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Visual Inspection and Diagnostic Pre-checks

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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 Module Connector (C135)
GFDW79032Courtesy of FORD MOTOR COMPANY
CIRCUIT AND PIN DESCRIPTION

Circuit Pin
Motor B+ (Battery Voltage HCU Motor) - SBB87 1 (GREEN/WHITE)
GND (Ground) - GD121 14 (BLACK/YELLOW)
  1. H1: CHECK THE VEHICLE BATTERY AND CHARGING SYSTEM 
    • Verify the vehicle battery and charging system are operating correctly. Refer to Inspection and Verification in Charging System article Diagnosis and Testing.
    • Are the battery and charging system operating correctly? 
      Yes No
      Go to  H2. FOLLOW the diagnostic repair directions as instructed in Charging System article, Diagnosis and Testing.
  2. H2: VERIFY ALL WIRING CONNECTIONS 
    • Ignition OFF.
      NOTE: The battery must be removed to access the ABS module electrical connector.
    • Remove the battery. Refer to the appropriate procedure in Battery, Mounting and Cables article
    • 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
    • Using a suitable mating terminal, check each connector terminal for deformed or enlarged contacts by comparing the mating terminal's fit between each of the following pins:
      • C135-1
      • C135-14
    • Is connector free of terminal corrosion, pushed-out terminals and spread terminals? 
      Yes No
      Go to  H3. REPAIR the affected terminal. Refer to Connector Repair Procedures article, for schematic and connector information.
  3. H3: CHECK PUMP MOTOR OPERATION 
    • Install the battery. Refer to the appropriate procedure in Battery, Mounting and Cables article
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Ignition ON, engine OFF.
    • Access the ABS and control the PMP_MTR (MODE) PID.
    • Command the pump motor on and listen for the ABS pump motor to activate.
    • Does the ABS pump motor run for approximately 2 seconds when commanded on? 
      Yes No
      Go to  H4. Go to  H5.
  4. H4: CHECK FOR FAULT REPEATABILITY 
    • Clear the ABS DTCs.
    • Ignition OFF.
    • Ignition ON, engine OFF.
    • Test drive the vehicle at speeds greater than 20 km/h (12 mph).
    • Ignition OFF.
    • Ignition ON, engine OFF.
    • Carry out the ABS self-test.
    • Is DTC C0020:71 or C1B02:71 present? 
      Yes No
      Go to  H7. For all other C0020:xx and C1B02:xx DTCs, Go to  H5.
      For all other DTCs, No fault found.
      Go to the ABS Module DTC Chart .
      If there are no DTCs present, No fault found.
      the system is operating correctly at this time.
      DISCONNECT and INSPECT the ABS module electrical connector. CLEAN or REPAIR the connector as necessary. ADDRESS the root cause of any connector or pin issues.
  5. H5: CHECK THE PUMP MOTOR VOLTAGE SUPPLY TO THE ABS MODULE 
    • Ignition OFF.
      NOTE: VERIFY BJB fuse 87 (60A) is OK. If not OK, REFER to the OEM Wiring Diagrams article to identify the possible causes of the circuit short.
      NOTE: The battery must be removed to access the ABS module electrical connector.
    • Remove the battery. Refer to the appropriate procedure in Battery, Mounting and Cables article
    • Disconnect the ABS module electrical connector.
    • Install the battery. Refer to the appropriate procedure in Battery, Mounting and Cables article
    • Measure the voltage between:
      (+) ABS Module (C135) Connector, Harness Side (-)
      Motor B+ - SBB87 (GREEN/WHITE) - Pin 1 Ground
    • Is the voltage greater than 11 volts? 
      Yes No
      Go to  H6. REPAIR the circuit.
  6. H6: CHECK THE ABS MODULE GROUND CIRCUIT FOR AN OPEN 
    • Disconnect the battery negative cable. Refer to the General Procedure in Battery, Mounting and Cables article
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-)
      GND - GD121 (BLACK/YELLOW) - Pin 14 Ground
    • Is the resistance less than 3 ohms? 
      Yes No
      Go to  H7. REPAIR the circuit.
  7. H7: VERIFY ALL WIRING CONNECTIONS 
    NOTE: The battery must be removed to access the ABS module electrical connector.
    • Remove the battery. Refer to the appropriate procedure in Battery, Mounting and Cables article.
    • 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  H10. REPAIR the connector or terminals. Refer to Connector Repair Procedures article, for schematic and connector information.
  8. H8: CHECK FOR CORRECT HCU OPERATION 
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Connect the battery negative cable. Refer to the General Procedure in Battery, Mounting and Cables article.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
      Yes No
      INSTALL a new HCU.
      CHECK OASIS for any 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 HCU. REFER to Anti-Lock Brake System (ABS) and Stability Control article.
      ORDER a replacement HCU and INCLUDE the RVC on the form.
      If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.      		 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.
  9. H9: CHECK FOR CORRECT ABS MODULE AND HCU OPERATION 
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Connect the battery negative cable. Refer to the General Procedure in Battery, Mounting and Cables article
    • 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 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 HCU and ABS module assembly. REFER to Anti-Lock Brake System (ABS) and Stability Control article
      ORDER a replacement ABS module and HCU assembly and INCLUDE the RVC on the form.
      If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.      		 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.
  10. H10: CHECK FOR CORRECT ABS MODULE OPERATION 
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Install the battery. Refer to the appropriate procedure in Battery, Mounting and Cables article
    • Connect the battery negative cable. Refer to the General Procedure in Battery, Mounting and Cables article
    • 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 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. REFER to 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.      		 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.
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