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PINPOINT TEST G: DTCs B1B71:11 AND B1B71:15

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  1. G1 CHECK THE SENSOR RESISTANCE 
    • Ignition OFF.
    • Disconnect: Evaporator Discharge Air Temperature Sensor C296.
    • Measure the resistance between the evaporator discharge air temperature sensor C296 terminals and compare to the table below.
      Ambient Temperature Resistance
      -40°C (-40°F) 1, 005, 00-1, 104, 000 ohms
      -20°C (-4°F) 287, 811-307, 800 ohms
      0°C (32°F) 96, 890-101, 300 ohms
      20°C (68°F) 37, 080-38, 000 ohms
      25°C (77°F) 29, 700-30, 300 ohms
      30°C (86°F) 23, 840-24, 430 ohms
      35°C (95°F) 19, 260-19, 820 ohms
      40°C (104°F) 15, 660-16, 180 ohms
      60°C (140°F) 7, 239-7, 594 ohms
      100°C (212°F) 1, 943-2, 091 ohms
      Fig 1: Measuring Resistance Between Evaporator Discharge Air Temperature Sensor C296 Terminals
      G06064669Courtesy of FORD MOTOR CO.
    • Is the resistance within the specified values for the temperatures? 
    • Yes  : GO to G2.
    • No  : INSTALL an evaporator discharge air temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. G2 CHECK THE SENSOR OUTPUT VOLTAGE 
    • Ignition ON.
    • Press the AUTO button.
    • Measure the voltage between evaporator discharge air temperature sensor C296-2, circuit VH406 (VT/BN), harness side and C296-1, circuit RH111 (GY/BU), harness side.
      Fig 2: Checking Sensor Output Voltage
      G06403359Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.7 and 5.1 volts? 
    • Yes  : GO to  G8.
    • No  : For DTC B1B71:15  , GO to G3.

      For DTC B1B71:11  , GO to  G6.

  3. G3 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: HVAC Module C294A.
    • Ignition ON.
    • Measure the voltage between ground and HVAC module C294A-8, circuit VH406 (VT/BN), harness side and ground.
      Fig 3: Measuring Voltage Between Ground And HVAC Module C294A-8, Circuit VH406 (VT/BN)
      G06257741Courtesy 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 G4.
  4. G4 CHECK CIRCUIT VH406 (VT/BN) FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between HVAC module C294A-8, circuit VH406 (VT/BN), harness side and evaporator discharge air temperature sensor C296-2, circuit VH406 (VT/BN), harness side.
      Fig 4: Checking Circuit VH406 (VT/BN) For Open
      G06403361Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to G5.
    • No  : REPAIR circuit VH406 (VT/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. G5 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN 
    • Measure the resistance between HVAC module C294A-4, circuit RH111 (GY/BU), harness side and evaporator discharge air temperature sensor C296-1, circuit RH111 (GY/BU), harness side.
      Fig 5: Checking Circuit RH111 (GY/BU) For Open
      G06403362Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  G8.
    • No  : REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. G6 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO CIRCUIT RH111 (GY/BU) 
    • Ignition OFF.
    • Disconnect: HVAC Module C294A.
    • Measure the resistance between evaporator discharge air temperature sensor C296-2, circuit VH406 (VT/BN), harness side and C296-1, circuit RH111 (GY/BU), harness side.
      Fig 6: Checking Circuit VH406 (VT/BN) For Short To Circuit RH111 (GY/BU)
      G06257744Courtesy 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 circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  7. G7 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO GROUND 
    • Measure the resistance between HVAC module C294A-8, circuit VH406 (VT/BN), harness side and ground.
      Fig 7: Measuring Resistance Between HVAC Module C294A-8, Circuit VH406 (VT/BN)
      G06403364Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to G8.
    • No  : REPAIR circuit VH406 (VT/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  8. G8 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 . 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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