Lexus SC300 / Lexus SC400. Manual — part 5
INSPECTION AND ADJUSTMENT OF
JOINT ANGLE DURING REMOVAL
AND INSTALLATION OF
PROPELLER SHAFT
When performing operations which involve the removal and instal-
lation of the propeller shaft be sure to check the joint angle. Make
adjustment if necessary (See page
IN–14
–
INTRODUCTION
Inspection and Adjustment of Joint Angle During
Removal and Installation of Propeller Shaft
HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
A large number of ECU controlled systems are used in the LEXUS SC400. In general, the ECU controlled sys-
tem is considered to be a very intricate system requiring a high level of technical knowledge and expert skill to
troubleshoot. However, the fact is that if you proceed to inspect the circuits one by one, troubleshooting of these
systems is not complex. If you have adequate understanding of the system and a basic knowledge of electricity,
accurate diagnosis and necessary repair can be performed to locate and fix the problem. This manual is de-
signed through emphasis of the above standpoint to help service technicians perform accurate and effective
troubleshooting, and is compiled for the following major ECU controlled systems:
Repair Manual
System
Page
1. Engine
V l 1
2. Automatic Transmission
Vol. 1
3. Anti–Lock Brake
4. Traction Control
5. Steering Column Electronic Control
6. SRS Airbag
7. Power Seat Control
V l 2
8. Door Lock Control
Vol. 2
9. Theft Deterrent
10. Wireless Door Lock Control
11. Cruise Control
12. Air Conditioner
The troubleshooting procedure and how to make use of it are described on the following pages.
–
INTRODUCTION
How to Troubleshoot ECU Controlled Systems
IN–15
HOW TO PROCEED WITH TROUBLESHOOTING
Carry out troubleshooting in accordance with the procedure on the following page. Here, only the basic proce-
dure is shown. Details are provided in each section, showing the most effective methods for each circuit. Confirm
the troubleshooting procedures first for the relevant circuit before beginning troubleshooting of that circuit.
Ask the customer about the conditions and the
environment when the problem occurred.
Confirm the symptoms and the problem
conditions, and check the diagnostic codes.
(When the problem symptoms do not appear
during confirmation, use the symptom simu-
lation method described later on.)
Check the result obtained in Step
, then
confirm the inspection procedure for the sys-
tem or the part which should be checked us-
ing the diagnostic code chart or the matrix
chart of problem symptoms.
Check and repair the affected system or part
in accordance with the instructions in Step
.
After completing repairs, confirm that the
problem has been eliminated.
(If the problem is not reproduced, perform the
confirmation test under the same conditions
and in the same environment as when it oc-
curred for the first time.)
IN–16
–
INTRODUCTION
How to Troubleshoot ECU Controlled Systems
[1] CUSTOMER PROBLEM ANALYSIS
In troubleshooting, the problem symptoms must be confirmed accurately and all preconceptions must be
cleared away in order to give an accurate judgment. To ascertain just what the problem symptoms are, it is ex-
tremely important to ask the customer about the problem and the conditions at the time it occurred.
Important Points in the Problem Analysis
The following 5 items are important points in the problem analysis. Past problems which are thought to be unre-
lated and the repair history, etc. may also help in some cases, so as much information as possible should be
gathered and its relationship with the problem symptoms should be correctly ascertained for reference in trou-
bleshooting. A customer problem analysis table is provided in the troubleshooting section for each system for
your use.
Important Points in the Customer Problem Analysis
•
What Vehicle model, system name
•
When Date, time, occurrence frequency
•
Where Road conditions
•
Under what conditions? Running conditions, driving conditions, weather conditions
•
How did it happen? Problem symptoms
(Sample) Engine control system check sheet.
–
INTRODUCTION
How to Troubleshoot ECU Controlled Systems
IN–17
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