engine TOYOTA AVALON 2001 Service Repair Manual

- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-323
479 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check that the ECU connectors are securely connected to the ECU.
NO Connect the connector to the ECU.
YES
2 Is DTC output?
Check DTC on page DI-252.
YES Repair circuit indicated by the output code .
NO
3 Does VSC warning light go off?
YES Check for open or short circuit in harness and
connector between ECU-IG fuse and ECU (See
page IN-30).
NO
4 Check battery positive voltage.
PREPARATION:
Start the engine.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 - 16 V
NG Check and repair the charging system (See
page CH-1).
OK

F09823
ABS & BA &
TRAC & VSC ECU
WA A2081
47 1
B
W-B
B
BJ4
J/C
W-B W-B
IG Battery FL MAINA21
Active
Light
Relay
F10F8 F61 1
1ALT
W W
W-B
B-L
2G
2H 11
5512 AM1
B
W-LIF17 W-L 22
Y-R
IG1 AM1 4
Ignition Switch W-R 1B 1C1G1B1D
4
3 4 3 1
1
213 10 GAUGE No. 1
ECU-IG
No. 2
Y-R3C
3D 2
11 R-B
R-B 4D
4FM6M6
4
Multi
Display 13 45 R-LR-L
4A4B
4H15
15 15
R-L 14
E1
ABS D2
DLC2
ABS
J/B No. 4
J/B No. 3 Driver Side J/B
Engine Room J/B
Engine Room R/B No. 5J/B No. 4
FL Block IG1
Relay
B
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-319
475 Author
: Date
:
2001 AVALON (RM808U)
DTC Always ON Malfunction in ECU
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
Always ON
Either of the following 1., 2. or 3. is detected:
1. The ECU connectors are OFF the ECU.
2. There is a malfunction in the ECU internal circuit.
3. There is a malfunction in ABS warning light circuit.

Charging system

ABS warning light circuit
HINT:
TOYOTA hand-held tester may not be able to be used when the ECU is defective.
WIRING DIAGRAM
DI6OG-02

DI-320
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
476 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check that the ECU connectors are securely connected to the ECU.
NO Connect the connector to the ECU.
YES
2 Is DTC output?
Check DTC on page DI-252.
YES Repair circuit indicated by the output code .
NO
3 Does ABS warning light go off?
YES Check for open or short circuit in harness and
connector between ECU-IG fuse and ECU (See
page IN-30).
NO
4 Check battery positive voltage.
PREPARATION:
Start the engine.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 - 16 V
NG Check and repair the charging system (See
page CH-1).
OK

F09824
Battery
FL MAIN F10 F8
F611 1
ALT
BFL BlockB-L 2G 2H1 1 Engine Room J/B B5512 AM1 Engine Room R/B No. 5 W-LIF17
W-L
2
IG1 AM1 4Ignition Switch W-R W
1C 1G
1B 1D
4
4 3 1
1
2
3 10 GAUGE No. 1 Driver Side J/B
IG1 Relay
W-B
IG
ED CUP
BRAKE
Multi DisplayM6 M3M6R-B
3 4
74D 4F13
4 J/B No. 4
R-B
L-O L-O6
IL1
R-WR-W
R-W
R-W
7
IC13A21
Active
Light
RelayR-Y 8A20
6040 74 68
32 ABS & BA &
TRAC & VSC ECU
FSS LBL PKB EBDW SP1
T5
T5
T5
T5 T5
Y-G
L-B
BR (Shielded)15
25 16
2
11
LBL LVL2PKB2BRL
PKB
Y-G Y-G
R-W
R-WJ/B No. 3
3B 3A
3A 3B 5
15
15 14
1Driver Side J/B
B1
Brake Fluid Level
Warning Switch Translate ECU
1H
1I 12
8
R-W
1 2
W-B J1 J/C
B B
W-BEngine Room J/B
44
2D2FW-B P3
Parking
Brake
SwitchA20
A20
A20
A20 DI-330
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
486 Author
: Date
:
2001 AVALON (RM808U)
BRAKE Warning Light Circuit
CIRCUIT DESCRIPTION

The BRAKE warning light lights up when the brake fluid is insufficient, when the parking brake is ap-
plied or when the EBD is defective.

If the translate ECU detects trouble, it makes VSC warning light lights up while prohibiting VSC & TRAC
control. At this time, the ECU records a DTC in memory. Connect terminals Tc and E
1 of the DLC1 or
DLC2 to make BRAKE warning light blink and output the DTC.
WIRING DIAGRAM
DI6OK-02

F09826
ABS & BA & TRAC
& VSC ECU
R+
SR
SFRH
SFRR
SFLH
SFLR
SRRH
SRRR
SRLH
SRLR
SMC1
SMC2
SRC1
SRC2 GR-R J/B No. 3
IF3Engine Room J/B No. 3
ABS
No. 2Engine
Room
J/BIE1
B-W2
A20
63A 19
3H GR-R
21
GR-RABS Solenoid Relay
FL
Block3
3 3 4
1
3 3
32 W
W-B
8 2F
10 2F
1 2G
1 F8
1 F6
B
FL
MAIN
Battery
EDW-BABS & BA & TRAC
& VSC ActuatorW-L RR176
36
A20
BS
SFRH
SFRR
SFLH
SFLR
SRRH
SRRR
SRLH
SRLR
SMC1
SMC2
SRC1
SRC226
A20
55
A20
5
A20
3
A20
6
A20
4
A20
53
A20
25
A20
49
A20
50
A20
54
A20
52
A20 W-G
W-R
G-O
GR
G-R
Y-B
L-Y
G-Y
V-W
B-Y
R-B B-W
W-G
W-R
G-O
GR
G-R
Y-B
L-Y
G-Y
V-W
B-Y
R-BIE12
IE13
IE14
IE15
IE16
IE17
IE110
IE111
IE112
IE113
IE114
IE115 2
A5
9
A5
11
A5
7
A5
8
A5
4
A5
5
A5
1
A5
3
A5
3
A6
2
A6
5
A6
4
A6 4
2F
B-L
ALT DI-274
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
430 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM

