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Pinpoint Test BP: U0293

  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
    PCM U0293:00 Lost Communication With Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when messages are missing from the Inverter System Controller (ISC).
    BECM U0293:00 Lost Communication With Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when messages are missing from the Inverter System Controller (ISC).
    IPC U0293:00 Lost Communication With Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when messages are missing from the Inverter System Controller (ISC).
    IPC U0293:87 Lost Communication With Hybrid/EV Powertrain Control Module 'A': Missing Message This DTC sets when messages are missing from the Inverter System Controller (ISC).
    IPC U0594:00 Invalid Data Received From Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when invalid data is received from the from the Inverter System Controller (ISC).
    APIM U0293:00 Lost Communication With Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when messages are missing from the Inverter System Controller (ISC).
    PAM U0293:00 Lost Communication With Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when messages are missing from the Inverter System Controller (ISC).
    BCM U0293:00 Lost Communication With Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when messages are missing from the Inverter System Controller (ISC).
    BCMC U0293:00 Lost Communication With Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when messages are missing from the Inverter System Controller (ISC).
    DCDC U0293:00 Lost Communication With Hybrid/EV Powertrain Control Module 'A': No Sub Type Information This DTC sets when messages are missing from the Inverter System Controller (ISC).
    SOBDMB U0293:87 Lost Communication With Hybrid/EV Powertrain Control Module 'A': Missing Message This DTC sets when messages are missing from the Inverter System Controller (ISC).

    Possible Causes 

    • Wiring, terminals or connectors
    • Inverter System Controller (ISC)

  2. BP1 CARRY OUT THE NETWORK TEST

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • When using FDRS, the scan tool attempts to communicate with the PCM first. After establishing communication with the PCM, the scan tool then attempts to communicate with all modules on the vehicle. If an FDRS session cannot be established, FDRS may state no communication can be established with the PCM :

      • Choose No when the scan tool prompts whether or not to retry communication.
      • Enter a PCM part number, tear tag or calibration number to identify the vehicle and start a session. The PCM part number and 4- character tear tag are located on the PCM.

    • Ignition ON.

    Is the Inverter System Controller (ISC) the only module offline? 

    Yes  GO to  BP3
    No  DIAGNOSE the network concern. REFER to: Communications Network in the appropriate Moduel Communications Network article.

  3. BP2 UPDATE THE MODULE REPORTING U0293 TO ITS LATEST SOFTWARE LEVEL

    • Update the software of the module reporting the U0293 or U0594.

    Is there an updated version of software? 

    Yes  UDPATE the software, then clear the DTCs. Repeat the module's self-test. If DTC U0293 or U0594 returns, GO to  BP3
    If U0293 or U0594 do not return, the system is operating correctly at this time. The DTC may have been set due to outdated software.
    No  GO to  BP3

  4. BP3 UPDATE THE INVERTER SYSTEM CONTROLLER (ISC) SOFTWARE

    • Attempt to update the Inverter System Controller (ISC) software, regardless of whether the ISC responds to the network tool

    Was the Inverter System Controller (ISC) software update successful? 

    Yes  CLEAR the DTC s and REPEAT the self-test. If DTC U0293 or U0594 returns. GO to  BP4
    If DTC U0293 or U0594 do not return, the system is operating correctly at this time. The DTC may have been set due the software being erased.
    No  GO to  BP4

  5. BP4 CHECK FOR AN INTERMITTENT CONCERN

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Using a diagnostic scan tool, refer to the snapshot data to determine when the fault occurs. Determine if the fault occurs during the following conditions:

      • During power-up
      • While driving
      • Temperature of vehicle

    • Attempt to duplicate the concern.

    Can the fault be duplicated? 

    Yes  GO to  BP5
    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. BP5 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) VBATT CIRCUIT FOR VOLTAGE

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Ignition OFF.

    • Disconnect Inverter System Controller (ISC) C199A.

    • Ignition ON.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 34
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage within 1.5 volts of battery voltage? 

    Yes  GO to  BP6
    No  With the aid of the wiring diagram, REPAIR the circuit. CLEAR the DTC s and REPEAT the self-test.

