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Pinpoint Test - DTC: AL U0100:87

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions 

The BECMB uses information contained in messages from the PCM sent on the HS-CAN1.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U0100:87 Lost Communication with ECM/PCM "A": Missing Message This DTC sets if the BECMB does not receive an expected message from the PCM.

Possible Causes 

PINPOINT TEST A : U0100:87 

  1. NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
  2. NOTE: Only disconnect or reconnect SRS components when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
  3. NOTE: Always make sure the correct SRS component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford parts catalog to make sure the correct component is being installed. If an incorrect SRS component is installed, Diagnostic Trouble Codes (DTCs) may set.

  4. A1 VERIFY DIAGNOSTIC SCAN TOOL COMMUNICATION WITH THE PCM (POWERTRAIN CONTROL MODULE)

    WARNING: Before beginning any service procedure in this information, refer to Safety Warnings in General Information. Failure to follow this instruction may result in serious personal injury.

    • Ignition ON.

    • Connect the diagnostic scan tool.

    • Check that a vehicle session can be established using the diagnostic scan tool.

    Can a vehicle session be established? 

    Yes  GO to  A2
    No  To diagnose no communication with the PCM, REFER to: Communications Network .

  5. A2 CHECK THE BECMB (BATTERY ENERGY CONTROL MODULE B) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CM DTCS)

    • Using a diagnostic scan tool, perform BECMB self-test.

    • Using a diagnostic scan tool, clear BECMB Diagnostic Trouble Codes (DTCs).

    • Wait 10 seconds.

    • Using a diagnostic scan tool, perform BECMB self-test.

    Is DTC U0100:87 retrieved again? 

    Yes  GO to  A3
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  6. A3 CHECK FOR THE CORRECT BECMB (BATTERY ENERGY CONTROL MODULE B)

    • Using the Log Viewer function of the diagnostic scan tool, retrieve and record the BECMB part number.

    • Check the recorded part number against the number listed in the Ford parts catalog.

    Does the recorded part number match the number listed in the Ford parts catalog? 

    Yes  GO to  A4
    No  INSTALL the correct BECMB and use As-Built data when carrying out PMI. REFER to: Battery Energy Control Module B (BECMB) . GO to  A6

  7. A4 VERIFY THE BECMB (BATTERY ENERGY CONTROL MODULE B) CONFIGURATION

    • Carry out PMI for the BECMB. Manually enter As-Built data. Refer to the diagnostic scan tool instructions when carrying out PMI.

    • Using a diagnostic scan tool, clear BECMB Diagnostic Trouble Codes (DTCs).

    • Wait 10 seconds.

    • Using a diagnostic scan tool, perform BECMB self-test.

    Is DTC U0100:87 retrieved again? 

    Yes  GO to  A5
    No  The system is operating correctly at this time. The DTC was caused by an incorrect RCM configuration. GO to  A6

  8. A5 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PCM (POWERTRAIN CONTROL MODULE) KOEO (KEY ON, ENGINE OFF) SELF-TEST

    • Using a diagnostic scan tool, perform PCM self-test.

    • Check for recorded Diagnostic Trouble Codes (DTCs) from the PCMKOEO self-test.

    Is DTC P0562 or P0563 recorded? 

    Yes  DIAGNOSE the PCM Diagnostic Trouble Codes (DTCs). Refer to the appropriate information in Engine System for the procedure.
    No  GO to  A6

  9. A6 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0100:00 SET IN MODULES OTHER THAN THE BECMB (BATTERY ENERGY CONTROL MODULE B)

    • Using a diagnostic scan tool, perform self-test for all modules.

    Is DTC U0100:00 set in the ABS module or in the RCM? 

    Yes  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, GO to  A7
    No  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 BECMB. REFER to: Battery Energy Control Module B (BECMB) .

  10. A7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    NOTE: Make sure all SRS components and the RCM electrical connectors are connected before carrying out the self-test. If not, Diagnostic Trouble Codes (DTCs) will be recorded.

    • Ignition OFF.

    • Disconnect and inspect the PCM connectors.

      • inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wire harness for any damaged, pinched, cut or pierced wires.
      • inspect Connector Position Assurance (CPA) levers/locks for correct operation.
      • repair any concerns found. Refer to Connector Repair Procedures for schematic and connector information.

    • Prior to reconnecting any previously disconnected component:

      • inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wire harness for any damaged, pinched, cut or pierced wires.
      • inspect Connector Position Assurance (CPA) levers/locks for correct operation.
      • repair any concerns found. Refer to Connector Repair Procedures for schematic and connector information.

    • Reconnect the PCM connectors. Make sure they seat and latch correctly.

    • Ignition ON.

    • Using a diagnostic scan tool, perform RCM self-test.

    Was the original DTC retrieved on-demand during self-test? 

    Yes  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, Refer to PCM Guided Routine .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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