Bendix® WS-24™
Speed Sensors
Exciter
Ring
Front Wheels

Rear Wheels

Figure 5 – Typical Antilock System
2. Use a volt-ohm meter to measure the resistance across
the connector terminals, at an ambient temperature
range of 0°F to 100°F (-18°C to 38°C) sensor resistance
range can be 1200 to 2700 ohms. Record your
measurements.
OK - between 1200 and 2700 ohms.
Not OK - less than 1200 or more than 2700 ohms.
Resistance measurement = _______________.
If OK, continue to Step 3.
If Not OK, replace the sensor and clamping sleeve.
3. Confirm that wheel chocks are in place on the vehicle.
Raise the wheel off the ground to test the suspect wheel
speed sensor.
4. Release the parking brakes.
5. By hand, slowly rotate the wheel at a rate of at least ½
revolution per second. Using an AC rms voltage meter,
measure the voltage at the ECU across the sensor
terminals and record your measurement.
OK - Output voltage is 0.25 Volt AC minimum.
Not OK - Output voltage is less than 0.25 Volt AC.
AC voltage measurement = _______________.
6. If voltage is not OK, reposition the sensor by gently
pushing it closer toward the wheel until it touches the
exciter ring. Repeat the voltage measurement.
AC voltage measurement = _______________.
If still not OK, replace the sensor and the clamping sleeve.

Speed Sensor
Mounting Block
100 Tooth (typical)
Speed Sensor
Exciter Ring

Mounting
Block

Brake Drum

Max. Gap
(Sensor to Exciter)
.015 Inches

WS-24 Wheel
Speed Sensor
100 Tooth
Exciter
Ring

Bendix® WS-24™
Wheel Speed Sensor
(90°)
Hub
Assembly

Figure 6 – WS-24 Wheel Speed Sensor Installation
7. If the resistance and voltage readings are OK, the sensor
itself is not the cause of the Diagnostic Trouble Code
(DTC). Reconnect the sensor and examine the wiring
harness and ECU connector for causes of failure, such
as pinched wires, loose pins, abrasions, exposed wires,
etc.

3. Install the new clamping sleeve fully into the block, with
the retaining tabs toward the inside of the vehicle.

8. After repair, re-check the system before returning the
vehicle to service. If necessary, drive the vehicle to
confirm the system is functioning correctly.

5. Apply a moderate amount of dielectric non-conductive
grease to both the sensor connector and the harness
connector.

SENSOR REMOVAL
Before disconnecting any electrical connections at the wheel
end, remove as much contamination from the connector as
possible to preserve the sealing integrity of the connection.
1. Unplug the cable assembly connector from its lead. Lift
the lock tab and pull on the connector until it disengages.
2. Gently pry the sensor and clamping sleeve from the
mounting block.

4. Gently push (DO NOT STRIKE) the sensor into the
mounting block hole until it bottoms out on the face of
the tone ring. Secure the cable lead wire to the knuckle/
axle housing 3-6 inches from the sensor.

6. Engage the connectors, and push together until the lock
tab snaps into place.
NOTE: It is important for the wheel bearings to be
adjusted per the manufacturer’s recommendations.
Excessive wheel end play can result in excessive air gap
where the sensor is pushed too far away from the tone
ring leading to loss of ABS or Stability Control systems.

SENSOR INSTALLATION
1. When using clamping sleeve – Bendix® part number
5012878 – it is recommend a high-temperature rated
silicon- or lithium-based grease be applied to the interior
of the mounting block for better corrosion protection.
2. When using stainless steel clamping sleeve – Bendix®
part number K152407 – it is required to apply a hightemperature rated silicon- or lithium-based grease
to the sensor body. This lubrication will keep the
movement between the sensor and the clamping sleeve
independent from one another.
5

OPERATIONAL TESTING
There are multiple ways to verify the wheel speed sensor
has been installed properly.
Prior to connecting the sensor to its mating connector, raise
the vehicle wheel so it rotates easily. Connect a volt-ohm
meter to the sensor leads, set the meter to AC volts, spin
the wheel (approximately 0.5 revolutions per second). The
output voltage should read greater than 0.250 V.
Test Drive: it is recommended to test drive the vehicle to
verify the repair in a dynamic state. Test drive the vehicle
in a safe area to a minimum speed of 15 mph. Be sure to
make multiple right and left hand turns while driving, start
and stop the vehicle with the brakes several times. Observe
the following:
1. ABS dash lamp should not be illuminated after the test
drive.

