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Home >> Ford >> 2015 >> Explorer Limited, 3.5L Eng VIN 8, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control - DATC >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Pinpoint Test F : B1B71:11, B1B71:15 >> Pinpoint Test F : B1B71:11, B1B71:15

Pinpoint Test F : B1B71:11, B1B71:15

  1. F1 CHECK THE HVAC MODULE OUTPUT VOLTAGE

    • Disconnect: Evaporator Temperature Sensor.
    • Ignition ON.
    • Press the POWER button on the HVAC controls.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C296-1
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 C296-2

    Is the voltage between 4.7 and 5.1 volts? 

    Yes  INSTALL a new evaporator temperature sensor (part of 19850). Refer to Heater Core And Evaporator Core Housing . CLEAR the DTCs and REPEAT the self-test. If the DTC returns, GO to  F7.
    No  For DTC B1B71:11, GO to  F5. For DTC B1B71:15, GO to  F2.

  2. F2 CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Disconnect: HVAC Module C228A.
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C228A-19
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  F3.

  3. F3 CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C228A-19
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C296-1

    Is the resistance less than 3 ohms? 

    Yes  GO to  F4.
    No  REPAIR the circuit.

  4. F4 CHECK THE EVAPORATOR TEMPERATURE SENSOR SIGNAL RETURN CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C228A-23
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C296-2

    Is the resistance less than 3 ohms? 

    Yes  CONNECT the evaporator temperature sensor. GO to  F7.
    No  REPAIR the circuit.

  5. F5 CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO THE SIGNAL RETURN CIRCUIT

    • Ignition OFF.
    • Disconnect: HVAC Module C228A.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C296-2
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C296-1

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  F6.
    No  REPAIR the circuits.

  6. F6 CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C228A-19
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  CONNECT the evaporator temperature sensor. GO to  F7.
    No  REPAIR the circuit.

  7. F7 CHECK FOR CORRECT HVAC MODULE OPERATION

    • Ignition OFF.
    • Disconnect and inspect all HVAC module 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 HVAC module 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  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. Refer to Heating Ventilation Air Conditioning (HVAC) Module .
    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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