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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1152 (Anti-Lock Brake System Component Testing) >> Pinpoint Tests >> Pinpoint Tests NA: Rear Wheel Speed Sensor Electrical Faults >> Visual Inspection and Diagnostic Pre-checks

Visual Inspection and Diagnostic Pre-checks

WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
Fig 1: Antilock Braking System (ABS) Module Connector - C135
G11915981Courtesy of FORD MOTOR CO.
CONNECTOR PIN REFERENCE (HARNESS SIDE)

Circuit Pin
LR WSS LO (Left Rear Wheel Speed Sensor Low) - RCA18 6 (BROWN/GREEN)
LR WSS HI (Left Rear Wheel Speed Sensor High) - VCA04 7 (BLUE/ORANGE)
RR WSS LO (Right Rear Wheel Speed Sensor Low) - RCA20 10 (BROWN)
RR WSS HI (Right Rear Wheel Speed Sensor High) - VCA06 11 (WHITE/ORANGE)
Fig 2: Left Rear Wheel Speed Sensor Connector - C440
G11915982Courtesy of FORD MOTOR CO.
CONNECTOR PIN REFERENCE (HARNESS SIDE)

Circuit Pin
LR WSS LO (Left Rear Wheel Speed Sensor Low) - RCA18 2 (BROWN/GREEN)
LR WSS HI (Left Rear Wheel Speed Sensor High) - VCA04 1 (BLUE/ORANGE)
Fig 3: Right Rear Wheel Speed Sensor Connector - C426
G11915983Courtesy of FORD MOTOR CO.
CONNECTOR PIN REFERENCE (HARNESS SIDE)

