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HOMESERVICE MANUALSFORD2005GTREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1654 (ENGINE CONTROLS - PINPOINT TEST HE: EXHAUST GAS RECIRCULATION (EGR) SYSTEMS THROUGH PINPOINT TEST HZ: NATURAL VACUUM LEAK DETECTION - (EXCEPT DIESEL & HYBRID))PINPOINT TEST HU: INTAKE AIR SYSTEMSTEST PROCEDURE
2005 Ford GT

Test Procedure

2005 Ford GTSECTION Test Procedure
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.
  1. HU1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) 

    Are DTCs P0505, P0506, P0660, P0663, P2004, P2005, P2006, P2007, P2008, P2014, P2015, P2020, P2070, or P2071 present? 

    Yes No
    For DTCs P0505 or P0506, on vehicles with electronic throttle control (ETC),
    GO to  HU40.
    For DTCs P0505 or P0506, on vehicles without ETC,
    GO to  HU2.
    For DTCs P0660, P0663, P2070 or P2071, GO to  HU31.
    For DTCs P2004, P2005, P2006, P2007, P2008, P2014, P2015 or P2020, GO to  HU15.    		 For vehicles equipped with electronic throttle control (ETC) that have low idle concerns, difficulty starting, hesitation, loss of RPM, GO to  HU40.
    For lack/loss of power, GO to  HU31.
    For all other symptoms without DTCs, GO to  HU2.
  2. HU2 PART THROTTLE SYMPTOM 

    Are any part throttle concerns present? 

    Yes No
    GO to  HU7. GO to  HU3.
  3. HU3 CHECK THE BASE IDLE SPEED 
    NOTE: The vehicle must be at operating temperature and at idle for a minimum of 1 minute.
    • Ignition ON, engine running.
    • Determine if the idle speed is incorrect. Refer to the REFERENCE VALUES Typical Reference Value Charts, if necessary.
    • Access the PCM and monitor the RPM (RPM) PID.
    • If equipped, read the vehicle tachometer.

    Is vehicle idle speed correct? 

    Yes No
    GO to  HU5. GO to  HU4.
  4. HU4 CHECK THE THROTTLE ARM CONTACTS 
    • Ignition OFF.
    • Check that the throttle arm contacts the return stop.
    • Ignition ON, engine running.

    Is the idle speed high? 

    Yes No
    GO to  HU9. GO to  HU10.
  5. HU5 CHECK FOR BINDING OR STICKING IN THE THROTTLE SYSTEM 
    • Gently cycle the throttle from fully closed to fully open and back to fully closed. Check for sticking or binding during rotation.

    Is a stick and bind condition present? 

    Yes No
    GO to  HU6. GO to  HU7.
  6. HU6 ISOLATE THE BINDING AND/OR STICKING CONCERN 
    NOTE: Do not attempt to clean the throttle bore and plate area. Cleaning damages the throttle body assembly.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.