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Home >> Audi >> 2010 >> A4 2.0T >> Repair and Diagnosis >> External Pages >> Different car >> Section 686 (Anti-Lock Brake System (Abs) And Stability Control) >> Diagnosis And Testing >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test Q : DTC U0151, U0452 >> Pinpoint Test Q : DTC U0151, U0452

Pinpoint Test Q : DTC U0151, U0452

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
  1. WARNING: Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the Safety Canopy and cause serious personal injury or death.
  2. WARNING: Never probe the electrical connectors on airbag, Safety Canopy or side air curtain assemblies. Failure to follow this instruction may result in the accidental deployment of these assemblies, which increases the risk of serious personal injury or death.
  3. WARNING: Never disassemble or tamper with seatbelt deployable components, including pretensioners, load limiters and inflators. Never back probe deployable device electrical connectors. Tampering or back probing may cause an accidental deployment and result in personal injury or death.
  4. NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  5. NOTE: Supplemental Restraint System(SRS) components should only be disconnected or reconnected when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS. 
  6. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

  7. Q1 CHECK THE COMMUNICATION NETWORK

    • Ignition ON.
    • NOTE: The Network Test does not test the private HS-CAN between the ABS module and the RCM.

      Using a diagnostic scan tool, carry out a Network Test.

    Does the RCM pass the Network Test? 

    Yes  GO to  Q2.
    No  DIAGNOSE the no communication with the RCM concern. REFER to Diagnosis and Testing in Module Communications Network .

  8. Q2 RECHECK THE ABS MODULE DTCs

    • Using a diagnostic scan tool, carry out the ABS module self-test.
    • Using a diagnostic scan tool, clear the ABS module DTCs.
    • Ignition OFF.
    • Ignition ON.
    • Using a diagnostic scan tool, carry out the ABS module self-test.
    • Record all ABS module DTCs.

    Is DTC U0151 or U0452 retrieved again? 

    Yes  GO to  Q3.
    No  If no DTCs are retrieved again, the system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  9. Q3 REVIEW THE RECORDED ABS MODULEDTCs

    • Review the previously recorded ABS module DTCs.

    Was DTC B1676 recorded? 

    Yes  GO to Pinpoint Test A .
    No  GO to  Q4.

  10. Q4 CHECK THE RCM FOR DTCs

    • Using a diagnostic scan tool, carry out the RCM self-test.

    Are there any DTCs in the RCM ? 

    Yes  DIAGNOSE the RCM DTCs, REFER to Supplemental Restraint System .
    No  GO to  Q5.

  11. Q5 CHECK FOR DTC U0151:XX OR U0452:XX SET IN OTHER MODULES

    • Using a diagnostic scan tool, carry out the self-test for all modules.

    Is DTC U0151:xx or U0452:xx set in 1 or more modules in addition to the ABS module? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, DIAGNOSE the RCM concern. Supplemental Restraint System .
    No  GO to  Q6.

  12. Q6 CHECK THE PRIVATE HS-CAN CIRCUITS FOR A SHORT TO VOLTAGE

    WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

    • Ignition OFF.
    • Wait one minute then disconnect RCM C310A and C310B .
    • Disconnect ABS module C135 .
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C135-24
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C135-37
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit. SET the ignition to OFF, WAIT 1 minute, CONNECT RCM C310A and C310B , CONNECT ABS module C135 , CLEAR any RCM DTCs.
    No  GO to  Q7.

  13. Q7 CHECK THE PRIVATE HS-CAN CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C135-24
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C135-37
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  Q8.
    No  REPAIR the circuit. SET the ignition to OFF, WAIT 1 minute, CONNECT RCM C310A and C310B , CONNECT ABS module C135 , CLEAR any RCM DTCs.

  14. Q8 CHECK THE PRIVATE HS-CAN CIRCUITS FOR A SHORT TOGETHER

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C135-24
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C135-37

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  Q9.
    No  REPAIR the circuit. SET the ignition to OFF, WAIT 1 minute, CONNECT RCM C310A and C310B , CONNECT ABS module C135 , CLEAR any RCM DTCs.

  15. Q9 CHECK THE PRIVATE HS-CAN CIRCUITS FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C135-24
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C310B-59
      C135-37
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C310B-60

    Are the resistances less than 3 ohms? 

    Yes  GO to  Q10.
    No  REPAIR the circuit. SET the ignition to OFF, WAIT 1 minute, CONNECT RCM C310A and C310B , CONNECT ABS module C135 , CLEAR any RCM DTCs.

  16. Q10 CHECK FOR CORRECT RCM OPERATION

    • Ignition OFF.
    • Disconnect all ABS module and RCM related in-line electrical connectors.
    • Inspect the RCM, ABS module and related in-line electrical connectors and wire harnesses for:
      • corrosion
      • loose or spread terminals
      • loose or frayed wire connections at terminals
      • pushed-out or bent pins
      • pinched, cut or pierced wires
    • Connect ABS module C135 and related in-line electrical connectors. Make sure they seat and latch correctly.
    • Connect RCM C310A and C310B . Make sure they seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, DIAGNOSE the RCM concern. REFER to Diagnosis and Testing in Supplemental Restraint System .
    No  The system is operating correctly at this time. The concern may have been caused by a wiring harness or electrical connector issue. ADDRESS the root cause of any wire harness or connector issues.
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