  7. BP6 INSPECT THE GROUND CIRCUITS

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Ignition OFF.

    • Disconnect and inspect ground circuits G102, G103, G104, G200 and G305 for corrosion or loose connections.

    Is a concern present? 

    Yes  Repair as necessary. CLEAR the DTC s and REPEAT the self-test.
    No  GO to  BP7

  8. BP7 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) GROUND CIRCUITS

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Ignition OFF.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 9
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground
      C199A Pin 10
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances less than 3 ohms on both pins? 

    Yes  GO to  BP8
    No  With the aid of the wiring diagram, REPAIR the open circuit. CLEAR the DTC s and REPEAT the self-test.

  9. BP8 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) PSR CONTROL WIRE

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      GEMPTY000Courtesy of FORD MOTOR COMPANY
      GFD826403Courtesy of FORD MOTOR COMPANY
      GEMPTY000Courtesy of FORD MOTOR COMPANY

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 14
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage within 1.5 volts of battery voltage? 

    Yes  GO to  BP10
    No  GO to  BP9

  10. BP9 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) PSR CONTROL WIRE FOR AN OPEN

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Ignition OFF.

    • Ignition ON.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1002 Pin 9
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 C199A Pin 14

    Is the resistance less than 3 ohms? 

    Yes  GO to  BP10
    No  REPAIR the open circuit.

  11. BP10 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) VPWR CIRCUITS FOR A SHORT TO VOLTAGE

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 39
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground
      C199A Pin 40
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  With the aid of the wiring diagram, REPAIR the short circuit. CLEAR the DTC s and REPEAT the self-test.
    No  GO to  BP11

  12. BP11 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) VPWR CIRCUITS FOR VOLTAGE

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Ignition OFF.

    • Connect a 5A fused jumper between:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 14
      GFD826692Courtesy of FORD MOTOR COMPANY
      		 Ground

    • Ignition ON.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 39
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground
      C199A Pin 40
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage within 1.5 volts of battery voltage? 

    Yes  GO to  BP12
    No  With the aid of the wiring diagram, REPAIR the open circuit. CLEAR the DTC s and REPEAT the self-test.

  13. BP12 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) CAN (CONTROLLER AREA NETWORK) CIRCUITS

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Ignition OFF.

    • Disconnect GWM C2431.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C2431 Pin 17
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 C199A Pin 11
      C2431 Pin 4
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 C199A Pin 1

    Is the resistance less than 5 ohms? 

    Yes  GO to  BP15
    No  With the aid of the wiring diagram, REPAIR the open circuit. CLEAR the DTC s and REPEAT the self-test.

  14. BP13 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) ISP-R CIRCUIT FOR VOLTAGE

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Ignition ON.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 4
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage within 1.5 volts of battery voltage? 

    Yes  GO to  BP14
    No  With the aid of the wiring diagram, REPAIR the circuit. CLEAR the DTC s and REPEAT the self-test.

  15. BP14 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) WAKE UP CIRCUIT FOR VOLTAGE

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C199A Pin 13
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage within 1.5 volts of battery voltage? 

    Yes  GO to  BP15
    No  With the aid of the wiring diagram, REPAIR the circuit. CLEAR the DTC s and REPEAT the self-test.

  16. BP15 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) CONNECTORS

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

    • Disconnect and inspect all the Inverter System Controller (ISC) connectors.

    • Visually inspect for:

      • Spread or loose terminals
      • Corrosion
      • Damaged, bent or pushed out pins

    Is a concern present? 

    Yes  REPAIR as necessary. CLEAR the DTC s and REPEAT the self-test.
    No  GO to  BP16

  17. BP16 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) FOR CORRECT OPERATION

    NOTE: Do not use dielectric grease in the Inverter System Controller (ISC) connector.

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

    • Reconnect all the Inverter System Controller (ISC) connectors and make sure they seat and latch correctly.

    • Using a diagnostic scan-tool, clear the DTC s in the module reporting DTC U0293.

    • Using a diagnostic scan-tool, repeat the self-test.

    Is DTC U0293 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 Inverter System Controller (ISC). REFER to: Inverter System Controller [SOBDMC] .
    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.
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