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Pinpoint Test R : B10B6:11, B10B6:15

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  1. Automatic Climate Control System for schematic and connector information.

    Normal Operation and Fault Conditions 

    Sensor inputs, footwell air discharge temperature sensor, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    HVAC B10B6:11 Left Floor Air Discharge Temperature: Circuit Short To Ground This DTC sets when the HVAC module senses lower than expected voltage on the LH sensor feedback circuit, indicating a short to ground.
    HVAC B10B6:15 Left Floor Air Discharge Temperature: Circuit Short To Battery Or Open This DTC sets when the HVAC module senses greater than expected voltage on the LH sensor feedback circuit, indicating a short to voltage or an open circuit or sensor.

    Possible Sources 

    • Wiring, terminals or connectors
    • Footwell air discharge temperature sensor
    • HVAC control module

    Visual Inspection and Pre-checks 

    • Inspect loose or corroded HVAC control module and footwell air discharge temperature sensor connections.

  2. NOTE: Use the correct probe adapter(s) when making measurements. Failure to. Use the correct probe adapter(s) may damage the connector.

  3. R1 CHECK THE FOOTWELL AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect HVAC control module C294A.

    • Disconnect HVAC control module C294B.

    • Disconnect Footwell air discharge temperature sensor C2439.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C2439-1
      GFD328094Courtesy of FORD MOTOR COMPANY
      		 Ground
      Refer to C2439-2
      GFD328094Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the affected circuits.
    No  GO to  R2

  4. R2 CHECK THE FOOTWELL AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C2439-1
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Ground
      Refer to C2439-2
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  R3
    No  REPAIR the affected circuits.

  5. R3 CHECK THE FOOTWELL AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C2439-1
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Refer to C294B-4
      Positive Lead Measurement / Action Negative Lead
      Refer to C2439-2
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Refer to C294A-2

    Are the resistances less than 3 ohms? 

    Yes  GO to  R4
    No  REPAIR the affected circuits.

  6. R4 CHECK THE FOOTWELL AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TOGETHER

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Refer to C2439-1
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Refer to C2439-2

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  R5
    No  REPAIR the circuits.

  7. R5 CHECK FOR CORRECT FOOTWELL AIR DISCHARGE TEMPERATURE SENSOR OPERATION

    • Ignition OFF.

    • Inspect the disconnected 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 all disconnected 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  INSTALL a new footwell air discharge temperature sensor. REFER to: Footwell Air Discharge Temperature Sensor . TEST the system for normal operation. If the concern is still present, GO to  R6
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

  8. R6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

    • Ignition OFF.

    • Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

    • Repair:

      • corrosion (install new connector or terminal - clean module pins)
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary

    • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new HVAC control module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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