2. The Light Emitting Diode (LED) display on the Bendix
controller, if so equipped, should only have the green
LED illuminated.
3

If Bendix® ACom® diagnostic software is available: During
the drive, wheel sensor output can be monitored and
recorded in the ACom diagnostic wheel speed window.
All sensors should record speeds.

If the sensor fails to operate as described, check the wiring
from the controller to the sensor. Make sure all connectors are
properly, and tightly, installed. Check for frayed or damaged
wires. For additional troubleshooting information reference
Bendix® Wheel Speed Sensor Checklist (BW2453 available
for download on bendix.com), or see the troubleshooting
procedure for the specific ABS system in use.

Log-on and Learn from the Best

On-line training that's available when you are
Visit brake-school.com.

6

24/7/365.

SD-13-4860 Rev. 002 © 2019 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group • 04/19 • All Rights Reserved

INSPECTION PROCEDURE
ABS Wheel Speed Sensor Water Intrusion

34-085

Wheel Speed Sensor Inspection

1. Cut the cable ties securing the connector to the harness as shown in Figure 1.
Figure 1

2. Remove the back shell of the connector as shown in Figure 2.
Figure 2

2/13/2020

34-085

Page 1 of 2

Title of bulletin
3. Visually inspect the rubber seals to make sure they are flush with the back of the connector as
illustrated in Figure 3. If necessary, slide the seal(s) into place with your fingers.
Figure 3

4. If the seal was not correctly installed, carefully open the connector (Figure 4) and visually inspect
for signs of corrosion. If any corrosion is found, replace the sensor and/or harness as necessary.
Verify the O-ring is installed on the connector and undamaged.
Figure 4

5. Reassemble the connector as it was found, with cable ties securing the connector together.
6. Secure the harness bundle in the original location with cable ties.
7. Using the same method, check all other wheel speed sensor connectors.

2/13/2020

34-085

Page 2 of 2

TIB 34-085 - ABS Wheel Speed Sensor Corrosion

Page 1 of 3

Technical Information Bulletin
34-085

Section
Wiring and Lighting - 34

Subject
ABS Wheel Speed Sensor Corrosion

Release Date
3/3/2020

Condition
Wheel speed sensor related fault codes might be present in the ABS system.

Chassis Affected
Chassis built from 09/14/2004 through 08/07/2018 with ABS.

Action
Information Only
This bulletin is to inform dealers of possible repair paths for incorrectly installed wheel speed sensor connector seals.

Warranty
Through Standard Warranty or any applicable active Extended Warranty, Kenworth will pay for parts at dealer net plus applicable mark-up and
labor.
For repairs made while the chassis is covered by Kenworth Warranty, refer to Kenworth Warranty bulletin Wire Harness Warranty and Claim Filing
Requirements C-C-065 for claim filing instructions.
For visual defects and repairs, provide photos clearly showing the defect and the repair with your warranty claim. Providing the photos

https://eportal.paccar.com/dealer/uskw/en/service/vehiclebulletins/vehiclefieldservice/Page... 3/31/2020

