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HOMESERVICE MANUALSFORD2014MUSTANG GT, 2D COUPE, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - PINPOINT TEST H: FUEL CONTROL THROUGH PINPOINT TEST JD: CRANKSHAFT POSITION (CKP) SENSOR - (EXCEPT DIESEL & HYBRID)PINPOINT TEST H: FUEL CONTROLTEST PROCEDURE
2014 Ford Mustang GT, 2D Coupe, Automatic Trans

Test Procedure

2014 Ford Mustang GT, 2D Coupe, Automatic TransSECTION Test Procedure
  1. H1 CHECK FOR DTCS 

    Are DTCs P0171, P0172, P0174, P0175, P2195, P2196, P2197, P2198, P219A, P219B, P2270, P2271, P2272 or P2273 present? 

    Yes No
    For DTCs P2270, P2271, P2272 or P2273, GO to  H3.
    For all others, GO to H2  .    		 RETURN to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for further direction.
  2. H2 RICH OR LEAN SYSTEM DTCS 
    NOTE: Do not clear the DTCs or reset the keep alive memory (KAM).
    • Access the PCM and record the engine coolant temperature (ECT) PID from the freeze frame data. The freeze frame data is used to recreate the concern.
    • Carry out the PCM self-test.

    Are any DTCs present other than the following: P0171, P0172, P0174, P0175, P2195, P2196, P2197, P2198, P219A, or P219B? 

    Yes No
    DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS . GO to H3  .
  3. H3 CARRY OUT A VISUAL INSPECTION 
    • Ignition OFF.
    • Check the air filter element and housing for blockage.
    • Inspect the entire air intake system from the mass airflow (MAF) sensor to the intake manifold for leaks such as:
      • hoses connecting to the MAF sensor assembly
      • cracked or punctured intake air tube
      • loose connections on the intake air tube at the air cleaner housing or throttle body
      • hoses connecting to the throttle body
      • obstructions, restrictions, or damage
    • Check the throttle plate for obstructions or sludge.
    • Inspect the entire length of all the vacuum hoses for:
      • correct connections
      • damage or cracks
      • damaged or cracked vacuum tees
    • Inspect the intake manifold or gasket for leaks.
    • Inspect the exhaust gas recirculation (EGR) system for leaks such as:
      • EGR valve gasket leak to intake manifold
      • EGR valve diaphragm or control solenoid
    • Verify the integrity of the positive crankcase ventilation (PCV) system.
    • Verify the proper PCV valve part number, (if equipped).
    • Inspect the exhaust system for leaks at flanges and gaskets.
    • Visually inspect the HO2S for:
      • pinched, shorted, and corroded wiring and pins
      • oil or water contamination
      • crossed sensor wires
    • Inspect for an incorrectly seated engine oil dipstick, dipstick tube, or oil fill cap.

    Is a concern present? 

    Yes No
    For vacuum leak concerns, GO to  H9.
    For all others, REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to H4  .
  4. H4 CARRY OUT THE RELATIVE INJECTOR FLOW TEST 
    NOTE: The IDS test referenced in this step may not be available on all vehicles. Follow the YES answer if the IDS test is not available.
    • Ignition OFF.
    • Carry out the Relative Injector Flow Test. Refer to the instruction manual provided by the scan tool manufacturer.

    Does the test pass? 

    Yes No
    For DTCs P2270, P2271, P2272 or P2273, GO to  H24.
    For all others, GO to H5  .    		 INSTALL a new Fuel Injector. REFER to the appropriate Fuel Charging and Controls article. RESET the keep alive memory (KAM). REFER to RESETTING THE KEEP ALIVE MEMORY (KAM) . REPEAT the self-test.
  5. H5 CHECK THE EVAP SYSTEM FOR A STUCK OPEN EVAP PURGE VALVE 
    • Ignition ON, engine running.
    • Access the PCM and monitor the FTP (PRESS) PID.
    • Access the PCM and control the EVAPCP (PER) PID.
    • Close the EVAP purge valve by commanding the EVAPCP PID to 0%.
    • Access the PCM and control the EVAPCV (MODE) PID.
    • Close the EVAP canister vent valve by commanding the EVAPCV PID to ON (100% duty cycle).

    Does the FTP PID decrease, the engine RPM change, or the engine stall, as an indication that the EVAP purge valve is stuck open? 

    Yes No
    INSTALL a new Evaporative Emission (EVAP) Purge valve. REFER to the applicable service information article, Evaporative Emissions,
    Clear the PCM DTCs. REPEAT the self-test.    		 For DTCs P0172, P0175, P219A or P219B, GO to  H11.
    For DTCs P2196 or P2198, GO to  H10.
    For all others, GO to H6  .
  6. H6 CHECK FOR THE PRESENCE OF A VACUUM LEAK 
    NOTE: Fuel trim values at idle are more sensitive to a vacuum leak. The vacuum leak (unmetered air) represents a larger portion of the total airflow at idle than at part throttle.
RENDER: 1.0x

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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.