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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 892 (Instrument Cluster System) >> Diagnostic Tests >> Instrument Cluster (IC) >> Pinpoint Tests >> Pinpoint Test X: The Outside Air Temperature Display Is Inoperative/Inaccurate >> Pinpoint Test X: The Outside Air Temperature Display Is Inoperative/Inaccurate

Pinpoint Test X: The Outside Air Temperature Display Is Inoperative/Inaccurate

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. X1 RETRIEVE AND RECORD THE DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER SELF-TESTS 
    • Check for recorded instrument cluster DTCs from the continuous and on-demand self-tests.
    • Are DTCs B1255 or B1257 retrieved? 
    1. YES  : Go to  X2 .
    2. NO  : If the outside air temperature display is inoperative, go to  X6.

      If the outside air temperature display is inaccurate, INSTALL a new ambient air temperature sensor. TEST the system for normal operation.

  2. X2 VERIFY THE SPEEDOMETER OPERATION 
    • Operate the vehicle and verify the speedometer operation.
    • Does the speedometer operate correctly? 
    1. YES  : Go to  X3.
    2. NO  : Go to Pinpoint Test F .
  3. X3 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 pin 1, component side and the ambient air temperature sensor C132 pin 2, component side at ambient temperature of 18°-29°C (65°-85°F).
      • Fig 1: Checking Ambient Air Temperature Sensor Function
      GF0004469Courtesy of FORD MOTOR CO.
    • Is the resistance between 8,000 ohms and 14,000 ohms? 
    1. YES  : Go to  X4.
    2. NO  : INSTALL a new ambient air temperature sensor. CLEAR the DTCs. REPEAT the self-test.
  4. X4 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
      GF0004470Courtesy 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? 
    1. YES  : Go to  X5.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. X5 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
      GF0004471Courtesy 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? 
    1. YES  : Go to  X6.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  6. X6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • damaged pins
      • 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? 
    1. YES  : INSTALL a new instrument cluster. REFER to Instrument Cluster (IC)  in this article. TEST the system for normal operation.
    2. 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.
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