Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 abs ci313233
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DI-233
DIAGNOSTICS - ANTI-LOCK BRAKE SYSTEM
DI8AV-01
DTC 31 - 34 Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
Speed Sensor propriate signals to the ECU. These signals are used to control
Rotor N S Magnet of the ABS system. The front and rear rotors each have 48
Coil
serrations.
To ECU When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
Low Speed
tion to the speed of the rotor, the frequency is used by the ECU
High Speed to detect the speed of each wheel.
+V
BR3583 -V F00010
BR3582
DTC No. DTC Detecting Condition Trouble Area
Detection of any of conditions from 1. through 4.:
1. With vehicle speed at 10 km/h or more, sensor signal
circuit of faulty wheel is open or short for 15 sec. or long-
S Right front, left front, right rear, left rear speed sensor
er.
S Each speed sensor circuit
31, 32, 33, 34 2. Momentary interruption of sensor signal of faulty wheel
S Sensor installation
has occurred 7 times or more.
S Sensor rotor
3. With vehicle speed at 20 km/h or more, sensor signal of
faulty wheel generated noise for 5 sec. or longer.
4. Sensor signal circuit is open for 0.3 sec. or longer.
HINT:
DTC No. 31 is for the right front speed sensor.
DTC No. 32 is for the left front speed sensor.
DTC No. 33 is for the right rear speed sensor.
DTC No. 34 is for the left rear speed sensor.
2001 SIENNA (RM787U)
Author : Date : 387
DI-234
DIAGNOSTICS - ANTI-LOCK BRAKE SYSTEM
WIRING DIAGRAM
(Shielded) 4 (Shielded)
IK5 Skid Control ECU
BR 7 22
IK5 BR FR+
ABS Speed 1
Sensor
Front RH
2 3
Y Y 21
IK5 FR-
(Shielded)
L 20 FL+
1
ABS Speed
Sensor
Front LH
2
P 19
FL-
(Shielded) (Shielded) (Shielded)
8 2
W W W 18
BA2 IC2 RR+
ABS Speed 2
Sensor
Rear RH
1 9 10
B B B 17
BA2 IC2 RR-
2 3
R BA2 R R 16 RL+
IC2
ABS Speed 2
Sensor
Rear LH
1 6 11
G G G 10
BA2 IC2 RL-
7 9
BA2 BR-W
IC2
(Shielded) W-B
10
BR-W
BA2 ED
F03911
2001 SIENNA (RM787U)
Author : Date : 388
DI-235
DIAGNOSTICS - ANTI-LOCK BRAKE SYSTEM
INSPECTION PROCEDURE
1 Check speed sensor.
Front:
PREPARATION:
1 (a) Remove the front fender liner.
(b) Make sure that there is no looseness at the connector
2 lock part and connecting part of the connector.
(c) Disconnect the speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
R14205 connector.
OK:
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