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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2805 (Engine Controls - Pinpoint Tests - (Hybrid) - Fault Code Index, Pinpoint Tests A - DN) >> Pinpoint Test DA: Intake Air Temperature (IAT) Sensor >> Test Procedure

Test Procedure

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. DA1 DTCS P0112, P0113 AND P0114: CHECK FOR SELF-TEST DTCS 

    Are any of the following DTCs present during PCM or TCM self-test: P0112, P0113, or P0114? 

    Yes No
    For KOEO and KOER DTC P0112, GO to  DA6.
    For KOEO and KOER DTC P0113, GO to  DA2.
    For all others, GO to  DA8.    		 Unable to duplicate or identify the fault at this time.
    The concern is elsewhere. RETURN to SYMPTOM CHARTS for further direction.
  2. DA2 DTC P0113: CHECK THE IAT SIGNAL CIRCUIT 
    • The DTC indicates the sensor signal is greater than the self-test maximum.
    • MAF/IAT Sensor connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) MAF/IAT Sensor Connector, Harness Side ( - )
      IAT - Pin 1 Ground

    Is the voltage between 4.5 V - 5.5 V? 

    Yes No
    GO to  DA3. GO to  DA4.
  3. DA3 CHECK IAT SENSOR RESISTANCE 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) MAF/IAT Sensor Connector, Component Side ( - ) MAF/IAT Sensor Connector, Component Side
      IAT - Pin 1 SIGRTN - Pin 2

    Is the resistance between 1K ohms - 500K ohms? 

    Yes No
    GO to  DA4. INSTALL a new MAF/IAT sensor.
  4. DA4 CHECK THE SIGNAL AND SIGRTN CIRCUITS FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) MAF/IAT Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
      IAT - Pin 1 IAT - Pin B39
      SIGRTN - Pin 2 SIGRTN - Pin B41

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  DA5. REPAIR the open circuit.
  5. DA5 CHECK THE SIGNAL FOR A SHORT TO POWER IN HARNESS 
    • Key in OFF position.
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) MAF/IAT Sensor Connector, Harness Side ( - )
      IAT - Pin 1 Ground

    Is the voltage greater than 1 V? 

    Yes No
    REPAIR the short circuit. Key in OFF position.
    GO to  DA11.
  6. DA6 DTC P0112: SIMULATE AN OPPOSITE SIGNAL TO THE PCM 
    NOTE: The DTC indicates the sensor signal is less than the self-test minimum.
    • MAF/IAT Sensor connector disconnected.
    • Key ON, engine OFF.
    • Access the PCM and monitor the IAT V PID.

    Is the voltage greater than 4.2 V? 

    Yes No
    Key in OFF position. INSTALL a new MAF/IAT sensor. Key in OFF position.
    GO to  DA7.
  7. DA7 CHECK THE SENSOR SIGNAL FOR A SHORT TO GROUND 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) PCM Connector, Harness Side
      IAT - Pin B39 SIGRTN - Pin B41
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      IAT - Pin B39 Negative terminal
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) PCM Connector, Harness Side
      IAT - Pin B39 MAF RTN - Pin B43

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  DA11. REPAIR the short circuit.
  8. DA8 SELF-TEST DTCS P0112, P0113, P0114 OR P1112: INTERMITTENT CHECK 
    • Key ON, engine OFF.
    • Access the PCM and monitor the IAT V PID.
    • While observing the PID, carry out the following:
      • Tap on the sensor to simulate road shock.
      • Wiggle the sensor connector.

    Is there a large change in the voltage reading? 

    Yes No
    DISCONNECT and INSPECT the connector.
    If OK, INSTALL a new MAF/IAT sensor.    		 GO to  DA9.
  9. DA9 CHECK THE WIRING HARNESS 
    • Access the PCM and monitor the IAT V PID.
    • While observing the PID, wiggle, shake, and bend small sections of the wiring harness working from the sensor to the PCM.

    Is there a large change in the voltage reading? 

    Yes No
    ISOLATE the fault Key in OFF position.
    REPAIR as necessary. GO to  DA10.
  10. DA10 CHECK THE PCM AND VEHICLE HARNESS CONNECTORS 
    • PCM connector disconnected.
    • MAF/IAT Sensor connector disconnected.

    Are the connectors and pins OK? 

    Yes No
    The fault is not present at this time.
    DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .    		 REPAIR as necessary.
  11. DA11 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins.
      • corrosion.
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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