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Title: General Wheel Speed Sensor Troubleshooting

Applies To: Bendix and Wabco Wheel Speed Sensors

CHANGE LOG

Please refer to the change log text box below for recent changes to this article:

Document

1D: 10400040

Revision: 7
Created: 9/19/2007

Last

Modifiea: 7/19/2021

David

Author: Horner

Not Helpful

741

104/05/2018 - Author updated for feedback purposes
105/04/2015 - Revised iKnow to new format
t

DESCRIPTION

This document will guide the user through general abs wheel speed sensor diagnostics.

For specific manufactures wheel speed sensor diagnostics please refer to the resources section in this article.

SYMPTOM(s),
ABS light illuminated

Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):

DTC/Light Description

ABS LIGHT Wheel speed sensor fault

Customer Observations or Concerns:
ABS light illuminated

SPECIAL TOOL(s) / SOFTWARE

[Tool Description [Tool Number |Comments | Instructions

ABS Software Specific ABS system Make certain ABS diagnostic software
software is up to date

SERVICE PARTS INFORMATION

a ange \Quantity
Kit Description Part Number Required Notes
\J1939 cable 13519281C2 1 if needed
DIAGNOSTIC STEP(s)
Step/Action Decision
DIAGNOSTIC: Yes.

Proceed to step 2
Inspect and test wiring to the wheel speed sensor. With the sensor disconnected

from the harness and chassis harness unplugged from the ECU check each sensor No.
wire in the chassis harness for continuity using a suitable volt(ohm meter. Identify and repair open or

shorted circuit.
Does each wire end to end read less than < 5 ohms?

Note: This test is performed to check the chassis harness for any wiring

#1 |issues.
Chassis Harness
ABS Module R500 Wheel Speed Sensor
&
R100k ohms.

Repair short to ground in chassis
harness.

#2

Step

Action

Decision

DIAGNOSTIC:

Inspect the wheel ends for excessive play.

Use a dial indicator to verify acceptable endplay of 0.001" to 0.005".

Yes.

Adjust the wheel bearings as required
jto eliminate excessive wheel end
movement.

#3 No.
fa & Proceed to step 4
DIAL
INDICATOR
\)
3 aN ~ 4
ls there excessive wheel end play?
Step/Action Decision
DIAGNOSTIC: Yes.
Replace the tone ring.
\Check the tone ring and make sure there is not excessive corrosion.
Is there excessive corrosion?
4
No.
Proceed to step 5
Step|Action Decision
DIAGNOSTIC: Yes.
Make sure the sensor is held firmly in the holder and pushed all the way
lagainst the tone ring. Proceed to step 6
#5 No.
ls the sensor held in firmly?
Inspect sensor holder and replace
lsensor sleeve.
Step/Action Decision
#6 |DIAGNOSTIC: Yes.

chassis harness (you will be checking AC voltage at the ABS module sensor

least 4 revolution per second. Using an AC voltage meter, measure the voltage
ithe ABS module across the sensor terminals.

ls the output voltage greater than 0.25 Volt AC?

Park the vehicle on a hard, flat surface, turn the engine off, set the parking brake,
land block the wheels to prevent the vehicle from moving in either direction. Raise
the wheel from the suspect wheel speed.Reconnect the wheel speed sensor to the

terminals). Release the parking brakes. By hand, rotate the wheel at a rate of at

Proceed to step 7

No.

If output voltage is less than 0.25
at volt AC
Reposition sensor by gently
pushing it closer toward the wheel
until it touches the exciter ring.
Repeat the voltage measurement.
If still not OK, replace sensor.

NOTE:

If when you switch the wires at the ECU and the fault changes sides and you
can't find anything wrong with the wiring, you need to overlay the wires all the
|way from the ECU to the sensor eliminating as many connectors as possible.

[You can use 1939 datalink wire part number 3519281C2.

ABS Module Chassis Harness Wheel Speed Sensor
Step|Action if Decision

DIAGNOSTIC: — «> 280m @0sees Yes,

Re-test. If the code logs again, temporarily switch the left and right side sensor

wiring at the ECU. Re-test for codes. If the sensor fault code now logs as the __|This indicates a problem still in the

lopposite wheel end check the wiring between the ECU and the wheel sensor. Iflwiring harness or the specific wheel

ithe fault still logs as the same wheel end contact Tech Service as the ECU may|iend.

need to be replaced.
Please recheck chassis harness for

Did the fault log as the opposite wheel end? wiring issues.
Please recheck wheel end for
lexcessive play or damaged
components.
No.

#7

If the fault still logs as the same wheel
lend contact Tech Service as the ECU
may need to be replaced.

REPAIR STEP(s)

Please reference master service information for specific wheel speed sensor replacement information.

WARRANTY INFORMATION

Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.

Standard Repair Time(s):
Refer to the SRT Manual for Repair Times

OTHER RESOURCES

Master Service Information Site

1K0400080 Bendix Diagnostic Guides