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Pinpoint Test BB: U301B

  1. NOTE: The Inverter System Controller (ISC) is referred to as the SOBDMC (Secondary On-Board Diagnostic Control Module C) in the scan tool.

    Normal Operation and Fault Conditions 

    REFER to: Electric Powertrain Control - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    SOBDMC U301B:00 Control Module Wake-up Circuit 'A' Low: No Sub Type Information This DTC sets when a short to ground wiring fault in the wake-up circuit is detected.

    Possible Causes 

    • Wiring, terminals or connectors
    • BECM
    • DCDC
    • PCM
    • ACCM
    • SOBDM

  2. BB1 CHECK THE WAKE UP PID (PARAMETER IDENTIFICATION)

    • Ignition ON.

    Access the SOBDMC and monitor the ECU_WAKEUPPID

    Does the PID on? 

    Yes  GO to  BB3
    No  GO to  BB2

  3. BB2 INTERMITTENT WIRING CHECK

    • Ignition ON.

    Access the SOBDMC and monitor the ECU_WAKEUPPID

    • Carefully wiggle all accessible wiring and connectors associated with the BJB and high voltage battery pack.

      • Wiggle the high voltage battery pack C4805A and harnesses.
      • Wiggle the high voltage battery pack inline connectors and harnesses.
      • Wiggle the DCDC connectors and harnesses.
      • Wiggle the DCDC inline connectors and harnesses.
      • Wiggle the PCM connectors and harnesses.
      • Wiggle the PCM inline connectors and harnesses.
      • Wiggle the SOBDM (Battery Charger Control Module) connectors and harnesses.
      • Wiggle the SOBDM (Battery Charger Control Module) inline connectors and harnesses.

    • Look for sudden changes in the PID value when the harness and connectors are wiggled.

    Does the PID value change when the harness and connectors are wiggled? 

    Yes  With the aid of the wiring diagram, REPAIR the circuit, paying particular attention to the part of the harness that was wiggled when the issue occurred.
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

  4. BB3 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect Inverter System Controller (ISC) C199A.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 3
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  BB4
    No  GO to  BB6

  5. BB4 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR AN OPEN

    • Disconnect High Voltage Battery C3733HEV or C3732PHEV .

    • Disconnect SOBDM (PHEV only) C3471A.

    Is the resistance less than 5 ohms? 

    Yes  GO to  BB5
    No  With the aid of the wiring diagram, REPAIR the open circuit.

  6. BB5 CHECK FOR CORRECT INVERTER SYSTEM CONTROLLER (ISC) OPERATION

    • Reconnect all previously disconnected connectors. Make sure they seat and latch correctly.

    • Ignition ON.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  GO to  BB6
    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. CLEAR the DTC s and REPEAT the self-test.

  7. BB6 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR A SHORT TO GROUND WITH THE BECM (BATTERY ENERGY CONTROL MODULE) DISCONNECTED

    • Ignition OFF.

    • Disconnect Inverter System Controller (ISC) C199A.

    • Disconnect High Voltage Battery C3733HEV or C3732PHEV .

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 3
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  BB7
    No  GO to  BB8

  8. BB7 CHECK FOR CORRECT BECM (BATTERY ENERGY CONTROL MODULE) OPERATION

    • Reconnect all previously disconnected connectors.

    • Disconnect and inspect all BECM connectors.

    • Repair:

      • Corrosion (install new connector or terminals - clean module pins)
      • Damaged or bent pins - install new terminals/pins
      • Pushed-out pins - install new pins as necessary

    • Reconnect the BECM connectors. 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 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 BECM. REFER to: Battery Energy Control Module (BECM) - Plug-In Hybrid Electric Vehicle (PHEV) .
    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.

  9. BB8 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR A SHORT TO GROUND WITH THE DCDC (DIRECT CURRENT/DIRECT CURRENT CONVERTER CONTROL MODULE) DISCONNECTED

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 3
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  BB9
    No  GO to  BB10

  10. BB9 CHECK FOR CORRECT DCDC (DIRECT CURRENT/DIRECT CURRENT CONVERTER CONTROL MODULE) OPERATION

    • Reconnect all previously disconnected connectors.

    • Disconnect and inspect all DCDC connectors.

    • Repair:

      • Corrosion (install new connector or terminals - clean module pins)
      • Damaged or bent pins - install new terminals/pins
      • Pushed-out pins - install new pins as necessary

    • Reconnect the DCDC connectors. 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 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 DCDC. REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module .
    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.

  11. BB10 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR A SHORT TO GROUND WITH THE PCM (POWERTRAIN CONTROL MODULE) DISCONNECTED

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 3
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  BB11
    No  For HEV, REPAIR the circuit.For PHEV, GO to  BB12

  12. BB11 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Reconnect all previously disconnected connectors.

    • Disconnect and inspect all PCM connectors.

    • Repair:

      • Corrosion (install new connector or terminals - clean module pins)
      • Damaged or bent pins - install new terminals/pins
      • Pushed-out pins - install new pins as necessary

    • Reconnect the PCM connectors. 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 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 Powertrain Control Module (PCM).only available in the on-line service information RVC: 
    Generate RVC only works in single-step view Generate RVC requires VIN entry  REFER to: Powertrain Control Module (PCM) .
    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.

  13. BB12 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR A SHORT TO GROUND WITH THE SOBDM (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE A) BATTERY CHARGER CONTROL MODULE (BCCM) DISCONNECTED

    • Disconnect SOBDM Battery Charger Control Module (BCCM) C3471A.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 3
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  BB13
    No  REPAIR the circuit.

  14. BB13 CHECK FOR CORRECT SOBDM (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE A) BATTERY CHARGER CONTROL MODULE (BCCM) OPERATION

    • Reconnect all previously disconnected connectors.

    • Disconnect and inspect all SOBDM Battery Charger Control Module (BCCM) connectors.

    • Repair:

      • Corrosion (install new connector or terminals - clean module pins)
      • Damaged or bent pins - install new terminals/pins
      • Pushed-out pins - install new pins as necessary

    • Reconnect the SOBDM Battery Charger Control Module (BCCM) connectors. 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 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 SOBDM Battery Charger Control Module (BCCM). REFER to: SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE A (SOBDM) - PLUG-IN HYBRID ELECTRIC VEHICLE (PHEV) .
    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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