2005 TOYOTA AVENSIS Service Repair Manual

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Page 17 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual D25088
Same terminal as
a male terminal
D20024
WRONG
CORRECT
D01557
WRONG
Z17004
C
SensorOPEN
1
2B
1
21
21
2A
Fig. 1
ECU
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01±33
AVENSIS REPAIR

Page 18 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual Z17005
Fig. 2
Sensor
C
BA
ECU
1
21
22 1
B04722
Fig. 3
Sensor
B2
A
1
21
2
21
C
B1
1
2ECU
Z17007
Fig. 4
Sensor
CBA
1
21
2
2 15V
5V
0V 01±34
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
AVE

Page 19 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual Z17008
CSHORT
1
2B
1
21
2 A
Fig. 5
Z17009
Fig. 6
Sensor
C
BA
ECU
1
21
22 1
Z17808
Fig. 7
Sensor
B2
A
11 1
C
B1
1ECU
2
222
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01±35
AVENSIS REPAIR

Page 20 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual IN0383
Example
Ground
IN0384
Ground ECU Side
W/H Side
Ground
01±36± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
AVENSIS REPAIR MANUAL (RM1018E)
4. CHECK AND REPLACE ECU
NOTICE:
Start a

Page 21 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual 010B7±13
01±22± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
AVENSIS REPAIR MANUAL (RM1018E)
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
Carry out troubleshooting in accordance with the

Page 22 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual ± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01±23
AVENSIS REPAIR MANUAL (RM1018E)
8 Confirmation test
(a) After completing repairs, confirm that the problem has been solved (If the pro

Page 23 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual Important Points with Customer Problem Analysis
What ±±±±± Vehicle model, system name
When ±±±±± Date, time, occurrence frequency
Where ±±±±± Road conditions
Under what conditio

Page 24 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual ± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01±25
AVENSIS REPAIR MANUAL (RM1018E)
SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
HINT:
The diagnostic system in AVENSIS has various f

± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01±25
AVENSIS REPAIR MANUAL (RM1018E)
SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
HINT:
The diagnostic system in AVENSIS has various functions. The first function is the Diagnostic Trouble
Code (DTC) Check, in which a malfunction in the signal circuits to the ECU is stored in code form in
the ECU memory. Another function is the Input Signal Check, which checks if the signals from various
switches are sent to the ECU correctly. By using these check functions, it is possible to quickly narrow
down potential problem areas and troubleshooting can be performed effectively. The diagnostic func-
tions are incorporated in the following systems in the AVENSIS.
SystemDiagnostic Trouble
Code CheckInput Signal Check
(Sensor Check)Diagnostic Test
Mode (Active Test)
SFI System (1AZ±FE/1AZ±FSE, 1ZZ±FE/3ZZ±FE)
(with Check Mode)
ECD System (1CD±FTV)
(with Check Mode)
ABS with EBD System
ABS with EBD & BA & TRC & VSC System
Electronically Controlled Automatic Transmission [ECT]
(with Check Mode)
Air Conditioning System
Supplemental Restraint System
Audio System
Power Door Lock Control System
Wireless Door Lock Control System
Key Reminder Warning System
Engine Immobiliser System
Theft Deterrent System
Multiplex Communication System
Cruise Control System
In the DTC check, it is very important to determine whether the problem indicated by the DTC is still
occurring or has occurred in the past but returned to normal at present. In addition during the problem
symptom check, it a check must be made on whether the malfunction indicated by the DTC is directly
related to the problem symptom or not. For this reason, the DTC should be checked before and after
symptom confirmation to determine the current conditions. If this is not done, it may, depending on the
case, result in unnecessary troubleshooting for systems that are operating normally. This would make
more difficult to detect the problem area or to try to repair irrelevant areas. Therefore, always follow
the procedures in the correct order and perform the DTC check.
A flow chart showing how to proceed with troubleshooting using the diagnostic trouble code (DTC)
check is shown the this page. This flow chart shows how to utilize the DTC check effectively. Then,
by carefully checking the results, this chart indicates how to proceed either to the DTC troubleshooting
or to the troubleshooting of the problem symptoms table.
1 DTC check
2 Make a note of DTCs displayed and then clear the memory
3 Symptom confirmation

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