Lexus GS300/400 (2000 year). Service manual — part 156
F02415
A
B
C
No. 2 Joint
A – B = – 1
°
01’
±
37’
No. 3 Joint
B – C = + 1
°
14’
±
42’
B07465
New
Previous
–
INTRODUCTION
FOR ALL OF VEHICLES
IN–19
19
6.
INSPECTION AND ADJUSTMENT OF JOINT ANGLE
DURING REMOVAL AND INSTALLATION OF PROPEL-
LER SHAFT
When performing operations which involve the removal and
installation of the propeller shaft, always check the joint angle.
Make adjustments if necessary (See page
7.
FOR VEHICLES EQUIPPED WITH BRAKE PIPE FIT-
TING OF NEW STANDARD
A flare shape of a new standard is used for the brake pipe fitting
from this changed models.
NOTICE:
When ordering or replacing the parts, please be sure
to check and use the fitting of the same flare type.
Do not over–tighten them more than the standard
torque.
Torque: 15 N·m (155 kgf·cm, 11 ft·lbf)
IN04S–10
IN–20
–
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
20
HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
GENERAL INFORMATION
A large number of ECU controlled systems are used in the LEXUS GS400/GS300. In general, the ECU con-
trolled system 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, trouble-
shooting 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 designed through emphasis of the above standpoint to help service technicians
perform accurate and effective troubleshooting, and is compiled for the following major ECU controlled sys-
tems:
The troubleshooting procedure and how to make use of it are described on the following pages.
System
Page
1. Engine
2JZ – GE
2. Engine
1UZ – FE
3. Automatic Transmission
4. ABS & Hydraulic Brake Booster Power Supply System
5. Vehicle Skid Control (VSC) & Brake Assist (BA) System
6. Power Tilt and Power Telescopic Steering Column
7. Supplemental Restraint System
8. Power Seat Control System
9. Cruise Control System
10.Engine Immobiliser System
11.Combination Meter System
12.Sliding Roof System
13.Body No. 1 Control System
14.Body No. 2 Control System
15.Driver Door Control System
16.Passenger Door Control System
17.Rear Left Door Control System
18.Rear Right Door Control System
19.Multiplex Communication System
20.LEXUS Navigation System
21.Air Conditioning System
FOR USING OBDII SCAN TOOL OR LEXUS HAND–HELD TESTER
Before using the scan tool or tester, the scan tool’s instruction book or tester’s operator manual should
be read thoroughly.
If the scan tool or tester cannot communicate with ECU controlled systems when you have connected
the cable of the scan tool or tester to DLC3, turned the ignition switch ON and operated the scan tool,
there is a problem on the vehicle side or tool side.
(1)
If communication is normal when the tool is connected to another vehicle, inspect the diagnosis
data link line (Bus
line) or ECU power circuit of the vehicle.
(2)
If communication is still not possible when the tool is connected to another vehicle, the problem
is probably in the tool itself, so perform the Self Test procedures outline in the Tester Operator’s
Manual.
IN04T–08
Vehicle Brought to Workshop
Customer Problem
Analysis
Symptom Confirmation
and Diagnostic Trouble
Code Check
Symptom Simulation
Diagnostic Trouble
Code Chart
Problem Symptoms Table
Circuit Inspection or Parts
Inspection
Repair
Confirmation Test
End
1
2
4
3
5
6
7
8
Ask the customer about the conditions and the
environment when the problem occurred.
1
Confirm the symptoms and the problem conditions,
and check the diagnostic trouble codes.
(When the problem symptoms do not appear
during confirmation, use the symptom simulation
method described later on.)
2, 3
Check the results obtained in Step 2, then confirm
the inspection procedure for the system or the part
which should be checked using the diagnostic
trouble code chart or the problem symptoms table.
4, 5, 6
Check and repair the affected system or part in
accordance with the instructions in Step 6.
7
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 occurred for
the first time.)
8
–
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
IN–21
21
HOW TO PROCEED WITH TROUBLESHOOTING
Carry out troubleshooting in accordance with the procedure on the following page. Here, only the basic pro-
cedure is shown. Details are provided in Diagnostics section, showing the most effective methods for each
circuit. Confirm the troubleshooting procedures first for the relevant circuit before beginning troubleshooting
of that circuit.
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.
ENGINE CONTROL SYSTEM Check Sheet
Customer’s Name
Driver’s Name
Data Vehicle
Brought in
License No.
Model and Model
Year
Frame No.
Engine Model
Odometer Reading
km
miles
Problem Symptoms
Engine does
not Start
Difficult to
Start
Poor Idling
Poor
Drive ability
Engine Stall
Others
Engine does not crank
No initial combustion
No complete combustion
Engine cranks slowly
Other
Incorrect first idle
Idling rpm is abnormal
High ( rpm)
Low ( rpm)
Rough idling
Other
Hesitation
Back fire
Muffler explosion (after–fire)
Surging
Knocking
Other
Soon after starting
After accelerator pedal depressed
After accelerator pedal released
During A/C operation
Shifting from N to D
Other
Data Problem
Constant
Sometimes ( times per day/month)
Inspector’s
Name
CUSTOMER PROBLEM ANALYSIS CHECK
IN–22
–
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
22
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
extremely important to ask the customer about the problem and the conditions at the time it occurred.
Important Point in the Problem Analysis:
The following 5 items are important points in the problem analysis. Past problems which are thought to be
unrelated 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 troubleshooting. A customer problem analysis table is provided in Diagnostics section for each system
for your use.
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