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PINPOINT TEST D: DTCs B1A61:11 AND 15

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  1. D1 CHECK THE IN-VEHICLE TEMPERATURE SENSOR RESISTANCE 
    • Ignition OFF.
    • Disconnect: In-Vehicle Temperature Sensor C233.
    • Measure the resistance between the in-vehicle temperature sensor C233 terminals, component side and compare to the table below.
      Ambient Temperature Resistance
      -40°C (-40°F) 862, 600-942, 000 ohms
      -15°C (5°F) 202, 400-214, 700 ohms
      0°C (32°F) 93, 510-97, 640 ohms
      15°C (59°F) 46, 080-47, 430 ohms
      25°C (77°F) 29, 700-30, 300 ohms
      35°C (95°F) 19, 400-20, 000 ohms
      60°C (140°F) 7, 414-7, 774 ohms
      85°C (185°F) 3, 182-3, 393 ohms
      Fig 1: Measuring Resistance Between In-Vehicle Temperature Sensor C233 Terminals, Component Side
      G07484436Courtesy of FORD MOTOR CO.
    • Is the resistance within the specified values for the temperatures? 
    • Yes  : GO to D2.
    • No  : INSTALL a new in-vehicle temperature sensor. REFER to CLIMATE CONTROL . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. D2 CHECK THE HVAC MODULE OUTPUT VOLTAGE 
    • Ignition ON.
    • Measure the voltage between in-vehicle temperature sensor C233-2, circuit VH414 (GN/BU), harness side and C233-1, circuit RH111 (GY/BU), harness side.
      Fig 2: Measuring Voltage Between In-Vehicle Temperature Sensor C233-2, Circuit VH414 (GN/BU) And C233-1, Circuit RH111 (GY/BU)
      G07484437Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.7 and 5.1 volts? 
    • Yes  : INSTALL a new in-vehicle temperature sensor. REFER to CLIMATE CONTROL . CLEAR the DTCs. REPEAT the self-test. If the DTC returns, GO to  D8.
    • No  : For DTC B1A61:15  , GO to D3.

      For DTC B1A61:11  , GO to  D6.

  3. D3 CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: HVAC Module C228.
    • Ignition ON.
    • Measure the voltage between ground and HVAC module C228-26, circuit VH414 (GN/BU), harness side.
      Fig 3: Measuring Voltage Between Ground And HVAC Module C228-26, Circuit VH414 (GN/BU), Harness Side
      G07484438Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR circuit VH414 (GN/BU) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No  : GO to D4.
  4. D4 CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between HVAC module C228-26, circuit VH414 (GN/BU), harness side and in-vehicle temperature sensor C233-2, circuit VH414 (GN/BU), harness side.
      Fig 4: Measuring Resistance Between HVAC Module C228-26, Circuit VH414 (GN/BU) And In-Vehicle Temperature Sensor C233-2, Circuit VH414 (GN/BU)
      G07484439Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to D5.
    • No  : REPAIR circuit VH414 (GN/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. D5 CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN 
    • Measure the resistance between HVAC module C228-23, circuit RH111 (GY/BU), harness side and in-vehicle temperature sensor C233-1, circuit RH111 (GY/BU), harness side.
      Fig 5: Measuring Resistance Between HVAC Module C228-23, Circuit RH111 (GY/BU) And In-Vehicle Temperature Sensor C233-1, Circuit RH111 (GY/BU)
      G07484440Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to D8.
    • No  : REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. D6 CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO THE SIGNAL RETURN CIRCUIT 
    • Ignition OFF.
    • Disconnect: HVAC Module C228.
    • Measure the resistance between in-vehicle temperature sensor C233-2, circuit VH414 (GN/BU), harness side and C233-1, circuit RH111 (GY/BU), harness side.
      Fig 6: Measuring Resistance Between In-Vehicle Temperature Sensor C233-2, Circuit VH414 (GN/BU) And C233-1, Circuit RH111 (GY/BU)
      G06064531Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to D7.
    • No  : REPAIR circuit VH414 (GN/BU) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  7. D7 CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between HVAC module C228-26, circuit VH414 (GN/BU), harness side and ground.
      Fig 7: Measuring Resistance Between HVAC Module C228-26, Circuit VH414 (GN/BU), Harness Side And Ground
      G07484442Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to D8.
    • No  : REPAIR circuit VH414 (GN/BU) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  8. D8 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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