TOYOTA AVALON 2001 Service Repair Manual

DI1AS-20
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-605
761 Author
: Date
:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC B2795/99 Unmatched Key Code
This DTC is output when an unregistered key is inserted. When this DTC is output, delete DTC and insert
the key that a customer keeps to check that B2795 is output.
When a key that outputs B2795 is found, register this key. when B2795 is not output, there is a possibility
that the unregistered key has been inserted before. (ECM is normal.)
Inquire a customer the condition of using the system to find the cause of the trouble.
(Example: Another key has been inserted, etc..)
DTC No.DTC Detecting ConditionTrouble Area
B2795/99No communication
Key
INSPECTION PROCEDURE
1 Delete DTC and insert all the presently available keys to check whether the en-
gine starts or not.
HINT:
When inserting the key that does not start the engine, DTC (B 2795) is stored in memory.
RESULT:
OKAll keys starts the engine.
NGA specific key does not start the engine.
OK No problem.
HINT:
If the result is ºOKº, please confirm whether or not customers
have ever inserted the unregistered key or the immobiliser key
(with transponder chip) of other vehicle in the ignition key cylin-
der, and find out the cause of detecting DTC.
NG
Register the key that does not start the en-
gine.

I11736
Transponder Key
Amplifier
18
E7
E719
28
E7
CODERXCK TXCT
CODE RXCKTXCT
L-Y
L-O
P-G 4
3
2ECM
T6 DI-606
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
762 Author
: Date
:
2001 AVALON (RM808U)
DTC B2796/99 No Communication in Immobiliser system
CIRCUIT DESCRIPTION
This code is stored in memory when inserting the key that does not have a transponder chip or if communica-
tion between the key and ECM is impossible.
DTC No.DTC Detecting ConditionTrouble Area
B2796/99No communication

Key

Transponder Key Coil

Transponder Key Amplifier

Wire harness

ECM
WIRING DIAGRAM
DI1AT-23

- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-607
763 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Delete DTC and insert all the presently available keys to check whether the en-
gine starts or not.
RESULT:
AAll keys start the engine.
BA specific key does not start the engine. In this case, DTC
(B 2796) is stored in memory.
CAll keys do not start the engine. In this case, DTC (B 2796)
is stored in memory.
A No problem at this time.
HINT:
If the result is ºAº, please confirm whether or not customers
have ever inserted the key (without transponder chip) of other
vehicle in the ignition key cylinder, and find out the cause of de-
tecting DTC.
B The transponder chip of a specific key is defec-
tive. Replace the key.
C
2 Check transponder key coil (See page BE-181).
NG Replace transponder key coil.
OK
3 Check harness and connector between transponder key amplifier and ECM.
NG Repair or replace harness and connector.
OK

DI-608
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
764 Author
: Date
:
2001 AVALON (RM808U)
4 Does it operate normally after replacement of transponder key amplifier?
Yes Replace transponder key amplifier.
No
Replace ECM.

I11736
Transponder Key
Amplifier
18
E7
E719
28
E7CODERXCK TXCT
CODE RXCKTXCT
L-Y
L-O
P-G 4
3
2ECM
T6
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-609
765 Author
: Date
:
2001 AVALON (RM808U)
DTC B2797/99 Communication Malfunction No.1
CIRCUIT DESCRIPTION
This code is detected when although the communication has been performed normally, an error occurs.
(Example. Some noise is included in communication line.)
DTC No.DTC Detecting ConditionTrouble Area
B2797/99Communication error

Wire Harness

Transponder Key Amplifier

ECM
WIRING DIAGRAM
DI6LC-01

I02681
Noise
DI-610
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
766 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Noise check
PREPARATION:
Insert the already registered master key in the key cylinder.
CHECK:
Using an oscilloscope or hand-held tester, check that noise is
included in the signals sent to the CODE terminal of Engine and
ECT ECU.
OK:
No noise is detected.
NG Try to find the cause of the noise and remove it.
OK
2 Does the system operate normally after replacement of transponder key amplifi-
er?
Yes Replace transponder key amplifier.
No
Replace ECM.

I13607
Transponder
Key Amplifier
Transponder
Key Coil
1 2
ANT1 ANT2
T6
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-613
769 Author
: Date
:
2001 AVALON (RM808U)
Transponder key coil circuit
CIRCUIT DESCRIPTION
DTC No.Detection ItemTrouble Area
B2798/99Communication error

Key

Transponder Key Coil

Transponder Key Amplifier

Wire harness

ECM
WIRING DIAGRAM
DI6LE-01

DI-614
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
770 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check transponder key coil (See page BE-181).
NG Replace transponder key coil.
OK
2 Check harness and connector between transponder key amplifier and ECM.
NG Repair of replace harness and connector.
OK
3 Does the system operate normally after replacement of transponder key amplifi-
er?
Yes Replace transponder key amplifier.
No
Replace ECM.

I13606
Transponder Key
Amplifier L-O
W-B+B
GND 1
5 21
3 52B4
B-W
W-B
BatteryEFI Relay
J6
J/C
W-B B2F2
IF16
2G2 2F4
F71
F6 1
B
EDFL MAIN B
4F8
4D8
II BW-BB-W EFI NO. 2 EFI NO. 1
FL Block
T6 Engine Room J/B
J/B No. 4
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-61 1
767 Author
: Date
:
2001 AVALON (RM808U)
Power source circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the Transponder Key ECU
WIRING DIAGRAM
DI6LD-01

DI-612
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
768 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check EFI fuse.
CHECK:
Check continuity of EFI fuse.
OK:
Continuity
NG Replace the failure fuse.
OK
2 Check voltage between terminals EFI and GND of Transponder Key ECU connec-
tor.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the Transponder Key ECU connector.
CHECK:
Measure voltage between terminals +B and GND.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI-604).
NG
3 Check wireharness and connector between Transponder Key ECU and body
ground.
NG Repair or replace wireharness or connector.
OK
Check and repair wirehareness and connec-
tor between Transponder Key ECU and Bat-
tery.