Circuit Pin
RR WSS LO (Right Rear Wheel Speed Sensor Low) - RCA20 2 (BROWN)
RR WSS HI (Right Rear Wheel Speed Sensor High) - VCA06 1 (WHITE/ORANGE)
  1. NA1: CHECK FOR FAULT REPEATABILITY 
    • Ignition ON, engine OFF.
    • Clear the ABS DTCs.
    • Ignition OFF.
    • Ignition ON, engine OFF.
    • Test drive the vehicle above 20 km/h (12 mph).
    • Bring the vehicle to a safe stop.
    • Carry out the ABS self-test.
    • Is one or more of the DTCs shown in the ABS DTC Fault Trigger Conditions table present? 
      Yes No
      Go to  NA2. The system is operating correctly at this time. INSPECT both front wheel speed sensor electrical connectors and the ABS module electrical connector. REPAIR or CLEAN the connector as necessary. ADDRESS the root cause of any connector or pin issues.
  2. NA2: CHECK THE VEHICLE FOR THE ACTIVE PARK ASSIST FEATURE 
    • Check the vehicle for the active park assist feature.
    • Is the vehicle equipped with the active park assist feature? 
      Yes No
      If DTC C0037:15 or C003A:15 is present, Go to  NA7.
      If DTC C0037:11 or C003A:11 is present, Go to  NA9.      		 Go to  NA3.
  3. NA3: CHECK IF A ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER IS AVAILABLE 
    • Check if the Rotunda Active Wheel Speed Sensor Tester is available.
    • Is the Rotunda Active Wheel Speed Sensor Tester available? 
      Yes No
      Go to  NA4. If DTC C0037:15 or C003A:15 is present, Go to  NA7.
      If DTC C0037:11 or C003A:11 is present, Go to  NA9.
  4. NA4: CHECK THE ABS MODULE OUTPUT USING THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER 
    • Ignition OFF.
    • Disconnect the suspect wheel speed sensor connector.
    • Connect the Rotunda Active Wheel Speed Sensor Tester to the suspect wheel speed sensor connector.
    • Ignition ON, engine OFF.
    • Select the correct system polarity on the Rotunda Active Wheel Speed Sensor Tester and turn the power switch to the ON position.
    • Is the tester output LED illuminated? 
      Yes No
      Go to  NA5. Go to  NA7.
  5. NA5: CHECK THE WHEEL SPEED SENSOR FOR A SHORT TO VOLTAGE WITH THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER 
    • Observe the current overload LED on the Rotunda Active Wheel Speed Sensor Tester.
    • Is the current overload LED illuminated? 
      Yes No
      REPAIR the suspect wheel speed sensor circuit for a short to voltage. Go to  NA6.
  6. NA6: CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER 
    • Raise the vehicle until the suspect wheel can spin freely. Refer to Jacking & Lifting .
    • While monitoring the Rotunda Active Wheel Speed Sensor Tester, slowly spin the suspect wheel.
    • Do the sensor output Light-emitting Diodes (LEDs) illuminate and flash? 
      Yes No
      The system is operating correctly at this time. INSPECT all wheel speed sensor electrical connectors and the ABS module electrical connectors. REPAIR or CLEAN the connector as necessary. ADDRESS the root cause of any connector or pin issues. INSTALL a new wheel speed sensor for the one in question. REFER to Anti-Lock Brake System (ABS) And Stability Control .
  7. NA7: CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO BATTERY VOLTAGE 
    • Ignition OFF.
      NOTE: The battery must be removed to access the ABS module electrical connector.
    • Remove the battery. Refer to Charging System (Battery, Battery Mounting And Battery Cables .
    • ABS Module connector disconnected. (C135)
    • Disconnect the suspect wheel speed sensor.
    • Install the battery. Refer to Charging System (Battery, Battery Mounting And Battery Cables .
    • Ignition ON, engine OFF.
    • For the left rear wheel speed sensor:
    • Measure the voltage between:
      (+) Left Rear Wheel Speed Sensor (C440) Connector, Harness Side (-)
      LR WSS LO - RCA18 (BROWN/GREEN) - Pin 2 Ground
      LR WSS HI - VCA04 (BLUE/ORANGE) - Pin 1 Ground
    • For the right rear wheel speed sensor:
    • Measure the voltage between:
      (+) Right Rear Wheel Speed Sensor (C426) Connector, Harness Side (-)
      RR WSS LO - RCA20 (BROWN) - Pin 2 Ground
      RR WSS HI - VCA06 (WHITE/ORANGE) - Pin 1 Ground
    • Is any voltage present? 
      Yes No
      REPAIR the circuit in question. Go to  NA8.
  8. NA8: CHECK THE WHEEL SPEED CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • For the left rear wheel speed sensor:
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-) Left Rear Wheel Speed Sensor (C440) Connector, Harness Side
      LR WSS LO - RCA18 (BROWN/GREEN) - Pin 6 LR WSS LO - RCA18 - Pin 2
      LR WSS HI - VCA04 (BLUE/ORANGE) - Pin 7 LR WSS HI - VCA04 - Pin 1
    • For the right rear wheel speed sensor:
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-) Right Rear Wheel Speed Sensor (C426) Connector, Harness Side
      RR WSS LO - RCA20 (BROWN) - Pin 10 RR WSS LO - RCA20 - Pin 2
      RR WSS HI - VCA06 (WHITE/ORANGE) - Pin 11 RR WSS HI - VCA06 - Pin 1
    • Are the resistances less than 3 ohms? 
      Yes No
      Go to  NA9. REPAIR the circuit in question.
  9. NA9: CHECK FOR SHORTED WHEEL SPEED SENSOR CIRCUITS 
    • Ignition OFF.
