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Home >> Ford >> 2015 >> Transit-350 HD Base, Van Cargo Extended >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System Component Testing >> Pinpoint Tests >> Pinpoint Tests B: Wheel Speed Sensor Erratic Signal Faults >> Possible Causes
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Possible Causes

Fig 1: Antilock Braking System (ABS) Module Connector - C135
G11680238Courtesy of FORD MOTOR CO.
CONNECTOR PIN REFERENCE (HARNESS SIDE)

Circuit Pin
LF WSS HI (Left Front Wheel Speed Sensor High) - VCA03 19 (VIOLET/WHITE)
LF WSS LO (Left Front Wheel Speed Sensor Low) - RCA17 8 (YELLOW)
RF WSS HI (Right Front Wheel Speed Sensor HI) - VCA05 16 (GRAY/VIOLET)
RF WSS LO (Right Front Wheel Speed Sensor Low) - RCA19 4 (VIOLET)
LR WSS HI (Left Rear Wheel Speed Sensor High) - VCA04 31 (BLUE/ORANGE)
LR WSS LO (Left Rear Wheel Speed Sensor Low) - RCA18 18 (BROWN/GREEN)
RR WSS HI (Right Rear Wheel Speed Sensor High) - VCA06 17 (WHITE/ORANGE)
RR WSS LO (Right Rear Wheel Speed Sensor Low) - RCA20 29 (BROWN)
Fig 2: Left Front Wheel Speed Sensor Connector - C150
G11680239Courtesy of FORD MOTOR CO.
CONNECTOR PIN REFERENCE (HARNESS SIDE)

Circuit Pin
LF WSS HI (Left Front Wheel Speed Sensor High) - VCA03 1 (BROWN)
LF WSS LO (Left Front Wheel Speed Sensor Low) - RCA17 2 (YELLOW)
Fig 3: Right Front Wheel Speed Sensor Connector - C160
G11680240Courtesy of FORD MOTOR CO.
CONNECTOR PIN REFERENCE (HARNESS SIDE)

Circuit Pin
RF WSS HI (Right Front Wheel Speed Sensor HI) - VCA05 1 (BROWN)
RF WSS LO (Right Front Wheel Speed Sensor Low) - RCA19 2 (YELLOW)
Fig 4: Left Rear Wheel Speed Sensor Connector - C440
G11680241Courtesy of FORD MOTOR CO.
CONNECTOR PIN REFERENCE (HARNESS SIDE)

Circuit Pin
LR WSS HI (Left Rear Wheel Speed Sensor High) - VCA04 1 (BROWN)
LR WSS LO (Left Rear Wheel Speed Sensor Low) - RCA18 2 (YELLOW)
Fig 5: Right Rear Wheel Speed Sensor Connector - C426
G11680242Courtesy of FORD MOTOR CO.
CONNECTOR PIN REFERENCE (HARNESS SIDE)

Circuit Pin
RR WSS HI (Right Rear Wheel Speed Sensor High) - VCA06 1 (BROWN)
RR WSS LO (Right Rear Wheel Speed Sensor Low) - RCA20 2 (YELLOW)

Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

  1. B1: CHECK FOR ABS MODULE DTCS 
    • Ignition ON, engine OFF.
    • Carry out the ABS self-test.
    • Is DTC C003x:01, C003x:11, C003x:12 or C003x:14 present? 
      Yes No
      For DTC C0031:01, C0031:11, C0031:12, C0031:14, C0032:11, C0034:01, C0034:11, C0034:12, C0034:14 or C0035:11, Go to PINPOINT TEST M .
      For DTC C0037:01, C0037:11, C0037:12, C0037:14, C0038:11, C003A:01, C003A:11, C003A:12, C003A:14 or C003B:11, Go to PINPOINT TEST N .      		 Go to  B2.
  2. B2: 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  B3. INSTALL the correct size tire or wheel or ADJUST tire pressure as necessary.
  3. B3: CHECK THE WHEEL SPEED SENSOR AND ELECTRICAL CONNECTOR 
    • With the transmission in NEUTRAL, position the vehicle on a hoist. Refer to JACKING & LIFTING .
    • Disconnect the suspect wheel speed sensor electrical connector.
    • Using a good light source, inspect the wheel speed sensor and electrical connector for the following:
      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary
      • water intrusion - clean and dry the connector, install a new connector as necessary
    • 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
      For F-150 front wheel speed sensors, Go to  B5.

      For F-150 rear wheel speed sensors, Go to  B4.


