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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 - EMTC >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Pinpoint Test D : B1B71:11, B1B71:15 >> Pinpoint Test D : B1B71:11, B1B71:15

Pinpoint Test D : B1B71:11, B1B71:15

  1. D1 CHECK THE HVAC MODULE OUTPUT VOLTAGE

    • 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  D7.
    No  For DTC B1B71:11, GO to  D5. For DTC B1B71:15, GO to  D2.

  2. D2 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  D3.

  3. D3 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  D4.
    No  REPAIR the circuit.

  4. D4 CHECK THE 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  GO to  D7.
    No  REPAIR the circuit.

  5. D5 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  D6.
    No  REPAIR the circuits.

  6. D6 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  GO to  D7.
    No  REPAIR the circuit.

  7. D7 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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