Pinpoint Test C: Loss Of Power
- Possible Causes
- Air cleaner
- Air intake
- Exhaust restricted
- Turbocharger
- Internal engine damage
- C1 CHECK FOR PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, perform the PCM self-tests.
Are any Diagnostic Trouble Codes (DTCs) present?
Yes REFER to the Master DTC Chart to diagnose the DTC. No GO to C2 - C2 CHECK THE AIR CLEANER
- Inspect the air cleaner.
Is the air cleaner clogged?
Yes REPLACE the air cleaner. Refer to the appropriate Service Information for the procedure. CHECK the system for normal operation. No GO to C3 - 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 the Intake Air Distribution and Filtering section for the engine being diagnosed.
Does the air intake system have any leaks?
Yes REPAIR as necessary. REFER to Intake Air Distribution and Filtering for the engine being diagnosed. No GO to C4 - C4 CHECK THE EXHAUST SYSTEM
- Check the exhaust system for restrictions or damage. Refer to Exhaust System for the engine being diagnosed.
Is the exhaust system restricted or damaged?
Yes REPAIR as necessary. REFER to Exhaust System for the engine being diagnosed. No GO to C5 - C5 CHECK THE WASTEGATE
- Check the wastegate for damage. Verify the wastegate linkage moves freely.
Is the wastegate, wastegate actuator or linkage damaged?
Yes REPAIR as necessary. REFER to Fuel Charging and Controls - Turbocharger for the engine being diagnosed. No GO to C6 - C6 CHECK THE TURBOCHARGER
- Remove the air cleaner outlet pipe and CAC intake pipe. Refer to Intake Air Distribution and Filtering for the procedure.
- Inspect the compressor wheel for damage.
- Check that the turbine shaft spins freely.
- Check for contact marks between the compressor wheel and the housing.
Is the turbocharger damaged?
Yes INSTALL a new turbocharger. REFER to the Fuel Charging and Controls - Turbocharger for the procedure. No DIAGNOSE internal engine damage. REFER to the Engine System, Diagnosis and Testing for the engine being diagnosed. FOLLOW the pinpoint test to diagnose loss of power, poor idling, runs rough.