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Pinpoint Test U: The Integrated Circuit Display Is Inoperative

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. U1 RETRIEVE AND RECORD THE INSTRUMENT CLUSTER DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND SELF-TESTS 
    • Check for the recorded PCM DTCs from the continuous and on-demand self-tests.
    • Are DTCs B1255, B1257, or B2143 retrieved? 
    • Yes  : If DTC B1255 or B1257 is present, GO to  U3.

      If DTC B2143 is present, GO to  U6.

    • No  : If the compass is inoperative, REFER to INFORMATION AND MESSAGE CENTER to continue diagnosis of the compass.

      If the compass operates correctly, GO to U2.

  2. U2 VERIFY THE SPEEDOMETER OPERATION 
    • Operate the vehicle and verify the speedometer operation.
    • Does the speedometer operate correctly? 
  3. U3 CHECK THE AMBIENT AIR TEMPERATURE SENSOR FUNCTION 
    • Key in OFF position.
    • Disconnect: Ambient Air Temperature Sensor C132.
    • Measure the resistance between the ambient air temperature sensor C132-1, component side and the ambient air temperature sensor C132-2, component side at ambient temperature of 18°-29°C (65°-85°F).
      Fig 1: Checking Ambient Air Temperature Sensor Function
      G03965467Courtesy of FORD MOTOR CO.
    • Is the resistance between 8,000 ohms and 14,000 ohms? 
    • Yes  : GO to  U4.
    • No  : INSTALL a new ambient air temperature sensor. CLEAR the DTCs. REPEAT the self-test.
  4. U4 CHECK CIRCUIT 767 (LB/OG) FOR AN OPEN AND A SHORT TO GROUND 
    • Disconnect: Instrument Cluster C220a.
    • Measure the resistance between the instrument cluster C220a-13, circuit 767 (LB/OG), harness side and the ambient air temperature sensor C132-1, circuit 767 (LB/OG), harness side; and between the instrument cluster C220a-13, circuit 767 (LB/OG), harness side and ground.
      Fig 2: Checking Circuit 767 (LB/OG) For An Open And Short To Ground
      G03965468Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the instrument cluster and the ambient air temperature sensor, and greater than 10,000 ohms between the instrument cluster and ground? 
    • Yes  : GO to  U5.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. U5 CHECK CIRCUIT 242 (DG) FOR AN OPEN AND A SHORT TO GROUND 
    • Measure the resistance between the instrument cluster C220a-14, circuit 242 (DG), harness side and the ambient air temperature sensor C132-2, circuit 242 (DG), harness side; and between the instrument cluster C220a-14, circuit 242 (DG), harness side and ground.
      Fig 3: Checking Circuit 242 (DG) For An Open And Short To Ground
      G03965469Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the instrument cluster and the ambient air temperature sensor, and greater than 10,000 ohms between the instrument cluster and ground? 
    • Yes  : GO to  U5.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  6. U6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all the instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . CLEAR the DTCs. REPEAT the self-test.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
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