2001 TOYOTA AVALON Service Repair Manual

F07890
1
2 3
4 5 6
7 89 10 11 12
(+) (-)
15
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-275
431 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check brake actuator solenoid.
PREPARATION:
Disconnect the connector from brake actuator.
CHECK:
Check continuity between terminals 10 and each of 1, 2, 3, 4,
5, 6, 7, 8, 9, 11, 12, 15 of brake actuator connector.
OK:
Continuity
NG Replace brake actuator.
OK
2 Check for open and short circuit in harness and connector between ABS & BA &
TRAC & VSC ECU and brake actuator (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.

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

- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-277
433 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the TOYOTA hand-held tester and start from step 2 in case
of not using the TOYOTA hand-held tester.
1 Check ABS motor relay operation.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-held tester.
CHECK:
Check the operation sound of the ABS motor relay individually when operating it with the TOYOTA hand-
held tester.
OK:
The operation sound of the ABS motor relay should be heard.
NG Go to step 3.
OK
2 Check for short circuit in harness and connector between BM of motor relay and
brake actuator and MT of ABS & BA & TRAC & VSC ECU (See page IN-30).
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG

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.

DI-280
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
436 Author
: Date
:
2001 AVALON (RM808U)
DTC C0278 / 11 ABS Solenoid Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.DTC Detecting ConditionTrouble Area
C0278 / 11
Detection of any conditions from 1. through 2.:
1. 3 or more solenoids are show faulty in response and
simultaneously solenoid supply voltage is detected
faulty.
2. Solenoid relay will not be switched OFF.

ABS solenoid relay

ABS solenoid relay circuit
DI6O0-03

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