2001 TOYOTA AVALON Service Repair Manual

DI6LA-01
F07887DLC3Hand-held
Tester
N09214
DLC3
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-599
755 Author
: Date
:
2001 AVALON (RM808U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Description
ECM controls the function of immobiliser on this vehicle.
Data of the immobiliser or DTC can be read form DLC3 of
the vehicle. When a trouble occurs on immobiliser, check
engine warning light does not light up but DTC inspection
is performed.
Therefore when there seems to be a trouble on immobilis-
er, use hand-held tester or SST to check and trouble-
shoot it.
(b) Check the DLC3.
The vehicle's ECM uses ISO 14230 for communication.
The terminal arrangement of DLC3 complies with SAE
J1962 and matches the ISO 14230 format.
Terminal No.Connection / Voltage or ResistanceCondition
7Bus
Line / Pulse generationDuring transmission
4Chassis Ground e Body Ground / 1 W or lessAlways
16Battery Positive e Body Ground / 9 ~ 14 VAlways
HINT:
If your display shows ºUNABLE TO CONNECT TO VEHICLEº
when you have connected the cable of the hand-held tester to
DLC3, turned the ignition switch ON and operated the hand-
held tester, there is a problem on the vehicle side or tool side.

If communication is normal when the tool is connected to
another vehicle, inspect DLC3 on the original vehicle.

If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool's instruction manual.

DI-600
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
756 Author
: Date
:
2001 AVALON (RM808U)
2. INSPECT DIAGNOSIS (Normal Mode)
(a) Check the DTC using hand-held tester.
NOTICE:
Hand- held tester only: When the diagnosis system is
switched from normal mode to check mode, it erases all
DTCs and freezed frame data recorded in normal mode. So
before switching modes, always check the DTCs and
freezed frame data, and note them down.
(1) Prepare the hand-held tester.
(2) Connect the hand-held tester to DLC3.
(3) Turn the ignition switch ON and push the hand-held
tester main switch ON.
(4) Use the hand-held tester to check the DTCs and
freezed frame data, note them down. (For operating
instructions, see the hand-held tester instruction
book.)
(5) See page DI-601 to confirm the details of the DTCs.
(b) Clear the DTC.
The following operations will erase the DTCs and freeze
frame data.
(1) Operating the OBD ll scam tool (complying with
SAEJ1978) or hand-held tester to erase the codes.
(See the OBD ll scan tool's instruction book for op-
erating instructions.)
(2) Disconnecting the battery terminals or EFI fuse.

DI1AP-17
DI-604
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
760 Author
: Date
:
2001 AVALON (RM808U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Immobiliser is not set.
(Engine starts with key codes other than the registered key code.)1. ECMIN-30
Engine does not start.
1. Key
2. Wire harness
3. Transponder key coil
4. Amplifier
5. ECM*1
IN-30
DI-613
IN-30
Security indicator is always ON.
1. Security indicator
2. Wire harness
3. ECM*2
IN-30
IN-30
Security indicator is always ON.
(Although code has been registered in the automatic registration
mode, indicator is not OFF.)1. Wire harness
2 Transponder key coil
3. Amplifier
4. ECMIN-30
DI-613
IN-30
Security indicator is OFF.
(When DTC of immobiliser is output)
1. Wire harness
2 Transponder key coil
3. Amplifier
4. ECMIN-30
DI-613
IN-30
Security indicator is OFF.
(When DTC of immobiliser is not output)1. Wire harness
2. ECMIN-30
IN-30
Security indicator is abnormally blinking.1. Wire harness
2. ECMIN-30
IN-30
*1 : Check that the key which did not start the engine has been registered and that it is possible to start with
other already registered key.
*2 : Finish the automatic registration mode because the mode might still remain.

DI6LB-01
D01054
E4
E5
E7E8 E6
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-603
759 Author
: Date
:
2001 AVALON (RM808U)
TERMINALS OF ECM
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
CODE e E1
(E7-28 e E5-17)P-G e BRIgnition Switch ON10 - 14
TXCT e E1
(E7-18 e E5-17)L-Y e BRIgnition Switch ON10 - 14
IGSW e E1
(E8-2 e E5-17)B-O e BRIgnition Switch ON10 - 14
RXCK e E1
(E7-19 e E5-17)L-O e BRIgnition Switch ON10 - 14

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

I11589
(-) 8 (+B)
(+)7 (GND)
I11590
(-)
(+)8 (GND)
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-495
651 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminals +B and GND of Seat Position Control ECU con-
nector.
PREPARATION:
Remove Seat Position Control ECU with connectors still con-
nected.
CHECK:
Measure voltage between terminals +B and GND of Seat Posi-
tion Control ECU connector.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown on
problem symptom table (See page DI-493).
NG
2 Check continuity between terminals GND of Seat Position Control ECU connec-
tor and body ground.
CHECK:
Measure resistance between terminals GND of Seat Position
Control ECU connector and body ground.
OK:
Resistance: Continuity (below 1 W)
NG Repair or replace harness or connector.
OK

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.

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