Pinpoint Test Y: The Integrated Circuit Display Is Inoperative

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

Y1 RETRIEVE THE RECORDED INSTRUMENT CLUSTER DTCS FROM BOTH THE CONTINUOUS AND ON-DEMAND SELF-TESTS
- Check for recorded instrument cluster DTCs from the continuous and on-demand self-tests.
- Are any DTCs retrieved?
- Yes : If DTC B1255 or B1257, GO to Y4.
  All other instrument cluster DTCs, REFER to the INSTRUMENT CLUSTER DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
- No : GO to Y2.
Y2 VERIFY THE INTEGRATED CIRCUIT DISPLAY OPERATION
- Key in ON position.
- Monitor the air temperature, and odometer/trip odometer functions of the integrated circuit display.
- Does the integrated circuit display operate correctly?
- Yes : The system is operating correctly at this time.
- No : If the odometer/trip odometer are inoperative, GO to Y3.
  If the air temperature display is inoperative, GO to Y4.
  
  If the odometer/trip odometer and the air temperature display are inoperative, GO to Y7.
Y3 VERIFY THE SPEEDOMETER OPERATION
- Operate the vehicle and verify the speedometer operation.
- Does the speedometer operate correctly?
- Yes : GO to Y7.
- No : GO to PINPOINT TEST F .
Y4 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, circuit 234 (DB/WH), component side and the ambient air temperature sensor C132-2, circuit 233 (DB/YE), component side at an ambient temperature of 18°-29°C (65°-85°F).
  
  Fig 1: Measuring Resistance Between Ambient Air Temperature Sensor C132-1 And Ambient Air Temperature Sensor C132-2
  Courtesy of FORD MOTOR CO.
- Is the resistance between 8,000 ohms and 14,000 ohms?
- Yes : GO to Y5.
- No : INSTALL a new ambient air temperature sensor. TEST the system for normal operation.
Y5 CHECK CIRCUIT 233 (DB/YE) FOR AN OPEN OR A SHORT TO GROUND
- Disconnect: Instrument Cluster C220b.
- Measure the resistance between the instrument cluster C220b14, circuit 233 (DB/YE), harness side and the ambient air temperature sensor C132-2, circuit 233 (DB/YE), harness side; and between the instrument cluster C220b-14, circuit 233 (DB/YE), harness side and ground.
  
  Fig 2: Checking Circuit 233 (DB/YE) For An Open Or A Short To Ground
  Courtesy 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 Y6.
- No : REPAIR the circuit. TEST the system for normal operation.
Y6 CHECK CIRCUIT 234 (DB/WH) FOR AN OPEN OR A SHORT TO GROUND
- Measure the resistance between the instrument cluster C220b-19, circuit 234 (DB/WH), harness side and the ambient air temperature sensor C132-1, circuit 234 (DB/WH), harness side; and between the instrument cluster C220b-19, circuit 234 (DB/WH), harness side and ground.
  
  Fig 3: Checking Circuit 234 (DB/WH) For An Open Or A Short To Ground
  Courtesy 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 Y7.
- No : REPAIR the circuit. TEST the system for normal operation.
Y7 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 . 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.