F09816
ABS & BA & TRAC
& VSC ECU
Engine RoomR/B No. 3
J/B No. 3
FL Block
FL MAIN7
A20
MR
2
A20 R+
27
A20
MT GR-L
ABS Motor Relay
W
B-L
Battery6
IE1
W-B
ABS GR-L
6
3AGR-R GR-R GR-R
3
3 3
31
23 4
Engine Room J/B 21
IF3
ALTABS No. 419
3H
ABS & BA & TRAC& VSC Actuator
6
A510
A5 L
L
OOEE
IF3
3 Engine Room R/B No. 5
12
215
5 5
5
B1
F61
F81
2G1
2H B DI-276
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
432 Author
: Date
:
2001 AVALON (RM808U)
DTC C0273 / 13 ABS Motor Relay Circuit
CIRCUIT DESCRIPTION
The ABS motor relay supplies power to the brake actuator pump motor. While the ABS & BA & TRAC & VSC
are activated, the ECU switches the motor relay ON and operates the brake actuator pump motor.
DTC No.DTC Detecting ConditionTrouble Area
C0273 / 13Open or short circuit is detected.
ABS motor relay

ABS motor relay circuit
WIRING DIAGRAM
DI6NZ-03

F07899
Engine Room R/B No. 8
LOCK1
F00044
1
2
3 4
(+) (-) Continuity1 2
3 4
1
2
3 4 Open
Continuity
DI-278
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
434 Author
: Date
:
2001 AVALON (RM808U)
3 Check voltage between terminal 1 of engine room R/B No. 8 (for ABS motor
relay) and body ground.
PREPARATION:
Remove ABS motor relay from engine room R/B No. 8.
CHECK:
Measure the voltage between terminal 1 of engine room R/B
No. 8 (for ABS motor relay) and body ground.
OK:
Voltage: 10 - 14 V
NG Check and repair harness or connector.
OK
4 Check ABS motor relay.
CHECK:
Check continuity between following terminals of motor relay.
OK:
Terminals 3 and 4Continuity
(Reference value 62 W)
Terminals 1 and 2Open
CHECK:
(a) Apply battery positive voltage between terminals 3 and 4.
(b) Check continuity between terminals.
OK:
Terminals 1 and 2Continuity
NG Replace ABS motor relay.
OK

F07900
Engine Room R/B No. 8 ABS Motor Relay
2
ECUBrake Actuator
13 27
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-279
435 Author
: Date
:
2001 AVALON (RM808U)
5 Check continuity between terminal BM (2) of engine room R/B No. 8 (for ABS mo-
tor relay) and terminal MT (27) of ABS & BA & TRAC & VSC ECU.
PREPARATION:
Disconnect the connector from the ABS & BA & TRAC & VSC
ECU.
CHECK:
(a) Check continuity between terminal BM (2) of engine room
R/B No. 8 and terminal GND (28) of ABS & BA & TRAC
& VSC ECU.
(b) Check continuity between terminal BM (2) of engine room
R/B No. 8 and terminal MT (27) of ABS & BA & TRAC &
VSC ECU.
OK:
Continuity
NG Repair or replace harness or brake actuator.
OK
6 Check for open and short circuit in harness and connector between ABS motor
relay and ABS & BA & TRAC &VSC ECU (See page IN-30).
NG Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection. If the connections are normal, the ECU may be defective.

F09826
ABS & BA & TRAC
& VSC ECU
R+
SR
SFRH
SFRR
SFLH
SFLR
SRRH
SRRR
SRLH
SRLR
SMC1
SMC2
SRC1
SRC2 GR-R J/B No. 3
IF3Engine Room J/B No. 3
ABS
No. 2Engine
Room
J/BIE1
B-W2
A20
63A 19
3H GR-R
21
GR-RABS Solenoid Relay
FL
Block3
3 3 4
1
3 3
32 W
W-B
8 2F
10 2F
1 2G
1 F8
1 F6
B
FL
MAIN
Battery
EDW-BABS & BA & TRAC
& VSC ActuatorW-L RR176
36
A20
BS
SFRH
SFRR
SFLH
SFLR
SRRH
SRRR
SRLH
SRLR
SMC1
SMC2
SRC1
SRC226
A20
55
A20
5
A20
3
A20
6
A20
4
A20
53
A20
25
A20
49
A20
50
A20
54
A20
52
A20 W-G
W-R
G-O
GR
G-R
Y-B
L-Y
G-Y
V-W
B-Y
R-B B-W
W-G
W-R
G-O
GR
G-R
Y-B
L-Y
G-Y
V-W
B-Y
R-BIE12
IE13
IE14
IE15
IE16
IE17
IE110
IE111
IE112
IE113
IE114
IE115 2
A5
9
A5
11
A5
7
A5
8
A5
4
A5
5
A5
1
A5
3
A5
3
A6
2
A6
5
A6
4
A6 4
2F
B-L
ALT
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-281
437 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM

F07891
LOCK
1
2
Engine R/B No. 8
DI-282
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
438 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminals 1 and 2 of engine room R/B No. 8 (for ABS so-
lenoid relay).
PREPARATION:
Remove the ABS solenoid relay from engine room R/B No. 8.
CHECK:
Measure the voltage between terminals 1 and 2 of engine room
R/B No. 8 (for ABS solenoid relay).
OK:
Voltage: 10 - 14 V
NG Check and repair harness or connector.
OK