immo TOYOTA AVENSIS 2002 Repair Manual

010B6±13
±
INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01±21
AVENSIS REPAIR MANUAL (RM1018E)
HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
GENERAL INFORMATION
There are many ECU controlled systems used in the AVENSIS. In general, ECU controlled system are con-
sidered to be very intricate and require a high level of technical knowledge an\
d expert skill to troubleshoot.
The fact is, however, that if you proceed by inspecting the circuits one by one, troubleshoo\
ting of these sys-
tems is not complex. If you have adequate understanding of the system and ba\
sic knowledge of electricity,
the problem can be accurately diagnosed and fixed. This manual is design\
ed based on the above principle
to help service technicians perform accurate and effective troubleshooting, and is compiled for the following
major ECU controlled systems:
The troubleshooting procedures are described on the following pages.
SystemPage
1. SFI System [1ZZ±FE, 3ZZ±FE]05±1
2. SFI System [1AZ±FE]05±143
3. SFI System [1AZ±FSE]05±290
4. ECD System [1CD±FTV]05±523
5. ABS with EBD System05±696
6. ABS with EBD & BA & TRC & VSC System05±752
7. Electronic Controlled Automatic Transmission [ECT] [U241 (1AZ±FE)]05±856
8. Electronic Controlled Automatic Transmission [ECT] [U241 (1AZ±FSE)]05±915
9. Electronic Controlled Automatic Transmission [ECT] [U341]05±980
10.Electronic Motor Power Steering System05±1042
11. Air Conditioning System05±1088
12.Combustion Type Power Heater System05±1161
13.Supplemental Restraint System05±1181
14.Audio System05±1393
15.Navigation System05±1435
16.Combination Meter05±1497
17.Power Door Lock Control System05±1534
18.Wireless Door Lock Control System05±1568
19.Key Reminder Warning System05±1586
20.Engine Immobiliser System05±1599
21.Theft Deterrent System05±1627
22.Multiplex Communication System05±1654
23.Cruise Control System05±1697
FOR USING HAND±HELD TESTER

Before using the tester, the tester's operator manual should be read thoroughly.

If the tester cannot communicate with the ECU controlled systems when you \
have connected the cable
of tester to the DLC3, turned the ignition switch ON and operated the test\
er, there is a problem on the
vehicle side or tester side.
(1) If the communication is normal when the tester is connected to another veh\
icle, inspect the diag-
nosis data link line (Bus
line) or ECU power circuit of the vehicle.
(2) If the communication is still impossible when the tester is connected to a\
nother vehicle, the prob- lem is probably in the tester itself, so perform the Self Test procedures outlined in the Tester Oper-
ator 's 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 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

02±2
± PREPARATIONDIAGNOSTICS
AVENSIS REPAIR MANUAL (RM1018E)
(09083±00150)Test Lead SetAIR CONDITIONING SYSTEM
ABS WITH EBD SYSTEM
ELECTRONIC MOTOR POWER
STEERING SYSTEM
MULTIPLEX COMMUNICATION
SYSTEM
ENGINE IMMOBILISER SYSTEM
ABS WITH EBD & BA & TRC & VSC
SYSTEM
WIRELESS DOOR LOCK CONTROL
SYSTEM
COMBINATION METER
KEY REMINDER WARNING SYSTEM
POWER DOOR LOCK CONTROL
SYSTEM
SFI SYSTEM(1AZ±FE)
SFI SYSTEM(1AZ±FSE)
ECD SYSTEM(1CD±FTV)
SFI SYSTEM(1ZZ±FE/3ZZ±FE)
ELECTRONIC CONTROLLED
AUTOMATIC TRANSAXLE
[ECT](U241E(1AZ±FE))
ELECTRONIC CONTROLLED
AUTOMATIC TRANSAXLE
[ECT](U241E(1AZ±FSE))
ELECTRONIC CONTROLLED
AUTOMATIC TRANSAXLE
[ECT](U341E)
09082±00050TOYOTA Electrical Tester SetPOWER DOOR LOCK CONTROL
SYSTEM
(09083±00150)Test Lead SetAIR CONDITIONING SYSTEM
ABS WITH EBD SYSTEM
ELECTRONIC MOTOR POWER
STEERING SYSTEM
MULTIPLEX COMMUNICATION
SYSTEM
ENGINE IMMOBILISER SYSTEM
ABS WITH EBD & BA & TRC & VSC
SYSTEM
WIRELESS DOOR LOCK CONTROL
SYSTEM
COMBINATION METER
KEY REMINDER WARNING SYSTEM
POWER DOOR LOCK CONTROL
SYSTEM
SFI SYSTEM(1AZ±FE)
SFI SYSTEM(1AZ±FSE)
ECD SYSTEM(1CD±FTV)
SFI SYSTEM(1ZZ±FE/3ZZ±FE)
ELECTRONIC CONTROLLED
AUTOMATIC TRANSAXLE
[ECT](U241E(1AZ±FE))
ELECTRONIC CONTROLLED
AUTOMATIC TRANSAXLE
[ECT](U241E(1AZ±FSE))
ELECTRONIC CONTROLLED
AUTOMATIC TRANSAXLE
[ECT](U341E)

73±34
± THEFT DETERRENT & DOOR LOCKTHEFT DETERRENT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
3. FORCED DOOR LOCK CONTROL
(a) The forced door lock control prevents the vehicle from being tampered with. Immediately after a door
is unlocked (alarm starts), the door is forced to lock by a forced door lock signal.
(1) Conditions that force the doors to lock:
When no key is in the ignition key cylinder and 0.4 seconds have elapsed after the previous out-
put of a forced door lock signal, the doors will be forced to lock if any of the following conditions
is present.

The theft deterrent system is in the armed state of active arming mode.

All the doors are locked.Any door is unlocked.

Any door is unlocked.
HINT:
Only Europe:
Forced door lock control does not operate if any door is unlocked by key.
4. ALARM MEMORY FUNCTION
(a) If the alarm is set off (tampering is detected) while the theft deterrent system is set, the alarm memory
function will record it. Whenever you cancel the theft deterrent system, the alarm memory function
causes the taillights to light up for 2 seconds in order to inform you that the alarm has been set off.
(1) Conditions of the alarm memory function that cause the taillights to light up:
When the theft deterrent system has entered into the alarm sounding state (tampering has been
detected) even once, the taillights will light up for 2 seconds if any of the following conditions is
present.

Switched to the disarmed state from the armed state.
5. SECURITY INDICATOR OUTPUT
(a) The theft warning ECU outputs a signal to light up the security indicator, according to the state of the
theft deterrent system. However, some of the actual lighting conditions of the security indicator are dif-
ferent from the outputs of the theft warning ECU.
Output:
State of Theft Deterrent SystemSecurity IndicatorState of Theft Deterrent SystemOutput Signals from Theft Warning ECUActual Lighting Condition
Disarmed stateOFFOFF (Immobiliser system unset)
BLINKING (Immobiliser system set)
Arming preparation stateONON
Armed stateOFFBLINKING
Alarm sounding stateONON
Blinking cycle:
TimeSecurity Indicator
0.2 sec.ON
1.8 sec.OFF
HINT:
When the immobiliser system is set, the security indicator blinks during the disarmed state and the armed
state, due to the output signals from the immobiliser system.