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PINPOINT TEST E: DTCs B1A68:11 AND 15

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  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 chart 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: Checking Ambient Air Temperature Sensor Resistance
      G07787122Courtesy 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, Circuit VH407 (YE/GN) And C132-2, Circuit RH111 (GY/BU)
      G07787123Courtesy 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 - Electronic Manual Temperature Control (EMTC) C2357a.
    • Disconnect: HVAC Module - Dual Automatic Temperature Control (DATC) C2356a.
    • Ignition ON.
    • Measure the voltage between HVAC module - DATC C2356a-2, circuit VH407 (YE/GN), harness side and ground.
      Fig 3: Measuring Voltage Between HVAC Module - DATC C2356A-2, Circuit VH407 (YE/GN) And Ground
      G07787124Courtesy 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 - DATC C2356a-2, 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
      G07787125Courtesy 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 - DATC C2356a-10, 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
      G07787126Courtesy 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 - EMTC C2357a.
    • Disconnect: HVAC Module - DATC C2356a.
    • 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: Measuring Resistance Between Ambient Air Temperature Sensor C132-1, Circuit VH407 (YE/GN) And C132-2, Circuit RH111 (GY/BU)
      G07787127Courtesy 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 - DATC C2356a-2, circuit VH407 (YE/GN), harness side and ground.
      Fig 7: Measuring Resistance Between HVAC Module - DATC C2356A-2, Circuit VH407 (YE/GN) And Ground
      G07787128Courtesy 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 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 CLIMATE CONTROL -- FUSION, MILAN & MKZ 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. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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