to help you diagnose the problem and find the
cause.
The fundamentals of how to proceed with trouble–
shooting are described on page

IN–15

. Be sure to

read this before performing troubleshooting.

IN–2

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INTRODUCTION

How To Use This Manual

The procedures are presented in a step–by–step format:

•

The illustration shows what to do and where to do it.

•

The task heading tells what to do.

•

The detailed text tells how to perform the task and gives
other information such as specifications and warnings.

Example:

This format provides the experienced technician with a FAST
TRACK to the information needed. The upper case task
heading can be read at a glance when necessary, and the
text below it provides detailed information. Important specifi-
cations and warnings always stand out in bold type.

REFERENCES

References have been kept to a minimum. However, when
they are required you are given the page to refer to.

SPECIFICATIONS

Specifications are presented in bold type throughout the text
where needed. You never have to leave the procedure to look
up your specifications. They are also found at the end of each
section, for quick reference.

CAUTIONS, NOTICES, HINTS:

•

CAUTIONS are presented in bold type, and indicate
there is a possibility of injury to you or other people.

•

NOTICES are also presented in bold type, and indicate
the possibility of damage to the component being
repaired.

•

HINTS are separated from the text but do not appear in
bold. They provide additional information to help you
efficiently perform the repair.

SI UNIT

The UNIT given in this manual are primarily expressed with
the SI UNIT (International System of Unit), and alternately ex-
pressed in the metric system and in the yard/pound system.
Example:

Torque: 30 N

⋅

m (310 kgf

⋅

cm, 22 ft

⋅

lbf)

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INTRODUCTION

How to Use This Manual

IN–3

IDENTIFICATION INFORMATION

VEHICLE IDENTIFICATION NUMBER

This number is stamped on the vehicle identification number plate
at the top of the left instrument panel and is also on the certification
regulation label.

A: Vehicle Identification Number
B: Vehicle Identification Number Plate
C: Certification Regulation Label

ENGINE SERIAL NUMBER

The engine serial number is stamped on the engine block as
shown.

GENERAL REPAIR INSTRUCTIONS

1.

Use fender seat and floor covers to keep the vehicle clean
and prevent damage.

2.

During disassembly, keep parts in the appropriate order to
facilitate reassembly.

3.

Observe the following:

(a) CAUTION:

Work must be started after approx. 20 seconds

or longer from the time the ignition switch is turned to the

”LOCK” position and the negative (–) terminal cable is

disconnected from the battery (See page

AB–2

).

(b) Before

performing

electrical

work,

disconnect the

negative cable from the battery terminal.

(c) If it is necessary to disconnect the battery for inspection

or repair, always disconnect the cable from the negative
(–) terminal which is grounded to the vehicle body.

(d) To prevent damage to the battery terminal post, loosen

the terminal nut and raise the cable straight up without
twisting or prying it.

(e) Clean the battery terminal posts and cable terminals

with a shop rag. Do not scrape them with a file or other
abrasive object.

(f)

Install the cable terminal to the battery post with the nut
loose, and tighten the nut after installation. Do not use
a hammer to tap the terminal onto the post.

(g) Be sure the covers for the positive (+) terminal and

negative (–) terminal are properly in place.

4. Check

hose and wiring connectors to make sure that they are

secure and correct.

IN–4

–

INTRODUCTION

Identification Information, General Repair Instructions

5. Non–reusable

parts

(a) Always replace cotter pins, gaskets, O–rings and oil

seals etc. with new ones.

(b) Non–reusable parts are indicated in the component

illustrations by the ”

” symbol.

6. Precoated

parts

Precoated parts are bolts and nuts, etc. that are coated with
a seal lock adhesive at the factory.
(a) If a precoated part is retightened, loosened or caused

to move in any way, it must be recoated with the
specified adhesive.

(b) Recoating of precoated parts

(1) Clean off the old adhesive from the bolt, nut or

threads.

(2) Dry with compressed air.
(3) Apply the specified seal lock adhesive to the bolt or

nut threads.

(c) Precoated parts are indicated in the component

illustrations by the ”

” symbol.

7.

When necessary, use a sealer on gaskets to prevent leaks.

8.

Carefully observe all specifications for bolt tightening
torques. Always use a torque wrench.

9. Use of special service tools (SST) and special service

materials (SSM) may be required, depending on the nature
of the repair. Be sure to use SST and SSM where specified
and follow the proper work procedure. A list of SST and SSM
can be found in the preparation part at the front of each
section in this manual.

10. When replacing fuses, be sure the new fuse has the correct

amperage rating. DO NOT exceed the rating or use one with
a lower rating.

11. Care must be taken when jacking up and supporting the

vehicle. Be sure to lift and support the vehicle at the proper
locations (See page

IN–33

).

(a) If the vehicle is to be jacked up only at the front or rear

end, be sure to block the wheels at the opposite end in
order to ensure safety.

(b) After the vehicle is jacked up, be sure to support it on

stands. It is extremely dangerous to do any work on a
vehicle raised on a jack alone, even for a small job that
can be finished quickly.

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INTRODUCTION

General Repair Instructions

IN–5