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PINPOINT TEST E: DTCs B1A68:11 AND B1A68:15

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  1. E1 CHECK THE SENSOR RESISTANCE 
    • Ignition OFF.
    • Disconnect: Ambient Air Temperature Sensor C132.
    • Measure the resistance between the ambient air temperature sensor C132 terminals and compare to the table below.
      Ambient Temperature Resistance
      -40°C (-40°F) 832, 519-1, 017, 523 ohms
      -15°C (5°F) 199, 325-220, 307 ohms
      0°C (32°F) 91, 058-100, 644 ohms
      15°C (59°F) 44, 435-49, 113 ohms
      25°C (77°F) 28, 500-31, 500 ohms
      35°C (95°F) 18, 730-20, 701 ohms
      60°C (140°F) 7, 171-7, 925 ohms
      85°C (185°F) 3, 110-3, 438 ohms
      Fig 1: Measuring Resistance Between Ambient Air Temperature Sensor C132 Terminals
      G06064533Courtesy of FORD MOTOR CO.
    • Is the resistance within the specified values for the temperatures? 
    • Yes  : GO to E2.
    • No  : INSTALL a new ambient air temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  2. E2 CHECK THE SENSOR OUTPUT VOLTAGE 
    • Ignition ON.
    • Measure the voltage between ambient air temperature sensor C132-1, circuit VH407 (YE/GN), harness side and C132-2, circuit RH111 (GY/BU), harness side.
      Fig 2: Measuring Voltage Between Ambient Air Temperature Sensor C132-1 And C132-2
      G06064534Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.7 and 5.1 volts? 
    • Yes  : INSTALL a new ambient air temperature sensor. CLEAR the DTCs. REPEAT the self-test. If code returns, GO to  E8.
    • No  : For DTC B1A61:15  , GO to E3.

      For DTC B1A61:11  , GO to  E6.

  3. E3 CHECK CIRCUIT VH407 (YE/GN) FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: HVAC Module C294A.
    • Ignition ON.
    • Measure the voltage between HVAC module C294A-12, circuit VH407 (YE/GN), harness side and ground.
      Fig 3: Measuring Voltage Between HVAC Module C294A-12, Circuit VH407 (YE/GN)
      G06283685Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR circuit VH407 (YE/GN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
    • No  : GO to E4.
  4. E4 CHECK CIRCUIT VH407 (YE/GN) FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between HVAC module C294A-12, circuit VH407 (YE/GN), harness side and ambient air temperature sensor C132-1, circuit VH407 (YE/GN), harness side.
      Fig 4: Checking Circuit VH407 (YE/GN) For Open
      G06257729Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to E5.
    • No  : REPAIR circuit VH407 (YE/GN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. E5 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN 
    • Measure the resistance between HVAC module C294A-4, circuit RH111 (GY/BU), harness side and ambient air temperature sensor C132-2, circuit RH111 (GY/BU), harness side.
      Fig 5: Checking Circuit RH111 (GY/BU) For Open
      G06257730Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  E8.
    • No  : REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. E6 CHECK CIRCUIT VH407 (YE/GN) FOR A SHORT TO CIRCUIT RH111 (GY/BU) 
    • Ignition OFF.
    • Disconnect: HVAC Module C294A.
    • Measure the resistance between ambient air temperature sensor C132-1, circuit VH407 (YE/GN), harness side and C132-2, circuit RH111 (GY/BU), harness side.
      Fig 6: Checking Circuit VH407 (YE/GN) For Short To Circuit RH111 (GY/BU)
      G06075220Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to E7.
    • No  : REPAIR circuit VH407 (YE/GN) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  7. E7 CHECK CIRCUIT VH407 (YE/GN) FOR A SHORT TO GROUND 
    • Measure the resistance between HVAC module C294A-12, circuit VH407 (YE/GN), harness side and ground.
      Fig 7: Checking Circuit VH407 (YE/GN) For Short To Ground
      G06257732Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to E8.
    • No  : REPAIR circuit VH407 (YE/GN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  8. E8 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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