TOYOTA AVALON 2001 Service Repair Manual

R14205
1
2
R14213
1
2
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-269
425 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check speed sensor.
Front:
PREPARATION:
(a) Remove the front fender liner.
(b) Disconnect the speed sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of speed
sensor connector.
OK:
Resistance: 0.6 - 2.5 kW (1.6 ± 0.2 kW at 20 °C)
CHECK:
Measure the resistance between terminals 1 and 2 of speed
sensor connector and body ground.
OK:
Resistance: 1 MW or higher
Rear:
PREPARATION:
(a) Remove the seat cushion and seatback.
(b) Disconnect the speed sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of speed
sensor connector.
OK:
Resistance: 1.2 - 2.3 kW (1.6 ± 0.1 kW at 20 °C)
CHECK:
Measure the resistance between terminals 1 and 2 of speed
sensor connector and body ground.
OK:
Resistance: 1 MW or higher
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-252).
OK

BR3795
OK NG OK NG
OK NGOK NG
DI-270
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
426 Author
: Date
:
2001 AVALON (RM808U)
2 Check for open and short circuit in harness and connector between each speed
sensor and ABS & BA & TRAC & VSC ECU (See page IN-30).
NG Repair or replace harness or connector.
OK
3 Check speed sensor installation.
CHECK:
Check the speed sensor installation.
OK:
The installation bolt shall be tightened properly and
no clearance is allowed between the sensor and front
steering knuckle or rear axle carrier.
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-252).
OK

W04200
Normal Signal Waveform
2 m/s / DivisionGND
1 V / Division
R00948
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-271
427 Author
: Date
:
2001 AVALON (RM808U)
4 Check speed sensor and sensor rotor serrations.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Disconnect the connector from the ABS & BA & TRAC &
VSC ECU.
(b) Connect the oscilloscope to the terminals FR+, FL+, RR+
or RL+ and GND of the ECU harness side connector.
CHECK:
Drive the vehicle at about 30 km/h (19 mph), and check the sig-
nal waveform.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
5 Check sensor rotor and sensor tip.
Front:
PREPARATION:
Remove the front drive shaft (See page SA-16).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects.
PREPARATION:
Remove the front speed sensor (See page BR-60).
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.

R00947
DI-272
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
428 Author
: Date
:
2001 AVALON (RM808U)
Rear:
PREPARATION:
Remove the axle hub (See page SA-45).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects.
PREPARATION:
Remove the rear speed sensor (See page BR-63).
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
NG Replace sensor rotor or speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-252).
OK
Check and replace ABS & BA & TRAC & VSC
ECU.

- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-273
429 Author
: Date
:
2001 AVALON (RM808U)
DTCC0226 / 21 - C1228 / 28Brake Actuator 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
C0226 / 21Open or short in SFRR or SFRH circuit.
Brake actuator

SFRR or SFRH circuit
C0236 / 22Open or short in SFLR or SFLH circuit.
Brake actuator

SFLR or SFLH circuit
C0246 / 23Open or short in SRRR or SRRH circuit.
Brake actuator

SRRR or SRRH circuit
C0256 / 24Open or short in SRLR or SRLH circuit.
Brake actuator

SRLR or SRLH circuit
C1225 / 25Open or short circuit for SMC1 circuit.
Brake actuator

SMC1 circuit
C1226 / 26Open or short circuit for SMC2 circuit.
Brake actuator

SMC2 circuit
C1227 / 27Open or short circuit for SRC1 circuit.
Brake actuator

SRC1 circuit
C1228 / 28Open or short circuit for SRC2 circuit.
Brake actuator

SRC2 circuit
DI6NY-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 DI-274
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
430 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM

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