BENDIX BW2453 User's Manual
Contents
1. above 7 revolution per second Measure voltage at sensor plug Re adjust sensor position to touch exciter ring Is the NO sensor is Did output voltage out of range you already 0 25 Volts AC or adjust sensor higher position YES technician already tried adjusting sensor position Replace sensor END TEST YES voltage is in range The sensor is OK Use ABS ECU Service Data troubleshooting guide to find another potential source of the problem END TEST 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 Use the new corresponding Bendix sensor service kit that contains the sensor and clamping sleeve Clear the trouble code using the ECU Service Data instructions Include this checklist when returning a sensor It will help expedite your claim Please fill out all applicable fields 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 t2. Bend Wheel Speed Sensor Checklist Bendix 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 find 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 check ao OK between 1200 and 2700 ohms one gt Not OK less than 1200 or more than 2700 ohms If not OK replace the sensor End test 3 Confirm that chocks are in place on vehicle Raise the wheel off the ground
3. he 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 lf 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 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 fittings etc must be of equivalent size type and strength as original equipment and be designed specifically for such applications and
4. systems 9 Components with stripped threads or damaged parts should be replaced rather than repaired Do not attempt repairs requiring machining or welding unless specifically 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 ATC 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 WS 24 AntiLock Wheel Speed Sensor SD 13 4860 BW2364 Bendix ABS Warranty Policy 2 a BW1922 ACom Diagnostics PC Software o oo ooa ee BW2329 Free downloads available on www bendix com ABS Repair and Diagnostics DVD 1 2 ee 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 BW2453 2008 Bendix Commercial Vehicle Systems LLC 8 08 All Rights Reser
5. 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 1 2 revolution per second Using an AC voltage meter measure the voltage at the ECU across the sensor terminals Q OK Output voltage is 0 25 Volt AC check Z minimum 0 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 BW2453 2008 Bendix Commercial Vehicle Systems LLC 8 08 All Rights Reserved Printed in USA tas START TEST Is the sensor or cable cut crimped or pinched YES damage is visible NO inspection finds no damage Ignition off chock wheels drain air from system Unplug sensor at ECU Measure resistance at sensor plug Is the resistance 1200 2700 Ohms YES resistance is in range NO sensor is out of range For wheel speed sensors with metal infinite resistance cases between case and otherwise skip this step NO sensor is out of range YES resistance is in range Raise the wheel and rotate at
6. ved Printed in USA
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