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PINPOINT TEST E: DTCs B1A68:11 AND 15

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. 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 table below.
      RESISTANCE REFERENCE CHART

      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 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 B1A68:15  , GO to E3  .

      For DTC B1A68:11  , GO to  E6.

  3. E3 CHECK CIRCUIT VH407 (YE/GN) FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: HVAC Module C2356A.
    • Ignition ON.
    • Measure the voltage between HVAC module C2356A-2, circuit VH407 (YE/GN), harness side and ground.
      Fig 3: Measuring Voltage Between HVAC Module C2356A-2 And Ground
      G06064535Courtesy 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 C2356A-2, circuit VH407 (YE/GN), harness side and ambient air temperature sensor C132-1, circuit VH407 (YE/GN), harness side.
      Fig 4: Measuring Resistance Between HVAC Module C2356A-2 And Ambient Temperature Sensor C132-1
      G06064536Courtesy 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 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 An Open
      G06064537Courtesy 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 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 Temperature Sensor C132-1 And C132-2
      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 C2356A-2, circuit VH407 (YE/GN), harness side and ground.
      Fig 7: Measuring Resistance Between HVAC Module C2356A-2 And Ground
      G06064539Courtesy 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 HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE . 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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