TIB 34-085 - ABS Wheel Speed Sensor Corrosion

Page 2 of 3

greatly expedites the claim processing.
0.8 hours of labor to inspect all wheel speed sensors and connectors, and reseat the connector seals if necessary (SRT 013-199).
0.4 hours to R&R each front wheel speed sensor if corrosion is found on the sensor (SRT 013-200).
0.7 hours to R&R each rear wheel speed sensor if corrosion is found on the sensor (SRT 013-203).
3.7 hours of labor, which includes 0.8 hours for inspection, to remove and replace the ABS harness if corrosion is found on the
connector (SRT 013-212).
If multiple sensors are to be replaced, a picture for each sensor is required.
File a long claim form referencing 34-085.
Take-Off Parts Disposition: Destroy take-off parts after claim is paid
CLAIM CODING
Failure Location:

013-011-002

Work Accomplished:

Failure Type:

145

Responsibility Code:

SRT Code:

SRT 013-199
Claim Type:
0.8 hours
To inspect the
seals on the wheel
speed sensor
connector, and
reseat the seals if
necessary.
SRT 013-200
0.4 hours
To R&R each front
wheel speed
sensor. Includes
completing
diagnostic
checklist, attach to
packing tag, and
adjustment.
SRT 013-203
0.7 hour
To R&R each rear
wheel speed
sensor. Includes
adjustment.
SRT 013-212
2.9 hours
To remove and
replace ABS
Chassis Harness
as needed.
Includes wheel
speed sensor
inspection. For
MX-13 add SRT
032-050 for starter
R&R. For 6S/6M
ABS add 1.9
hours.

35
01
N/E

Parts
Parts are available from PACCAR Parts.
Quantity

Part Number

Description

1 as needed Varies – Refer to Web Ecat if
harness replacement is
necessary

ABS Harness

Up to 4 as
needed

Varies – Refer to Web Ecat if
Wheel Speed Sensor
replacement is necessary

Wheel Speed Sensor

As Needed

Source Locally

Cable Ties

As Needed

V46-1003-1750200

Nylon Abrasion Shield

https://eportal.paccar.com/dealer/uskw/en/service/vehiclebulletins/vehiclefieldservice/Page... 3/31/2020

TIB 34-085 - ABS Wheel Speed Sensor Corrosion

Page 3 of 3

Procedure
Follow the proper troubleshooting steps for any fault code as usual. If upon visual inspection the connectors are not properly installed, correctly
seat the seals if needed and check for corrosion.
1.
2.
3.
4.
5.

Consult the Inspection Procedure in the Attachments section to perform the wheel speed sensor inspection.
Properly seat any seals that are outside of the connector, as shown in the Inspection Procedure.
As stated in the Inspection Procedure, if any corrosion is present on the harness or wheel speed sensor, refer the attached Removal and
Replacement Procedure to replace the ABS harness. Refer to bulletin 34-081 for additional information on how to proceed if a harness is
corroded or damaged.
If corrosion is found on the Wheel Speed Sensor side of the connection, refer to the Bendix SD-13-4860 Wheel Speed Sensor Service Data
manual for replacement.
If corrosion is found, provide photos clearly showing the corrosion; refer to Kenworth Warranty bulletin Wire Harness Warranty and
Claim Filing Requirements C-C-065 for details.

Attachments
Inspection Procedure
Replacement Procedure
SD-13-4860 Wheel Speed Sensor Service Data

Authored by: OF

Access to PACCAR’s Enterprise Portal is provided as a benefit of doing business with PACCAR. All applications and content accessed through this
system are confidential and proprietary and the property of PACCAR Inc and its suppliers, and must be kept strictly confidential pursuant to the
contract licensing such access. Disclosure, publication, release or distribution of any material found on PACCAR systems to any person other
than employees with a need to know such information is strictly prohibited. All activity on this system is monitored. If PACCAR suspects or
discovers any unauthorized activity, access may be immediately terminated without prior notification. Violators may be subject to legal action.

© Copyright 2020 PACCAR Inc. All rights reserved. We welcome your feedback on this page. For technical questions or concerns about this
page, please contact the DealerNet Webmaster.

https://eportal.paccar.com/dealer/uskw/en/service/vehiclebulletins/vehiclefieldservice/Page... 3/31/2020