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Pinpoint Test G: U012D, U042E

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  1. Refer to Wiring Diagrams Charging System for schematic and connector information.

    Normal Operation and Fault Conditions 

    The charging system supplies voltage to the battery and the vehicle electrical system through the battery B+ cable. The PCM monitors the generator output through a LIN communication circuit shared with the automatic grill shutters (AGS). The PCM uses this LIN circuit to communicate the desired voltage setpoint to the generator internal voltage regulator. The generator also uses this to communicate the generator load and error conditions to the PCM.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM U012D:00 Lost Communication With Generator "A" Control Module: No Sub Type Information Sets if the PCM does not detect communication through the LIN circuit. This can be a result of an open or short in the LIN circuit. This DTC also sets if the generator B+ circuit is open.
    PCM U042E:00 Invalid Data Received From Generator "A" Control Module: No Sub Type Information Sets when the PCM receives invalid data from the generator.

    Possible Sources 

    • Battery monitoring sensor
    • Generator
    • PCM
    • Active Grille Shutter
    • Wiring, terminals or connectors

    Visual Inspection and Pre-checks 

    • Inspect high current BJB for loose, damaged or corroded connections.
    • Inspect the BJB fuse 3 (275A).
    • Inspect the FEAD belt.
    • Inspect the battery monitoring sensor.

  2. NOTE: Make sure battery voltage is greater than 12.2 volts prior to and during this pinpoint test.
  3. NOTE: Do not have a battery charger attached during vehicle testing.

  4. G1 CHECK VEHICLE FOR PRESENCE OF GRILLE SHUTTERS

    • U012D or U0042 are usually caused by wiring or water intrusion in inline connectors.

    • Clear DTC's.

    • Start engine.

    • Run for 2 minutes.

    • check for DTC's.

    Did DTC's return? 

    Yes  GO to  G2
    No  GO to  G3

  5. G2 RETRIEVE PCM DIAGNOSTIC TROUBLE CODES (DTCS) WITH GRILLE SHUTTER ACTUATOR DISCONNECTED

    • Ignition OFF.

    • Disconnect Grille Shutter Actuator C1765 and C1766.

    • Ignition ON.

    • Clear the DTC codes.

    • Start the engine.

    • Wait two mimutes, Codes will not set unless engine is running.

    • Using a diagnostic scan tool, scan for DTC's.

    Is DTC U0284 or U0046 present? 

    Yes  GO to  G3
    No  INSTALL new grille shutter actuator. REFER to: Active Grille Shutter Actuator .

  6. G3 COMPARE THE GENERATOR B+ CIRCUIT TO BATTERY VOLTAGE

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      GFD560652Courtesy of FORD MOTOR COMPANY
      GFD560645Courtesy of FORD MOTOR COMPANY
      GFD560653Courtesy of FORD MOTOR COMPANY

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C102B-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage within 0.5 volt of the recorded battery voltage? 

    Yes  GO to  G4
    No  TIGHTEN or INSTALL a new generator B+ nut as needed. REFER to: Generator - 3.0L Power Stroke Diesel . VERIFY high current 
    BJB fuse 9 (500A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

  7. G4 CHECK THE GENERATOR LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect generator C102A.

    • Disconnect PCM C1233B.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C102A-1
      GFD560645Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  G5

  8. G5 CHECK THE GENERATOR LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C102A-1
      GFD560648Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  G6
    No  REPAIR the circuit.

  9. G6 CHECK THE GENERATOR LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR AN OPEN

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new generator. REFER to: Generator - 3.0L Power Stroke Diesel . REPEAT the PCM self-test. If DTC U012D is retrieved again, GO to  G7
    No  REPAIR the affected circuit.

  10. G7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • 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 TSB. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSB's address this concern, Refer to PCM GUIDED ROUTINE TESTING
    Internet Explorer version 11 or greater is required to perform this Pinpoint Test. 
    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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