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Home >> Ford >> 2024 >> Escape ST-Line Select >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electric Powertrain Control - (Diagnosis & Testing Pinpoint Test A - AY) >> Diagnosis And Testing >> Electric Powertrain Control >> Pinpoint Tests >> Pinpoint Test Q: P0A3C:94

Pinpoint Test Q: P0A3C:94

  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 P0A3C:94 Drive Motor 'A' Inverter Over Temperature: Unexpected Operation This DTC sets when the module senses an elevated internal temperature

    Possible Causes 

    • Wiring, terminals or connectors
    • Electric powertrain cooling concern
    • Motor Electronics coolant pump
    • Low coolant level
    • Coolant flow restriction (blockage or kinked hoses)
    • Airlock in system

  2. Q1 CHECK FOR BECM (BATTERY ENERGY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

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

    Are any coolant pump Diagnostic Trouble Codes (DTCs) present in the BECM ' 

    Yes  DIAGNOSE any coolant pump Diagnostic Trouble Codes (DTCs). For HEV, REFER to: High Voltage Battery, Mounting and Cables - Plug-In Hybrid Electric Vehicle (PHEV) in the appropriate High Voltage Battery, Mounting and Cables article. For PHEV, REFER to: DIAGNOSTIC TROUBLE CODE (DTC) CHART .
    No  GO to  Q2

  3. Q2 CHECK FOR PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

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

    Are any automatic grill shutter or cooling fan Diagnostic Trouble Codes (DTCs) present in the PCM ' 

    Yes  DIAGNOSE any grill shutter or cooling Diagnostic Trouble Codes (DTCs). REFER to: Electronic Engine Controls .
    No  GO to  Q3

  4. Q3 CHECK THE COOLING FAN AND ACTIVE GRILLE SHUTTER OPERATION

    NOTE: Verify radiator cooling fan operation before proceeding with this test

    Access the PCM and monitor the GRILL_A_CMD (% Open) PID

    Access the PCM and monitor the HFCPID

    • Verify the cooling fan and active grille shutter operate correctly.

    Do the active grille shutter and cooling fan operate correctly? 

    Yes  GO to  Q4
    No  To diagnosis the cooling fan, REFER to: Electric Powertrain Cooling .
    To diagnosis the active grille shutter, REFER to: ACTIVE GRILLE SHUTTER .

  5. Q4 CHECK THE COOLANT LEVEL

    • Inspect the electrified drivetrain cooling system level.

    Is the coolant at the correct level? 

    Yes  GO to  Q6
    No  REFER to: ELECTRIC POWERTRAIN COOLING SYSTEM DRAINING, FILLING AND BLEEDING .

  6. Q5 CHECK FOR A RECENT COOLANT FILL

    • Inspect the coolant for signs of a recent fill.

    Has the coolant system been recently filled? 

    Yes  PERFORM the system fill procedure to bleed air from the system, add coolant if needed. REFER to: ELECTRIC POWERTRAIN COOLING SYSTEM DRAINING, FILLING AND BLEEDING .
    No  GO to  Q6

  7. Q6 INSPECT THE COOLANT FOR CONTAMINATION

    • Inspect the coolant.

    Is the coolant contaminated? 

    Yes  REFER to: ELECTRIC POWERTRAIN COOLING SYSTEM DRAINING, FILLING AND BLEEDING .
    No  GO to  Q7

  8. Q7 INSPECT THE RADIATOR

    • Inspect the radiator for any obstruction.

    Is the radiator obstructed? 

    Yes  REPAIR as necessary.
    No  GO to  Q8

  9. Q8 INSPECT THE MOTOR ELECTRONICS COOLING SYSTEM HOSES

    • Inspect the motor electronics cooling system hoses for kinks, leaks, improper routing or connections.

    Is a concern present? 

    Yes  REPAIR as necessary.
    No  GO to  Q9

  10. Q9 INSPECT FOR INTERNAL AND EXTERNAL COOLANT LEAKS

    • Inspect the coolant system for leaks.

    Are any leaks present? 

    Yes  REPAIR as necessary.
    No  GO to  Q10

  11. Q10 ACTIVE COMMAND THE COOLANT PUMP

    • Ignition ON.

    Access the BECM and control the COOL_PMP_B_CMD (%) PID

    • Using a diagnostic scan tool, active command the coolant pump to 100% for 5 minutes. Confirm if the affected coolant pump is running by feeling the pump for vibration.

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

    Is DTC P0A06:00, P0A07:00, P0C73:00, P2D00:00, P2D01:00, P2D02:00, P2D03:00, and/or P2D04:00 present OR is the affected coolant pump inoperative? 

    Yes  DIAGNOSE the BECMDTC s and/or the inoperative coolant pump. REFER to: DIAGNOSTIC TROUBLE CODE (DTC) CHART .
    No  GO to  Q11

  12. Q11 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) TEMPERATURE SENSOR CORRELATION

    • Cold soak the vehicle at ambient temperature for at least 6 hours.

    • Ignition ON.

    Access the SOBDMC and monitor the G_PHTMP (Deg C) PID

    Access the SOBDMC and monitor the M_PHTMP (Deg C) PID

    • Road test the vehicle while monitoring the PID s.

    Do the temperatures PID indicate greater than 115deg.C (239deg.F)? 

    Yes  REFER to: Electric Powertrain Cooling .
    No  GO to  Q12

  13. Q12 VERIFY MECS PUMP OPERATION

    • Ignition OFF.

    • Disconnect and inspect all MECS pump 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 MECS pump connectors. Make sure they seat and latch correctly.

    • Ignition ON.

    • Monitor the Motor Electronics Cooling Pump,

      Access the BECM and monitor the COOL_PMP_B_STATPID

    • Carefully wiggle all accessible wiring and connectors associated with the MECS PUMP from the BECM to the pump, and look for a change in the PID state.

    Is a concern present during the wiggle test? 

    Yes  If BECMDTC s are present REFER to: DIAGNOSTIC TROUBLE CODE (DTC) CHART . If there are no BECMDTC s present, REPAIR wiring as necessary.
    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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