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Home >> Ford >> 2023 >> F-150 Limited >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Fuel Charging And Controls - Turbocharger - 3.5L V6 POWERBOOST (CN) >> Diagnosis And Testing >> Turbocharger >> Pinpoint Tests >> Pinpoint Test C: Loss Of Power

Pinpoint Test C: Loss Of Power

  1. Possible Sources 

    • Air cleaner
    • Air intake
    • Exhaust restricted
    • Turbocharger
    • Internal engine damage

  2. C1 CHECK FOR PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition ON.

    • Carry out the PCMKOEO and KOER self-tests.

    Are any Diagnostic Trouble Codes (DTCs) present? 

    Yes  REFER to the appropriate DTC Chart to diagnose the DTC present.
    No  GO to  C2

  3. C2 CHECK THE AIR CLEANER

    • Inspect the air cleaner.

    Is the air cleaner clogged? 

    Yes  REPLACE the air cleaner. Refer to INTAKE AIR FLOW or INTAKE AIR PRESSURE AND TEMPERATURE Check the system for normal operation.
    No  GO to  C3

  4. C3 CHECK THE AIR INTAKE SYSTEM

    • Check the air intake system, air cleaner and CAC components, ducts, pipes and hoses. Check that all components are installed correctly and tight. Check that all components are aligned correctly. Check for damage that could cause an air-intake leak resulting in a noise from the turbocharger(s). For additional information, refer to INTAKE AIR FLOW or INTAKE AIR PRESSURE AND TEMPERATURE for the engine being diagnosed.

    Does the air intake system have any leaks? 

    Yes  Repair as necessary. Refer to INTAKE AIR FLOW or INTAKE AIR PRESSURE AND TEMPERATURE for the engine being diagnosed.
    No  GO to  C4

  5. C4 CHECK THE EXHAUST SYSTEM

    • Check the exhaust system for restrictions or damage. Refer to the EXHAUST SYSTEM for the engine being diagnosed.

    Is the exhaust system restricted or damaged? 

    Yes  REPAIR as necessary. Refer to the EXHAUST SYSTEM for the engine being diagnosed.
    No  GO to  C5

  6. C5 CHECK THE WASTEGATE

    • Check the wastegate for damage. Check to be sure the wastegate linkage moves freely.

    Is the wastegate, wastegate actuator or linkage damaged? 

    Yes  REPAIR as necessary. Refer to appropriate information for the engine being diagnosed.
    No  GO to  C6

  7. C6 CHECK THE TURBOCHARGER

    • Remove the air cleaner outlet pipe and CAC intake pipe.

    • Inspect the compressor wheel for damage.

    • Check that the turbine shaft spins free.

    • Check for contact marks between the compressor wheel and the housing.

    Is the turbocharger damaged? 

    Yes  INSTALL a new turbocharger.
    No  Diagnose internal engine damage. REFER to ENGINE - GASOLINE to diagnose loss of power, poor idling, runs rough.
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