BENDIX BW2453 User Manual

Bendix® Wheel Speed Sensor Checklist

(See Document BW1922 for Full Bendix Warranty Policy)

Preparation CAUTION: Follow all standard safety precautions

- see back page. Park the vehicle, chock the wheels and drain air system. Turn the ignition off. Use ABS diagnostics to ﬁ nd the suspected sensor.

A. Inspect Physical Condition

Inspect the sensor cable for cuts, evidence of pinching or wear, abrasions with wiring exposed. If any of the above conditions are noted, replace the sensor, clear the trouble code according to the ECU Service Data directions. Re-check system before returning vehicle to service.

B. Test Resistance and Voltage

The vehicle must be at ambient temperature (0-100 degrees F, -18 to 38 degrees C) for an accurate reading, so be sure that the wheel end area is not hot. Based on the ABS ECU diagnostic code, disconnect the suspected sensor harness. At the extreme top of the temperature range, the sensor resistance can vary from 1200-2700 Ohms and still be within the operable range.

1. Inspect the connectors and terminals for corrosion, physical damage or loose connections. If possible, repair and/or clean the connectors.

2. Use a Volt-Ohm meter to measure resistance across the connector pins:



 OK - between 1200 and 2700 ohms.

check



one

 Not OK - less than 1200 or more

than 2700 ohms.

If not OK, replace the sensor. End test.

3. Conﬁ rm that chocks are in place on 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 voltage meter, measure the voltage at the ECU across the sensor terminals.

 OK - Output voltage is 0.25 Volt AC



minimum

check



one

 Not OK - Output voltage is less than

0.25 Volt AC.

If voltage is not OK, 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. End test.

6. If the Ohm and voltage readings are OK, the sensor itself is not the cause of the failure. 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.

1200-2700

* WHEN REPLACING A SENSOR UNDER WARRANTY

NOTE: DO NOT CUT THE SENSOR CABLE WHEN REMOVING THE SENSOR so that a proper analysis can be completed by Bendix Warranty Engineers. Cut or frayed cables are

ineligible for warranty.

A. Use the new corresponding Bendix sensor service kit that

contains the sensor and clamping sleeve.

B. Clear the trouble code using the ECU Service Data

instructions.

C. Include this checklist when returning a sensor. It will help

expedite your claim. Please ﬁ ll out all applicable ﬁ elds on this checklist and include: ECU Model ________________________

VIN # _________________________________________

SAFE MAINTENANCE PRACTICES When working on or around a vehicle, the following general precautions should be observed

at all times.

1. Park the vehicle on a level surface, apply the parking brakes, and always block the wheels. Always wear safety glasses.

2. Stop the engine and remove ignition key when working under or around the vehicle. When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically charged components.

3. Do not attempt to install, remove, disassemble or assemble a component until you have read and thoroughly understand the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools.

4. If the work is being performed on the vehicle’s air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. If the vehicle is equipped with an AD-IS

air dryer system or a dryer reservoir module, be sure to drain the purge reservoir.

5. Following the vehicle manufacturer’s recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle.

6. Never exceed manufacturer’s recommended pressures.

7. Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted.

8. Use only genuine Bendix® replacement parts, components and kits. Replacement hardware, tubing, hose, ﬁ ttings, etc. must be of equivalent size, type and strength as original equipment and be designed speciﬁ cally for such applications and systems.

9. Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or welding unless speciﬁ cally stated and approved by the vehicle and component manufacturer.

10. Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition.

11. For vehicles with Antilock Traction Control (ATC), the ATC function must be disabled (A TC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving.

___________________

Reference Documents: Service Data Sheet: Bendix

Bendix ABS Warranty Policy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BW1922

ACom™ Diagnostics PC Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BW2329

(Free downloads available on www.bendix.com)

ABS Repair and Diagnostics DVD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BW2538

Visit the Literature Center on www.bendix.com for free downloads of Service Data Sheets and Warranty Policies or to order copies. For more information, contact your local Bendix representative or the Bendix Technical Assistance Team at 1-800-AIR-BRAKE (1-800-247-2725), Monday through Friday , 8:00 A.M. to 6:00 P.M. EST, and follow the instructions in the recorded message. Or, you may e-mail the Bendix technical assistance team at: techteam@bendix.com.

WS-24™ AntiLock Wheel Speed Sensor . . . . . SD-13-4860 (BW2364)