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Possible Causes



CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector
  1. AB1: CHECK FOR ABS MODULE DTCS 
  2. AB2: CHECK THE TIRES SIZE AND PRESSURE 
    • Ignition OFF.
    • Verify all the tires and wheels are the same size and the tire size and inflation pressures are correct as indicated on the VC label.
    • Are the tires and wheels OK? 
      Yes No
      Go to  AB3. INSTALL the correct size tire or wheel or ADJUST tire pressure as necessary.
      DRIVE the vehicle at a speed greater than 20 km/h (12 mph) to clear the ABS module wheel speed sensor DTCs.
  3. AB3: CHECK THE WHEEL SPEED SENSOR MOUNTING 
    • With the transmission in NEUTRAL, position the vehicle on a hoist. Refer to the Jacking and Lifting article.
    • Inspect the wheel speed sensor for correct installation and the fastener for looseness.
    • Is the wheel speed sensor installed correctly and the fastener tightened to specifications? 
      Yes No
      Go to  AB5. REINSTALL the wheel speed sensor and tighten the fastener to specifications. REFER to the appropriate procedure in the Anti-Lock Brake System (ABS) and Stability Control article.
      Go to  AB4.
  4. AB4: CHECK THE WHEEL SPEED SENSOR INPUTS 
    • Ignition ON, engine OFF.
    • Access the ABS and monitor the LF_WSPD (SPD) PID.
    • Access the ABS and monitor the RF_WSPD (SPD) PID.
    • Access the ABS and monitor the LR_WSPD (SPD) PID.
    • Access the ABS and monitor the RR_WSPD (SPD) PID.
    • Drive the vehicle at a speed greater than 20 km/h (12 mph) while monitoring the PIDs.
    • Are the wheel speed PIDs within 5 km/h (3 mph) of each other and the vehicle speed as indicated on the speedometer? 
      Yes No
      The system is operating correctly at this time. The concern may have been caused by a loose or incorrectly installed wheel speed sensor.
      DRIVE the vehicle at a speed greater than 20 km/h (12 mph) to clear the ABS module wheel speed sensor DTCs.      		 Go to  AB5.
  5. AB5: CHECK THE WHEEL SPEED SENSOR FOR DAMAGE 
    • Ignition OFF.
    • With the transmission in NEUTRAL, position the vehicle on a hoist. Refer to the Jacking and Lifting article.
    • Disconnect the suspect wheel speed sensor electrical connector.
    • Inspect the wheel speed sensor and harness for abrasions, broken connector tabs or water intrusion.
    • Are the wheel speed sensor and harness OK? 
      Yes No
      Go to  AB6. INSTALL a new WSS.
      REFER to the Anti-Lock Brake System (ABS) and Stability Control article.
      DRIVE the vehicle at a speed greater than 20 km/h (12 mph) to clear the ABS module wheel speed sensor DTCs.
  6. AB6: CHECK WHEEL BEARING AND ENCODER FOR DAMAGE 
    • Ignition OFF.
    • With the transmission in NEUTRAL, position the vehicle on a hoist. Refer to the Jacking and Lifting article.
    • Inspect the wheel bearings for abnormal wear or roughness and for deformation or contamination of the seal and encoder.
    • Are the wheel bearing and encoder OK? 
      Yes No
      Go to  AB8. INSTALL a new wheel bearing as necessary. REFER to the appropriate Service Information. DRIVE the vehicle at a speed greater than 20 km/h (12 mph) to clear the ABS module wheel speed sensor DTCs.
  7. AB7: CHECK THE WHEEL SPEED SENSOR PIDS 
    • Ignition ON, engine OFF.
    • Access the ABS and monitor the LF_WSPD (SPD) PID.
    • Access the ABS and monitor the RF_WSPD (SPD) PID.
    • Access the ABS and monitor the LR_WSPD (SPD) PID.
    • Access the ABS and monitor the RR_WSPD (SPD) PID.
    • Drive the vehicle at a speed greater than 48 km/h (30 mph) while monitoring the PIDs.
    • Are the wheel speed PIDs within 5 km/h (3 mph) of each other and the vehicle speed as indicated on the speedometer? 
      Yes No
      Go to  AB8. CLEAN the space between the wheel speed sensor encoder ring and the wheel speed sensor. INSPECT the air gap. INSTALL a new wheel bearing or wheel speed sensor as necessary. REFER to the Front Suspension, Rear Suspension or the Anti-Lock Brake System (ABS) and Stability Control articles. DRIVE the vehicle at a speed greater than 20 km/h (12 mph) to clear the ABS module wheel speed sensor DTCs.
  8. AB8: CHECK FOR CORRECT ABS MODULE OUTPUT 
  9. AB9: VERIFY ALL WIRING CONNECTIONS 
  10. AB10: CHECK FOR APPLICABLE SERVICE ARTICLES 
    • Check OASIS for any service articles: TSB, GSB, SSM or FSA.
    • Do any applicable service articles exist? 
  11. AB11: CHECK FOR CORRECT ABS MODULE OPERATION 
    • Connect the suspect wheel speed sensor. Make sure it seats and latches correctly.
    • ABS Module connector connected. (C155) Make sure the connector seats and latches correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
      Yes No
      INSTALL a new ABS module.
      INSTALL a new ABS module. REFER to the Anti-Lock Brake System (ABS) and Stability Control article.
      ORDER a replacement ABS module and INCLUDE the RVC on the form.
      If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.
      DRIVE the vehicle at a speed greater than 20 km/h (12 mph) to clear the ABS module wheel speed sensor DTCs.      		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
      DRIVE the vehicle at a speed greater than 20 km/h (12 mph) to clear the ABS module wheel speed sensor DTCs.
  12. AB12: CHECK FOR CORRECT ABS OPERATION 
    • Connect the suspect wheel speed sensor. Make sure it seats and latches correctly.
    • ABS_A Module connector connected. (C135A) Make sure the connector seats and latches correctly.
    • ABS_B Module connector connected. (C135B) Make sure the connector seats and latches correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
      Yes No
      INSTALL a new EBB assembly.
      The HCU and ABS module are a single unit known as the EBB assembly.
      INSTALL a new EBB assembly (HCU and ABS module). REFER to the Anti-Lock Brake System (ABS) and Stability Control article.
      ORDER a replacement EBB assembly and INCLUDE the RVC form.
      If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.
      DRIVE the vehicle at a speed greater than 20 km/h (12 mph) to clear the ABS module wheel speed sensor DTCs.      		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
      DRIVE the vehicle at a speed greater than 20 km/h (12 mph) to clear the ABS module wheel speed sensor DTCs.
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