Page 1026 of 1897
A11665
IG Switch
BatteryECM Engine Room J/B
MAIN
Park/Neutral
Position SwitchAM2
W-B
Starter
B
58
3
2
110
4
1
B-W2C 2G2A
S1E8 ST Relay
E1 STA 7 1
ED
B-R B-R
II2
W-R
W-B
4
2D
42F 2A6
3
2B2
B-R 8
7
II1
B-W
FL
MainJ1
J/C
B-R
S212C7
7
B
IF1
1F74
W-R
B-R F6Fusible
Link
Block6 512
B
B
W-B DI-142
- DIAGNOSTICSENGINE
298 Author: Date:
2001 AVALON (RM808U)
Starter Signal Circuit
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after-start injection control.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the problem symptoms table on page DI-22.
DI08B-09
Page 1052 of 1897
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
Page 1055 of 1897
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
Page 1057 of 1897
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
Page 1059 of 1897
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
Page 1069 of 1897
DI0FY-1 1
I13620
BatteryPower Seat ECU
FL MAIN+B
FL Block
GND SGND
W-BL-O L-O
L-O BR
BRBR
BR
W
A11
CC8
7 19
9 9
7 8 1
11
B A
ABB
J13
J/CJ14
J/C
J11
J/CJ14 J/C
W-B PWR SEAT Driver Side J/B
BRP21 BC1 IA1
P20 1
BC1 ID2 1I 1G
F10F6
IH
BKW-BP20
BC1 DI-494
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
650 Author: Date:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
+B Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for motors such as the slide motor, reclining motor, front vertical motor and rear
vertical motor.
WIRING DIAGRAM
Page 1071 of 1897
DI-496- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
652 Author: Date:
2001 AVALON (RM808U)
3 Check POWER SEAT fuse.
NG Check for short in all the harness and compo-
nents connected to the POWER SEAT fuse, and
repair them (See attached wiring diagram).
OK
Check and repair harness or connector be-
tween Seat Position Control ECU and battery.
Page 1072 of 1897
I13626
SGND
SYSB J14
J/C
25 19
3C5
FL MAIN
BatteryEngine Room J/B J/B No. 3
IHP21
P21
W-G
DCC ECU-B
FL BlockB
BR BRB 9
BC1
BR 9
IA1
BR
J13
J/C A
A3E14
W-G W-G5
BC1
Driver Side J/B
1B9
1J9
W-L
2C1
2G2
B
F71
F61
B
BRPower Seat ECU
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-497
653 Author: Date:
2001 AVALON (RM808U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power for ECU operation and is also the power source for the sensor.
WIRING DIAGRAM
DI0G1-09
