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Pinpoint Test BQ : U069E:81, U069E:87

  1. 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 U069E:81 Lost Communication with Coolant Heater "A": Invalid Serial Data Received This DTC sets when messages are missing from the Coolant Heater "A".
    SOBDMC U069E:87 Lost Communication with Coolant Heater "A": Missing Message This DTC sets when messages are missing from the Coolant Heater "A".

    Possible Sources 

    • Communications network concern
    • Inverter System Controller (ISC) software
    • Coolant Heater "A"

  2. BQ1 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, perform the Inverter System Controller (ISC) self-test.

    Are any Inverter System Controller (ISC) DTCs present? 

    Yes  For DTC U069E:81 GO to  BQ2 For DTC U069E:87 GO to  BQ4 For all other Inverter System Controller (ISC) DTCs, REFER to the Diagnostic Trouble Code (DTC) Chart  .
    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.

  3. BQ2 VERIFY THE INVERTER SYSTEM CONTROLLER (ISC) CALIBRATION LEVEL

    • Verify the Inverter System Controller (ISC) is at the latest calibration level.

    Is the Inverter System Controller (ISC) at the latest calibration level? 

    Yes  GO to  BQ3
    No  UPDATE the Inverter System Controller (ISC) to the latest calibration level.

  4. BQ3 CLEAR AND CHECK THE INVERTER SYSTEM CONTROLLER (ISC) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, clear the Inverter System Controller (ISC) DTCs.

    • Using a diagnostic scan tool, perform the Inverter System Controller (ISC) self-test.

    Is DTC U069E:81 present in the Inverter System Controller (ISC)? 

    Yes  GO to  BQ4
    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.

  5. BQ4 CARRY OUT A VEHICLE INSPECTION AND VERIFY THE SELF-TEST PROCEDURE

    NOTE: If the self-test or communication concern occurred after a failed or aborted reprogram, the module may be blank. Attempt to reprogram the module again before continuing with this pinpoint test.

    • Visually inspect the following for obvious signs of electrical damage:

      • harness wiring
      • electrical connections

    Was the correct self-test procedure used? 

    Yes  GO to  BQ5
    No  Refer to SCAN TOOL SETUP AND FUNCTIONALITY .

  6. BQ5 CARRY OUT THE NETWORK TEST

    • Note:  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.

    Do all modules indicate pass? 

    Yes  GO to  BQ6
    No  GO to  BQ7

  7. BQ6 CHECK FOR A COOLANT HEATER "A" CONCERN

    • Using a diagnostic scan tool, perform the Inverter System Controller (ISC) self-test.

    • Check for any other Coolant Heater "A" related symptoms.

    Is a concern present? 

    Yes  DIAGNOSE the Coolant Heater "A" concern. REFER to: Climate Control System .
    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.

  8. BQ7 INVERTER SYSTEM CONTROLLER (ISC) SELF-TEST

    • Confirm the Inverter System Controller (ISC) was the only module to fail.

    Was the Inverter System Controller (ISC) the only module to fail? 

    Yes  GO to  BQ8
    No  DIAGNOSE the network concern. REFER to: Communications Network .

  9. BQ8 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) B+ CIRCUIT FOR VOLTAGE

    • Ignition OFF.

    • Disconnect Inverter System Controller (ISC) C1458A.

    • Ignition ON.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1458A-M1
      GFD513962Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 10.5 volts? 

    Yes  GO to  BQ9
    No  REPAIR the circuit.

  10. BQ9 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) VPWR CIRCUITS FOR VOLTAGE

    • Ignition OFF.

    • Connect a 5A fused jumper between:
      Positive Lead Measurement / Action Negative Lead
      C1458A-K3
      GFD513963Courtesy of FORD MOTOR COMPANY
      		 Ground

    • Ignition ON.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1458A-L2
      GFD513962Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1458A-M2
      GFD513962Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 10.5 volts? 

    Yes  GO to  BQ10
    No  REPAIR the circuit.

  11. BQ10 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) GROUND CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1458A-L4
      GFD513961Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1458A-M4
      GFD513961Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances less than 5 ohms? 

    Yes  DIAGNOSE the network concern. REFER to: Communications Network .
    No  REPAIR the open circuit.
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