2001 TOYOTA AVALON Service Repair Manual

DI6NX-03
BR3583
BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
+V
-VHigh Speed
Low Speed
CoilNS
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-267
423 Author
: Date
:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC
C0200 / 31 - C1331 / 36Speed Sensor Circuit
DTC
C1332 / 38, C1333 / 39Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects a wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
of the ABS and VSC system. Each of the front and rear rotors
has 48 serrations.
When the rotors rotate, a magnetic field emitted by a permanent
magnet in the speed sensor generates an AC voltage. Since
the frequency of this AC voltage changes in direct proportion to
the speed of the rotor, the frequency is used by the ECU to de-
tect the speed of each wheel.

DTC No.DTC Detecting ConditionTrouble Area
C0200 / 31
C0205 / 32
C0210 / 33
C0215 / 34
When any of the following 1. to 3. is detected :
1. Vehicle speed is more than 40 km/h (25 mph), pulses
are not input for 0.01 sec.
2. After the initial start or restart and when the vehicle
speed has reached 12 km/h (7 mph), the wheel speed of
0 km/h (0 mph) is detected.
3. After the initial start or restart and when the vehicle
speed has reached 18 km/h (11 mph), the front wheel
speed of 0 km/h (0 mph) is detected.

Right front, left front, right rear, left rear speed sensor

Each speed sensor circuit

Sensor installation
C1330 / 35
C1331 / 36
C1332 / 38
C1333 / 39
Detecting abnormality in the resistance value of each speed
sensor.
Right front, left front, right rear, left rear speed sensor

Each speed sensor circuit
HINT:

DTC No. C0200 / 31 and C1330 / 35 are for the right front speed sensor.

DTC No. C0205 / 32 and C1331 / 36 are for the left front speed sensor.

DTC No. C0210 / 33 and C1332 / 38 are for the right rear speed sensor.

DTC No. C0215 / 34 and C1333 / 39 are for the left rear speed sensor.

F09825
(Shielded)
FR-
2
IE1A2016
BR B-W
J4
J/C (Shielded) 1
A9
Right Front
Speed Sensor
19
IE1 18
IE120
BR-W
A
AA
A
BR
(Shielded)ABS & BA & TRAC
& VSC ECU
FR+ A2017
FL-
A2010
FL+ A208 L
B-R
BR (Shielded)
B-R
BR
2 1
A8
Left Front
Speed Sensor
A
(Shielded)RR-
A2012
RR+ A2011
RL-
A2014
RL+ A2013 V
LG
(Shielded) V
LG
(Shielded)Y
GIK110
IK1 11
IK112Y
G
ID111
ID1 21
ID122 2
1 A30
Right
Rear
Speed
Sensor
2
1 A29
Left
Rear
Speed
Sensor
IGBR
BR-W DI-268
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
424 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM

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