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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Pinpoint Tests (Diesel)) >> Pinpoint Tests AW: Intake Air Temperature (IAT)/Ambient Air Temperature (AAT) Sensor Correlation >> Test Procedure

Test Procedure

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. AW1 PRELIMINARY DIAGNOSIS 

    Is DTC P009A present? 

    Yes No
    GO to  AW2. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  2. AW2 DTC P009A: CHECK THE SENSOR FOR BIAS 
    • Ignition OFF.
    • Cold soak the vehicle overnight.
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the IAT11 (TEMP) and AAT (TEMP) PIDs.

    Are both temperature readings within 20°C (36°F) of ambient temperature? 

    Yes No
    GO to  AW3. INSTALL a new sensor for the one that is not within range.
    REFER to the appropriate Electronic Engine Controls article.
    Clear the PCM DTCs. REPEAT the self-test.
  3. AW3 CHECK KOER IAT AND AAT VALUES 
    NOTE: Strict observance of posted speed limits and attention to driving conditions are mandatory when carrying out the road test. Failure to follow these instructions may result in personal injury.
    • Ignition ON, engine running.
    • Run the engine until it reaches normal operating temperature.
    • Access the PCM and monitor the IAT11 (TEMP) and AAT (TEMP) PIDs.
    • Drive the vehicle at a minimum speed of 80.5 km/h (50 mph), while monitoring the IAT and AAT PIDs.
    • Record the PID values.

    Are the sensor values within 20°C (36°F) of each other? 

    Yes No
    Unable to duplicate the concern. Cold soak the vehicle overnight and REPEAT the self-test. If no concern is present,
    GO to  AW4.    		 INSTALL a new sensor for the one that is not within range. REFER to the appropriate Electronic Engine Controls article.
    Clear the PCM DTCs. REPEAT the self-test.
  4. AW4 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) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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