      NOTE: The battery must be removed to access the ABS module electrical connector.
    • Remove the battery if the ABS module has not been previously disconnected. Refer to Charging System (Battery, Battery Mounting And Battery Cables .
    • ABS Module connector disconnected. (C135) (if not previously disconnected)
    • Disconnect the suspect wheel speed sensor (if not previously disconnected).
    • For the left rear wheel speed sensor:
    • Measure the resistance between:
      (+) Left Rear Wheel Speed Sensor (C440) Connector, Harness Side (-) Left Rear Wheel Speed Sensor (C440) Connector, Harness Side
      LR WSS HI - VCA04 (BLUE/ORANGE) - Pin 1 LR WSS LO - RCA18 - Pin 2
    • For the right rear wheel speed sensor:
    • Measure the resistance between:
      (+) Right Rear Wheel Speed Sensor (C426) Connector, Harness Side (-) Right Rear Wheel Speed Sensor (C426) Connector, Harness Side
      RR WSS HI - VCA06 (WHITE/ORANGE) - Pin 1 RR WSS LO - RCA20 - Pin 2
    • Is the resistance greater 10, 000 ohms? 
      Yes No
      Go to  NA10. REPAIR the circuits.
  10. NA10: CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO GROUND 
    • For the left rear wheel speed sensor:
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-)
      LR WSS LO - RCA18 (BROWN/GREEN) - Pin 6 Ground
      LR WSS HI - VCA04 (BLUE/ORANGE) - Pin 7 Ground
    • For the right rear wheel speed sensor:
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-)
      RR WSS LO - RCA20 (BROWN) - Pin 10 Ground
      RR WSS HI - VCA06 (WHITE/ORANGE) - Pin 11 Ground
    • Are the resistances greater than 10, 000 ohms? 
      Yes No
      Go to  NA11. REPAIR the circuit in question.
  11. NA11: CHECK THE ABS MODULE OUTPUT 
    NOTE: The ABS module disables the voltage output immediately if the wheel speed sensor is not present. Make sure all test connections are made at the wheel speed sensor before the ignition is set to ON.
    NOTE: Use a meter with a min-max feature or recording capabilities to obtain accurate measurements. The ABS module disables the voltage output immediately if the wheel speed sensor is not present.
    • ABS Module connector connected. (C135)
    • Install the battery. Refer to Charging System (Battery, Battery Mounting And Battery Cables .
    • Connect the meter to the suspect wheel speed sensor electrical connector, harness side.
    • Set the meter to measure DC voltage.
    • Set the meter range to greater than 15 volts.
    • Enable the min-max or recording feature on the meter.
    • Ignition ON, engine OFF.
    • For the left rear wheel speed sensor:
    • Measure the voltage between:
      (+) Left Rear Wheel Speed Sensor (C440) Connector, Harness Side (-) Left Rear Wheel Speed Sensor (C440) Connector, Harness Side
      LR WSS HI - VCA04 (BLUE/ORANGE) - Pin 1 LR WSS LO - RCA18 - Pin 2
    • For the right rear wheel speed sensor:
    • Measure the voltage between:
      (+) Right Rear Wheel Speed Sensor (C426) Connector, Harness Side (-) Right Rear Wheel Speed Sensor (C426) Connector, Harness Side
      RR WSS HI - VCA06 (WHITE/ORANGE) - Pin 1 RR WSS LO - RCA20 - Pin 2
    • Check the maximum recorded voltage on the meter.
    • Is the voltage greater 10 volts? 
      Yes No
      INSTALL a new wheel speed sensor for the one in question. REFER to Anti-Lock Brake System (ABS) And Stability Control . Go to  NA12.
  12. NA12: VERIFY ALL WIRING CONNECTIONS 
    • Ignition OFF.
      NOTE: The battery must be removed to access the ABS module electrical connector.
    • Remove the battery. Refer to Charging System (Battery, Battery Mounting And Battery Cables .
    • ABS Module connector disconnected. (C135)
    • 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  NA13. REPAIR the connector or terminals. Refer to OEM Connector Repair Procedures .
  13. NA13: CHECK FOR CORRECT ABS MODULE OPERATION 
    • Connect the suspect wheel speed sensor electrical connector. Make sure it seats and latches correctly.
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Install the battery. Refer to Charging System (Battery, Battery Mounting And Battery Cables .
    • 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 service articles: TSB, GSB, SSM or FSA.
      If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions.
      If no service actions 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.
  14. NA14: CHECK FOR CORRECT ABS OPERATION 
    • Connect the suspect wheel speed sensor electrical connector. Make sure it seats and latches correctly.
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Install the battery. Refer to Charging System (Battery, Battery Mounting And Battery Cables .
    • 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 service articles: TSB, GSB, SSM or FSA.
      If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions.
      If no service articles address this concern, INSTALL a new ABS module and HCU assembly. REFER to Anti-Lock Brake System (ABS) And Stability Control .
      ORDER a replacement ABS module and HCU assembly. 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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