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PINPOINT TEST G: DTCs B1B71:11 AND 15

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK THE SENSOR RESISTANCE 
    • Ignition OFF.
    • Disconnect: HVAC Module - Electronic Manual Temperature Control (EMTC) C2357a.
    • Disconnect: HVAC Module - Dual Automatic Temperature Control (DATC) C2356a.
    • Measure the resistance between HVAC module - EMTC  C2357a-6 or HVAC module - DATC  C2356a-6, circuit VH406 (VT/BN), harness side and HVAC module - EMTC  C2357a-10 or HVAC module - DATC  C2356a-10, circuit RH111 (GY/BU), harness side and compare to the table below.
      TEMPERATURE RESISTANCE REFERENCE TABLE

      Ambient Temperature Resistance
      -40°C (-40°F) 832,519-1,017,523 ohms
      -20°C (-4°F) 263,111-290,807 ohms
      0°C (32°F) 91,058-100,644 ohms
      20°C (68°F) 35,473-39,207 ohms
      25°C (77°F) 28,500-31,500 ohms
      40°C (104°F) 15,307-16,919 ohms
      60°C (140°F) 7,171-7,925 ohms
      80°C (176°F) 3,630-4,042 ohms
      Fig 1: Checking Sensor Resistance
      G06262548Courtesy of FORD MOTOR CO.
    • Is the resistance within the specified values for the temperatures? 
    • Yes: For DTC B1B71:11  , GO to  G2.

      For DTC B1B71:15  , GO to  G3.

    • No: For DTC B1B71:11  , GO to  G4.

      For DTC B1B71:15  , GO to  G5.

  2. G2 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO GROUND 
    • Measure the resistance between HVAC module - EMTC  C2357a-6 or HVAC module - DATC  C2356a-6, circuit VH406 (VT/BN), harness side and ground.
      Fig 2: Checking Circuit VH406 (VT/BN) For Short To Ground
      G06262549Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to  G7.
    • No:  REPAIR circuit VH406 (VT/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  3. G3 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between ground and HVAC module - EMTC  C2357a-6 or HVAC module - DATC  C2356a-6, circuit VH406 (VT/BN), harness side and ground.
      Fig 3: Checking Circuit VH406 (VT/BN) For Short To Voltage
      G06262550Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR circuit VH406 (VT/BN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No:  GO to  G7.
  4. G4 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO CIRCUIT RH111 (GY/BU) 
    NOTE: Instrument panel removal is required to disconnect the sensor. Before carrying out this test step, visually inspect the wiring between the HVAC module and sensor for shorts. If no damage is visually evident, proceed with the test.
    • Ignition OFF.
    • Disconnect: Evaporator Discharge Air Temperature Sensor C2295.
    • Measure the resistance between HVAC module - EMTC  C2357a-6 or HVAC module - DATC  C2356a-6, circuit VH406 (VT/BN), harness side and HVAC module - EMTC  C2357a-10 or HVAC module - DATC  C2356a-10, circuit RH111 (GY/BU), harness side.
      Fig 4: Checking Circuit VH406 (VT/BN) For Short To Circuit RH111 (GY/BU)
      G06262551Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  INSTALL a new evaporator discharge air temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No:  REPAIR circuit VH406 (VT/BN) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. G5 CHECK CIRCUITS VH406 (VT/BN) FOR AN OPEN 
    NOTE: Instrument panel removal is required to disconnect the sensor. Before carrying out this test step, visually inspect the wiring between the HVAC module and sensor for opens. If no damage is visually evident, proceed with the test.
    • Ignition OFF.
    • Disconnect: Evaporator Discharge Air Temperature Sensor C2295.
    • Measure the resistance between HVAC module - EMTC  C2357a-6 or HVAC module - DATC  C2356a-6, circuit VH406 (VT/BN), harness side and inline (EMTC  ) C211-13 or (DATC  ) inline C213-13, circuit VH406 (VT/BN), instrument panel harness side.
      Fig 5: Checking Circuits VH406 (VT/BN) For Open
      G06262552Courtesy of FORD MOTOR CO.
    • Measure the resistance between inline (EMTC  ) C211-13 or (DATC  ) inline C213-13, circuit VH406 (VT/BN), HVAC case harness side and evaporator discharge air temperature sensor C2295-1, circuit VH406 (VT/BN), harness side.
      Fig 6: Measuring Resistance Between HVAC Case & Evaporator Discharge Air Temperature Sensor Harness Side
      G06262553Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  G6.
    • No:  REPAIR circuit VH406 (VT/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. G6 CHECK CIRCUITS RH111 (GY/BU) FOR AN OPEN 
    • Measure the resistance between HVAC module - EMTC  C2357a-10 or HVAC module - DATC  C2356a-10, circuit RH111 (GY/BU), harness side and inline (EMTC  ) C211-15 or (DATC  ) inline C213-15, circuit RH111 (GY/BU), instrument panel harness side.
      Fig 7: Checking Circuits RH111 (GY/BU) For Open
      G06262554Courtesy of FORD MOTOR CO.
    • Measure the resistance between inline (EMTC  ) C211-15 or (DATC  ) inline C213-15, circuit RH111 (GY/BU), HVAC case harness side and evaporator discharge air temperature sensor C2295-2, circuit RH111 (GY/BU), harness side.
      Fig 8: Measuring Resistance Between HVAC Case & Evaporator Discharge Air Temperature Sensor Harness Side
      G06262555Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  INSTALL a new evaporator discharge air temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No:  REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  7. G7 CHECK THE MODULE CONNECTION 
    • Inspect the module connectors for:
      • corrosion.
      • pushed-out terminals.
      • damaged terminals.
    • Connect and correctly seat all the HVAC module connectors.
    • Clear the DTCs.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new HVAC module. REFER to REMOVAL AND INSTALLATION (Fusion, Milan) and REMOVAL AND INSTALLATION (MKZ) . TEST the system for normal operation.
    • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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