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PINPOINT TEST E: DTCs B1A68:11 AND 15

WARNING: This page is about a different variant/trim than selected.
  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 TABLE

      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
      G07440124Courtesy 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)
      G07440125Courtesy 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, Circuit VH407 (YE/GN) And Ground
      G07440126Courtesy 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, Circuit VH407 (YE/GN) And Ambient Air Temperature Sensor C132-1, Circuit VH407 (YE/GN)
      G07440127Courtesy 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 Open
      G07440128Courtesy 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: Checking Circuit VH407 (YE/GN) For Short To Circuit RH111 (GY/BU)
      G07440129Courtesy 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, Circuit VH407 (YE/GN) And Ground
      G07440130Courtesy 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 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.
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