Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 524

VDC-25

Front ABS Wheel Speed Sensor

VEHICLE DYNAMICS CONTROL (VDC)

2. ABS WHEEL SPEED SENSOR

1) Check the tip of the ABS wheel speed sensor for

foreign particles or damage. If necessary, clean the

tip or replace the ABS wheel speed sensor.

2) Check the ABS wheel speed sensor cable for

discontinuity. If defective, replace the ABS wheel

speed sensor.

3) Connect a 12 V power supply to No. 2 terminal of

sensor connector as shown in the figure, then at-

tach resistance to the No. 1 terminal. Rotate the

wheel at about 2.75 km/h (2 MPH), and measure

the voltage using an oscilloscope.
Standard value of output voltage:

0.7 — 1.4 V

4) Replace the ABS wheel speed sensor if the in-

spection result is not within the standard value.

(1) Oscilloscope
(2) ABS wheel speed sensor

ABS00388

(2)

(1)

100

1.4 V

0.7 V

12 V

2

1

1

2

VDC-26

Rear ABS Wheel Speed Sensor

VEHICLE DYNAMICS CONTROL (VDC)

9. Rear ABS Wheel Speed Sen-

sor

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Disconnect the connector from the rear ABS

wheel speed sensor.

3) Remove the sensor harness clamp of the rear

sub frame.

4) Remove the bolts and then remove the sensor

harness bracket from the upper arm.

5) Remove the bolts, and remove the rear ABS

wheel speed sensor from the rear axle.
CAUTION:

• Be careful not to damage the sensor.

• Do not apply excessive force to the sensor

harness.

B: INSTALLATION

CAUTION:

Be careful not to damage the sensor.

Install each part in the reverse order of removal.
Tightening torque:

Sensor:

7.5 N·m (0.76 kgf-m, 5.5 ft-lb)

Bracket:

7.5 N·m (0.76 kgf-m, 5.5 ft-lb)

NOTE:

Check the identification (mark) on the harness to

make sure there is no warpage. (RH: P5 (White),

LH: P6 (Yellow))

C: INSPECTION

1. ABS WHEEL SPEED SENSOR

Refer to “INSPECTION” in “Front ABS Wheel

Speed Sensor”. <Ref. to VDC-24, INSPECTION,

Front ABS Wheel Speed Sensor.>

RS-00266

ABS-01015

RS-00257

FU-03357

VDC-27

Front Magnetic Encoder

VEHICLE DYNAMICS CONTROL (VDC)

10.Front Magnetic Encoder

A: REMOVAL

Refer to “Front Hub Bearing” for removal, because

the front magnetic encoder is integrated with front

hub bearing. <Ref. to DS-18, REMOVAL, Front

Hub Unit Bearing.>

B: INSTALLATION

Refer to “Front Hub Bearing” for installation, be-

cause the front magnetic encoder is integrated with

front hub bearing. <Ref. to DS-19, INSTALLATION,

Front Hub Unit Bearing.>

C: INSPECTION

Visually check the magnetic encoder for any dam-

age. If necessary, replace with a new hub unit bear-

ing.
NOTE:

Because the magnetic encoder is integrated with

hub unit bearing assembly, replace the hub unit

bearing with a new part if there is any defect found

on the magnetic encoder.

VDC-28

Rear Magnetic Encoder

VEHICLE DYNAMICS CONTROL (VDC)

11.Rear Magnetic Encoder

A: REMOVAL

Refer to “Rear Hub Unit Bearing” for removal, be-

cause the rear magnetic encoder is integrated with

rear hub unit bearing. <Ref. to DS-24, REMOVAL,

Rear Hub Unit Bearing.>

B: INSTALLATION

Refer to “Rear Hub Unit Bearing” for installation,

because the rear magnetic encoder is integrated

with rear hub unit bearing. <Ref. to DS-25, INSTAL-

LATION, Rear Hub Unit Bearing.>

C: INSPECTION

Visually check the magnetic encoder parts for any

damage. If necessary, replace with a new hub unit

bearing.
NOTE:

Because the magnetic encoder is integrated with

hub unit bearing assembly, replace the hub unit

bearing with a new part if there is any defect found

on the magnetic encoder.