TOYOTA AVALON 2001 Service Repair Manual

- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-239
395 Author
: Date
:
2001 AVALON (RM808U)
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
5 Check operation of the ABS warning light.
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the ABS ECU.
(c) Turn the ignition switch ON.
CHECK:
Check the ABS warning light goes on.
OK Check and replace combination meter (See
page BE-2).
NG
6 Check for short circuit in harness and connector between active lamp relay and
ABS ECU (See page IN-30).
NG Repeir or replace harness or connector.
OK
Check and replace ABS ECU.

F09801
ABS Actuator
and ECU
A713
Battery J/B No. 3A21
Active Light Relay
Multi DisplayY-B
BRAKEPKB
PKB
Ignition Switch
IF1 A721
EBDW IE15
Y-B
6 5
8 3 Y-G
3B14
3A
6 3B
5
Y-G
B4
15R-W
IE116
R-Y
Y-G
1
P3
Parking
Brake
Switch W-BBody ECU
J1
J/CDriver Side J/B
B1
Bake Fluid
Level Warning
Switch
J/B No. 3
R-W3H
153B
15
15
3A
12
1I8
1H
R-W
1
2
B B
Engine Room J/BDriver Side J/BGAUGE No. 1 IG1 Relay
4
2D4
2F
W-B
ED
R-WR-WIC17
M63
M64R-B
J/B No. 4
13
4F4
4D
R-B
10
1D 1
2
3 44
1C 3
1B1
1G W
IGW-BEngine Room J/BEngine Room R/B No. 57
BAM1
B-L
FL Block
ALT5 512 1
2H 1
2G
1
F8
F10F61
BFL MAIN W-B
142
W-R
W-L
W-L R-Y DI-240
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
396 Author
: Date
:
2001 AVALON (RM808U)
BRAKE Warning Light Circuit
CIRCUIT DESCRIPTION
The BRAKE warning light lights up when the brake fluid is insufficient, parking brake is applied or the EBD
is defective.
WIRING DIAGRAM
DI6NL-02

- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-241
397 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check parking brake switch circuit (See page BE-53).
NG Repair or replace parking brake switch circuit.
OK
2 Check brake fluid level warning switch circuit (See page BE-53).
NG Repair or replace brake fluid level warning
switch circuit.
OK
3 Is DTC output for ABS ?
Yes Repair circuit indicated by the output code.
No
4 Check BRAKE warning light.
See combination meter troubleshooting on page BE-2.
NG Repair or replace combination meter.
OK

DI-242- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
398 Author
: Date
:
2001 AVALON (RM808U)
5 Check active lamp relay.
NG Replace active lamp relay.
OK
6 Check for open or short circuit in harness and connector.
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.

F07888
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-249
405 Author
: Date
:
2001 AVALON (RM808U)
Check for Fluid Leakage
Check for fluid leakage from actuator or hydraulic lines.
DI6NP-01

DI6NC-01
F09803
ABS Actuator and ECU
+B
BAT
GND1
GND2 W-B
FL MAINFL Block
ALT
B-L
BatteryA717
A718
A719
A716 L
L
W-B
EE5 5
12 B
10 2F
42F 12H
12G
W-B
ED 1
F8 1
F6
BABS Engine Room R/B No. 5
Engine Room J/B
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-219
375 Author
: Date
:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC 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
11
When any of the following 1. through 3. is detected:
1. 3 or more solenoids are shown faulty in response and
simultaneously solenoid supply voltage is detected
faulty.
2. Solenoid relay will not be switched OFF.
3. Solenoid relay is frozen in spite of its high valve relay
supply voltage.

ABS solenoid relay

ABS solenoid relay circuit
WIRING DIAGRAM

F00064
LOCK
18
17
16(+) (-) LOCK
(+) (-)
A7 LOCK
19(+) (-)
DI-220- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
376 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminals +B (A7 - 17, 18) and GND (A7 - 16, 19) of ABS
actuator connector.
PREPARATION:
Disconnect the connector from the ABS actuator.
CHECK:
Measure the voltage between terminals A7 - 17, 18 and A7 -
16, 19 of ABS actuator harness side connector.
OK:
Voltage: 10 - 14 V
NG Check and replace fuses.
Check and repair 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.

F09803
ABS Actuator and ECU
+B
BAT
GND1
GND2 W-B
FL MAINFL Block
ALT
B-L
BatteryA717
A718
A719
A716 L
L
W-B
EE5 5
12 B
10 2F
42F 12H
12G
W-B
ED 1
F8 1
F6
BABS Engine Room R/B No. 5
Engine Room J/B
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-221
377 Author
: Date
:
2001 AVALON (RM808U)
DTC 13 ABS Motor Relay Circuit
CIRCUIT DESCRIPTION
The ABS motor relay supplies power to the ABS pump motor. When the ABS is activated, the ECU switches
the ABS motor relay ON and operates the ABS pump motor.
DTC No.DTC Detecting ConditionTrouble Area
13
When any of the following 1. through 3. is detected:
1. Pump motor voltage is not supplied within 0.06 sec. after
actuation of the motor relay.
2. Pump motor voltage is high, and the motor relay will not
actuate for 2.5 sec. or more.
3. Pump motor voltage remains low for longer 0.4 sec. or
more and the pump repeats activating for 0.7 sec. 3
times maximally. After the last activation, the pump mo-
tor is deactivated gone dead because of short circuit.

ABS motor relay

ABS motor relay circuit
WIRING DIAGRAM
DI6ND-01

F00064
LOCK
16(+)(-) LOCK
(+)(-)LOCK
19 1817
(+)(-) A7
DI-222- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
378 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminals +B (A7 - 17, 18) and GND (A7 - 16, 19) of brake
actuator connector.
PREPARATION:
Disconnect the connector from the brake actuator.
CHECK:
Measure the voltage between terminals A7 - 17, 18 and A7 -
16, 19 of brake actuator harness side connector.
OK:
Voltage: 10 - 14 V
NG Check and replace fuses.
Check and repair 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.

F09803
ABS Actuator and ECU
+B
BAT
GND1
GND2 W-B
FL MAINFL Block
ALT
B-L
BatteryA717
A718
A719
A716 L
L
W-B
EE5 5
12 B
10 2F
42F 12H
12G
W-B
ED 1
F8 1
F6
BABS Engine Room R/B No. 5
Engine Room J/B
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-223
379 Author
: Date
:
2001 AVALON (RM808U)
DTC 21 - 24 ABS Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU, and controls the pressure acting on the
wheel cylinders thus controlling the braking force.
DTC No.DTC Detecting ConditionTrouble Area
21, 22, 23, 24Solenoid signal does not match the check result.
Brake actuator

Each solenoid circuit
WIRING DIAGRAM
DI6NE-01