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Pinpoint Test R: P0A45

  1. NOTE: The Inverter System Controller (ISC) is referred to as the SOBDMC (Secondary On-Board Diagnostic Control Module C) in the scan tool.
    NOTE: Drive Motor B refers to the electric generator. Drive Motor A refers to the electric motor.

    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 P0A45:00 Drive Motor 'B' Position Sensor Circuit: No Sub Type Information This DTC sets when generator resolver feedback signal is shorted to ground

    Possible Causes 

    • Wiring, terminals or connectors
    • Transmission assembly

  2. R1 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) CALIBRATION LEVEL

    NOTE: Wiring overlays or repinning of circuits are NOT  appropriate for DTC P0A45 due to risk of hardware damage.

    • 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  R2
    No  UPDATE the Inverter System Controller (ISC) to the latest calibration level.

  3. R2 VISUAL INSPECTION OF THE LOW VOLTAGE SYSTEM

    • Ignition OFF.

    • Visually inspect all the low voltage cables.

    • Make sure all the low voltage connectors are correctly and securely connected and latched.

    • Examine all the low voltage cables and connectors for damaged, burned or overheated insulation and loose or broken conditions.

    Is a concern present? 

    Yes  REPLACE the cable. CLEAR the Inverter System Controller (ISC) diagnostic trouble codes (DTCs) and REPEAT the self-test.
    No  GO to  R3

  4. R3 CHECK FOR CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (DTCS) IN THE INVERTER SYSTEM CONTROLLER (ISC)

    • Ignition ON.

    • Using a diagnostic scan tool, check for continuous memory codes in the Inverter System Controller (ISC).

    Were any diagnostic trouble codes (DTCs) received? 

    Yes  For P0A45 with P0C6B ONLY, GO to  R4For P0A45 with P0C6C ONLY, GO to  R6For P0A45 with P0C66 ONLY, GO to  R8For P0A45 with P0C67 ONLY, GO to  R10For P0A45 with P0C5F ONLY, GO to  R12For P0A45 with P0A3F ONLY, GO to  R16For P0A45 ONLY, GO to  R20
    For all other Diagnostic Trouble Codes (DTCs) refer to the Master 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.

  5. R4 CHECK FOR GS2 SHORT TO GROUND

    • Disconnect HF45 Transmission C1111.

    • Disconnect Inverter System Controller (ISC) C199B.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 33
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  R5
    No  REPLACE the harness.

  6. R5 CHECK FOR GS4 SHORT TO GROUND

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 23
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  R28
    No  REPLACE the harness.

  7. R6 CHECK FOR GS2 SHORT TO POWER

    • Disconnect HF45 Transmission C1111.

    • Disconnect Inverter System Controller (ISC) C199B.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 33
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPLACE the harness.
    No  GO to  R7

  8. R7 CHECK FOR GS4 SHORT TO POWER

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 23
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPLACE the harness.
    No  GO to  R28

  9. R8 CHECK FOR GS1 SHORT TO GROUND

    • Disconnect HF45 Transmission C1111.

    • Disconnect Inverter System Controller (ISC) C199B.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 32
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  R9
    No  REPLACE the harness.

  10. R9 CHECK FOR GS3 SHORT TO GROUND

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 22
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  R28
    No  REPLACE the harness.

  11. R10 CHECK FOR GS1 SHORT TO POWER

    • Disconnect HF45 Transmission C1111.

    • Disconnect Inverter System Controller (ISC) C199B.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 32
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPLACE the harness.
    No  GO to  R11

  12. R11 CHECK FOR GS3 SHORT TO POWER

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 22
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPLACE the harness.
    No  GO to  R28

  13. R12 CHECK FOR GR1 OPEN

    • Disconnect HF45 Transmission C1111.

    • Disconnect Inverter System Controller (ISC) C199B.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 31
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 C199B Pin 19

    Is the resistance less than 3 ohms? 

    Yes  GO to  R13
    No  REPLACE the harness.

  14. R13 CHECK FOR GR2 OPEN

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 21
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 C199B Pin 13

    Is the resistance less than 3 ohms? 

    Yes  GO to  R14
    No  REPLACE the harness.

  15. R14 CHECK FOR GR2 SHORT TO GROUND

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 21
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  R15
    No  REPLACE the harness.

  16. R15 CHECK FOR GR2 SHORT TO POWER

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 21
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPLACE the harness.
    No  GO to  R28

  17. R16 CHECK FOR MR1 SHORT TO GROUND

    • Disconnect HF45 Transmission C1111.

    • Disconnect Inverter System Controller (ISC) C199B.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 11
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  R17
    No  REPLACE the harness.

  18. R17 CHECK FOR MR1 SHORT TO POWER

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 11
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPLACE the harness.
    No  GO to  R18

  19. R18 CHECK FOR GR1 SHORT TO GROUND

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 31
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  R19
    No  REPLACE the harness.

  20. R19 CHECK FOR GR1 SHORT TO POWER

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 31
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPLACE the harness.
    No  GO to  R28

  21. R20 CHECK FOR GS1 OPEN

    • Disconnect HF45 Transmission C1111.

    • Disconnect Inverter System Controller (ISC) C199B.

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 32
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 C199B Pin 21

    Is the resistance less than 3 ohms? 

    Yes  GO to  R21
    No  REPLACE the harness.

  22. R21 CHECK FOR GS2 OPEN

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 33
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 C199B Pin 22

    Is the resistance less than 3 ohms? 

    Yes  GO to  R22
    No  REPLACE the harness.

  23. R22 CHECK FOR GS3 OPEN

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 22
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 C199B Pin 8

    Is the resistance less than 3 ohms? 

    Yes  GO to  R23
    No  REPLACE the harness.

  24. R23 CHECK FOR GS4 OPEN

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 3
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 C199B Pin 15

    Is the resistance less than 3 ohms? 

    Yes  GO to  R24
    No  REPLACE the harness.

  25. R24 CHECK FOR MR1 SHORT TO GROUND

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 11
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  R25
    No  REPLACE the harness.

  26. R25 CHECK FOR MR1 SHORT TO POWER

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 11
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPLACE the harness.
    No  GO to  R26

  27. R26 CHECK FOR GR1 SHORT TO GROUND

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 31
      GFD826402Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10K ohms? 

    Yes  GO to  R27
    No  REPLACE the harness.

  28. R27 CHECK FOR GR1 SHORT TO POWER

    • Measure and record:
      Positive Lead Measurement / Action Negative Lead
      C1111 Pin 31
      GFD826403Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPLACE the harness.
    No  GO to  R28

  29. R28 CHECK FOR CORRECT INVERTER SYSTEM CONTROLLER (ISC) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all Inverter System Controller (ISC) 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 Inverter System Controller (ISC) connectors. Make sure they seat and latch correctly.

    • Connect HF45 Transmission C1111.

    • Ignition ON.

    • Ignition OFF.

    • Wait 5 minutes.

    • Ignition ON.

    • Clear the Inverter System Controller (ISC) diagnostic trouble codes (DTCs).

    • Ignition OFF.

    • Start the engine.

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

    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, REFER to GO to Pinpoint Test S 
    (In step S4 continue through to step S5 regardless of DTC presence.)
    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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