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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 315 (Engine Controls - Pinpoint Test A: No Start Through Pinpoint Test DN: Pressure And Temperature Sensors - (Except Diesel & Hybrid)) >> Pinpoint Test DA: Intake Air Temperature (IAT) Sensor >> Test Procedure

Test Procedure

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  1. DA1 PRELIMINARY DIAGNOSIS 

    Are DTCs P009A, P0111, P0112, P0113, P0114, or P1112 present? 

    Yes No
    For DTCs P009A, P0111, P0112, P0113, P0114 or P1112, GO to DA2  .
    For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .    		 For symptoms without DTCs, GO to DA2  .
  2. DA2 CHECK FOR AN OPEN 
    NOTE: Only measure the circuits that apply to the vehicle being diagnosed.
    • Ignition OFF.
    • IAT Sensor connector disconnected.
    • PCM connector disconnected.
    • Measure the resistance between:
      (+) IAT Sensor Connector, Harness Side (-) PCM Connector, Harness Side
      IAT IAT
    • For Motorhome / Stripped Chassis / Step Van,
    • Measure the resistance between:
      (+) IAT Sensor Connector, Harness Side (-)
      GND Ground
    • For all others,
    • Measure the resistance between:
      (+) IAT Sensor Connector, Harness Side (-) PCM Connector, Harness Side
      SIGRTN SIGRTN

    Are the resistances less than 5 ohms? 

    Yes No
    GO to DA3  . REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  3. DA3 CHECK FOR A SHORT TO GROUND 
    • Measure the resistance between:
      (+) IAT Sensor Connector, Harness Side (-)
      IAT Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to DA4  . REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.
  4. DA4 CHECK FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) IAT Sensor Connector, Harness Side (-)
      IAT Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. GO to DA5  .
  5. DA5 INTERMITTENT CHECK 
    • Ignition OFF.
    • PCM connector connected.
    • IAT Sensor connector connected.
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the IAT (VOLT) PID.
    • While observing the PID, wiggle, shake, and bend small sections of the wiring harness working from the sensor to the PCM.
    • Lightly tap on the IAT sensor and wiggle the harness connector to simulate road shock.

    Does the IAT PID reading change? 

    Yes No
    REPAIR as necessary or INSTALL a new IAT sensor. REFER to the appropriate Electronic Engine Controls article. RESET the keep alive memory (KAM). REFER to RESETTING THE KEEP ALIVE MEMORY (KAM) .
    REPEAT the self-test.    		 GO to DA6  .
  6. DA6 CHECK THE IAT CIRCUIT VOLTAGE CYCLING INTEGRITY 
    • Ignition OFF.
    • IAT Sensor connector disconnected.
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the IAT (VOLT) PID.
    • Record the IAT PID value.
    • Connect a 5 amp fused jumper wire between the following:
      Point A IAT Sensor Connector, Harness Side Point B
      IAT Ground
    • Record the IAT PID value.

    Does the IAT PID change from greater than 3.0 volts to less than 0.20 volt when the jumper is connected? 

    Yes No
    INSTALL a new IAT sensor. REFER to the appropriate Electronic Engine Controls article. RESET the keep alive memory (KAM). REFER to RESETTING THE KEEP ALIVE MEMORY (KAM) .
    REPEAT the self-test.    		 GO to DA7  .
  7. DA7 INTAKE AIR TEMPERATURE (IAT) SENSOR AMBIENT AIR TEMPERATURE (AAT) SENSOR CORRELATION 
    NOTE: Check temperature values while engine is at ambient temperature, cold soak the engine for a minimum of 8 hours while not in direct sunlight, if necessary.
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the IAT (TEMP) PID.
    • For Fiesta,
    • Access the PCM and monitor the OUTDR_TMP (TEMP) PID.
    • For all others,
    • Access the PCM and monitor the AAT (TEMP) PID.

    Are the temperature readings within 18°C (32.4°F) of each other? 

    Yes No
    GO to DA8  . INSTALL a new IAT sensor. REFER to the appropriate Electronic Engine Controls article. RESET the keep alive memory (KAM). REFER to RESETTING THE KEEP ALIVE MEMORY (KAM) .
    REPEAT the self-test.
  8. DA8 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.
    • 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) , Programming the VID Block for a Replacement PCM. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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