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Home >> Ford >> 2011 >> Escape Base, 2.5 7, AWD, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Climate Control System - General Information And Diagnostics - (Hybrid)) >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Pinpoint Test H: DTCs B1B71:11 and 15 >> PINPOINT TEST H: DTCs B1B71:11 AND 15

PINPOINT TEST H: DTCs B1B71:11 AND 15

WARNING: This page is about a different variant/trim than selected.
  1. H1 CHECK THE SENSOR RESISTANCE 
    • Ignition OFF.
    • Disconnect: Evaporator Discharge Air Temperature Sensor C296.
    • Allow enough time for the evaporator to stabilize to the outside ambient temperature.
    • Measure the resistance between evaporator discharge air temperature sensor C296 terminals and compare to the table below.
      RESISTANCE REFERENCE TABLE

      Ambient Temperature Resistance
      -40°C (-40°F) 832,591-1,017,523 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
      100°C (212°F) 1,976-2,184 ohms
      120°C (248°F) 1,131-1,251 ohms
      Fig 1: Checking Evaporator Discharge Air Temperature Sensor Resistance
      G07440143Courtesy of FORD MOTOR CO.
    • Is the resistance within the specified values for the temperatures? 
    • Yes:  GO to H2  .
    • No:  INSTALL a new evaporator discharge air temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. H2 CHECK THE HVAC OUTPUT VOLTAGE 
    • Ignition ON.
    • Press the power button.
    • Measure the voltage between evaporator discharge air temperature sensor C296-1, circuit VH406 (VT/BN), harness side and C296-2, circuit RH111 (GY/BU), harness side.
      Fig 2: Measuring Voltage Between Evaporator Discharge Air Temperature Sensor C296-1, Circuit VH406 (VT/BN) And C296-2, Circuit RH111 (GY/BU)
      G07440144Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.7 and 5.1 volts? 
    • Yes:  INSTALL a new evaporator discharge air temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If code returns, GO to  H7.
    • No: For DTC B1B71:15  , GO to H3  .

      For DTC B1B71:11  , GO to  H5.

  3. H3 CHECK CIRCUIT VH406 (VT/BN) FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: HVAC Module C2356A.
    • Measure the resistance between HVAC module C2356A-6, circuit VH406 (VT/BN), harness side and evaporator discharge air temperature sensor C296-1, circuit VH406 (VT/BN), harness side.
      Fig 3: Checking Circuit VH406 (VT/BN) For Open
      G07440145Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to H4  .
    • No:  REPAIR circuit VH406 (VT/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. H4 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN 
    • Measure the resistance between HVAC module C2356A-10, circuit RH111 (GY/BU), harness side and evaporator discharge air temperature sensor C296-2, circuit RH111 (GY/BU), harness side.
      Fig 4: Checking Circuit RH111 (GY/BU) For Open
      G07440146Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  H7.
    • No:  REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. H5 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO CIRCUIT RH111 (GY/BU) 
    • Ignition OFF.
    • Disconnect: HVAC Module C2356A.
    • Measure the resistance between evaporator discharge air temperature sensor C296-1, circuit VH406 (VT/BN), harness side and C296-2, circuit RH111 (GY/BU), harness side.
      Fig 5: Checking Circuit VH406 (VT/BN) For Short To Circuit RH111 (GY/BU)
      G07440147Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to H6  .
    • 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.
  6. H6 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO GROUND 
    • Measure the resistance between HVAC module C2356A-6, circuit VH406 (VT/BN), harness side and ground.
      Fig 6: Measuring Resistance Between HVAC Module C2356A-6, Circuit VH406 (VT/BN) And Ground
      G07440148Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to H7  .
    • No:  REPAIR circuit VH406 (VT/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  7. H7 CHECK THE HVAC MODULE CONNECTION 
    • Inspect the HVAC 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 CLIMATE CONTROL article. 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.
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