      For all others, Go to  B5.      		 INSTALL a new wheel speed sensor for the one in question. REFER to the appropriate procedure in ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL .
  4. B4: INSPECT THE WHEEL SPEED SENSOR MOUNTING 
    • Inspect the suspect rear wheel speed sensor and fastener for looseness.
    • Inspect the suspect rear wheel speed sensor installation.
    • Is the wheel speed sensor installed correctly and is the wheel speed sensor fastener tight? 
      Yes No
      Go to  B5. REINSTALL or TIGHTEN the wheel speed sensor fastener to specification.
  5. B5: CHECK THE FRONT WHEEL BEARINGS AND REAR ENCODERS FOR DAMAGE 
    • Inspect the suspect front wheel bearing for abnormal wear or roughness and for deformation or contamination of the seal and encoder.
    • Inspect the suspect rear wheel bearing for abnormal wear or roughness and for deformation or contamination of the seal and encoder.
    • Are the wheel bearings and encoders OK? 
      Yes No
      Go to  B7. For the front wheel hub, INSTALL a new wheel hub as necessary. REFER to the appropriate procedure in FRONT SUSPENSION SYSTEM .

      For the rear wheel hub, INSTALL a new wheel hub as necessary. REFER to the appropriate procedure in REAR SUSPENSION SYSTEM .


      For the rear encoder, INSTALL a new encoder as necessary. REFER to the appropriate procedure in REAR DRIVE AXLE/DIFFERENTIAL or WHEEL HUBS AND BEARINGS - FULL FLOATING AXLE .
  6. B6: CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • ABS Module connector disconnected. (C135)
    • Measure the circuits between the ABS module and the suspect wheel speed sensor.
    • Measure the resistance between:
      (+) (-)
      ABS Module (C135) Connector, Harness Side Left Front Wheel Speed Sensor Sensor (C150) Connector, Harness Side
      LF WSS HI - VCA03 (VIOLET/WHITE) - Pin 19 LF WSS HI - VCA03 - Pin 1
      LF WSS LO - RCA17 (YELLOW) - Pin 8 LF WSS LO - RCA17 - Pin 2
    • Measure the resistance between:
      (+) (-)
      ABS Module (C135) Connector, Harness Side Right Front Wheel Speed Sensor (C160) Connector, Harness Side
      RF WSS HI - VCA05 (GRAY/VIOLET) - Pin 16 RF WSS HI - VCA05 - Pin 1
      RF WSS LO - RCA19 (VIOLET) - Pin 4 RF WSS LO - RCA19 - Pin 2
    • Measure the resistance between:
      (+) (-)
      ABS Module (C135) Connector, Harness Side Left Rear Wheel Speed Sensor (C440) Connector, Harness Side
      LR WSS HI - VCA04 (BLUE/ORANGE) - Pin 31 LR WSS HI - VCA04 - Pin 1
      LR WSS LO - RCA18 (BROWN/GREEN) - Pin 18 LR WSS LO - RCA18 - Pin 2
    • Measure the resistance between:
      (+) (-)
      ABS Module (C135) Connector, Harness Side Right Rear Wheel Speed Sensor (C426) Connector, Harness Side
      RR WSS HI - VCA06 (WHITE/ORANGE) - Pin 17 RR WSS HI - VCA06 - Pin 1
      RR WSS LO - RCA20 (BROWN) - Pin 29 RR WSS LO - RCA20 - Pin 2
    • Is the resistance less than 3 ohms? 
      Yes No
      Go to  B7. REPAIR the open circuit.
  7. B7: CHECK FOR RETURNING DTCS 
    • ABS Module connector connected. (C135)
    • Connect the suspect wheel speed sensor electrical connector.
    • Ignition ON, engine OFF.
    • Clear the ABS DTCs.
    • Test drive the vehicle under normal driving conditions above 20 km/h (12 mph).
    • Carry out the ABS self-test.
    • Is one or more of the DTCs shown in the DTC Fault Trigger Conditions table present? 
      Yes No
      Go to  B8. 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.
  8. B8: VERIFY ALL WIRING CONNECTIONS 
    • Ignition OFF.
    • ABS Module connector disconnected. (C135)
    • Disconnect the suspect wheel speed sensor electrical connector.
    • Disconnect all in-line electrical connectors between the ABS module and the suspect wheel speed sensor.
    • Using a good light source, inspect all disconnected electrical connectors for the following:
      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary
    • Are the connectors free of corrosion, damaged pins, bent pins, pushed-out pins and spread terminals? 
      Yes No
      Go to  B9. REPAIR the affected connectors or terminals. REFER to OEM CONNECTOR REPAIR PROCEDURES for schematic and connector information.
  9. B9: CHECK FOR CORRECT ABS MODULE OPERATION 
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Connect the suspect wheel speed sensor electrical connector.
      • Make sure the connector seats and latches correctly.
    • Connect all in-line electrical connectors between the ABS module and the suspect wheel speed sensor.
      • Make sure the connectors seat and latch correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
      Yes No
      INSTALL a new ABS module.

      CHECK OASIS for any applicable Technical Service Bulletins TSBs.

      If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions.

      If no TSBs address this concern, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL .

      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.


      When complete, SELECT the "X" in the top right corner to CLOSE this procedure.      		 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.

      If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.


      When complete, SELECT the "X" in the top right corner to CLOSE this procedure.
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