SFI SYSTEM Lack of Power (Turbocharger System)

CAUTION / NOTICE / HINT

Tech Tips


  • The diagnosis flowchart is for lack of power due to turbocharger factors.

  • If symptom-specific diagnosis indicates a turbocharger related problem, check using this flowchart.

PROCEDURE


  1. CHECK TURBOCHARGER SUB-ASSEMBLY


    1. Check for oil leaks and large carbon deposits around the connecting surfaces of the turbocharger sub-assembly.

      A01LVLHE01

      Tech Tips

      If oil leaks or a large amount of carbon deposits exist, air leaks from the respective sealing surfaces may be causing the lack of boost pressure.

      Result
      Result Proceed to
      An oil leak or large amount of carbon deposits does not exist. A
      A large amount of carbon deposits exist around the turbine housing, flange or gaskets in any of the areas (A) shown in the illustration. B
      A large amount of carbon deposits exist around the waste gate valve link. C
      Oil is leaking from between the sealing surfaces of the seal plate and compressor housing or bearing housing in the area (B) shown in the illustration. D
      Oil is leaking from the compressor housing in any of the areas (C) shown in the illustration. E

    B

    CHECK EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY Click here

    C

    CHECK TURBOCHARGER SUB-ASSEMBLY (INSPECT TURBINE HOUSING) Click here

    D

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    E

    CHECK AND REPAIR AIR TUBE OR HOSE CLAMP

    A

  2. CHECK TURBOCHARGER SUB-ASSEMBLY (INSPECT TURBINE SHAFT)


    1. Check for loose turbine mounting nuts and for axial play in the turbine shaft.

      Click here

      Tech Tips

      If the turbine shaft catches or there is no play, seal failure due to seizure or improper operation due to accumulation of deposits is suspected.

      Result
      Result Proceed to
      No turbine shaft malfunction A
      Turbine shaft malfunction B

    B

    REPLACE TURBOCHARGER SUB-ASSEMBLY (TURBINE SHAFT MALFUNCTION) Click here

    A

  3. CHECK TURBOCHARGER SUB-ASSEMBLY (INSPECT WASTE GATE VALVE)


    1. Use a vacuum pump to apply -35 +/-4.0 kPa (-263 +/-35 mmHg) negative pressure to the diaphragm chamber and check that the waste gate valve seats.

      Note

      Do not apply a negative pressure of -65 kPa (-488 mmHg) or more to the waste gate valve actuator with bracket assembly, as doing so may damage the diaphragm.

      Standard
      Waste gate valve seats without a gap
      Result
      Result Proceed to
      Seats at less than -35 kPa (-263 mmHg) negative pressure A
      Seats at -35 kPa (-263 mmHg) or greater negative pressure B
      Waste gate valve does not move C

    B

    REPLACE TURBOCHARGER SUB-ASSEMBLY (WASTE GATE VALVE ACTUATOR MALFUNCTION) Click here

    C

    REPLACE TURBOCHARGER SUB-ASSEMBLY (WASTE GATE VALVE MALFUNCTION) Click here

    A

  4. CHECK TURBOCHARGER SUB-ASSEMBLY (INSPECT WASTE GATE VALVE)


    1. Check for play in the waste gate valve and waste gate valve link.

      Standard
      Play exists

      Tech Tips

      Some play is required as the waste gate valve link slides. If no play exists, the valve is determined to be stuck.

    2. Check for gaps at the waste gate valve contact surface due to scratches, deformation or wear.

      Standard
      0.15 mm (0.0059 in.) or less
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TURBOCHARGER SUB-ASSEMBLY (WASTE GATE VALVE MALFUNCTION) Click here

    OK

  5. CHECK TURBOCHARGER SUB-ASSEMBLY (INSPECT AIR BY-PASS VALVE)


    1. Inspect the air by-pass valve.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPLACE TURBOCHARGER SUB-ASSEMBLY (AIR BY-PASS VALVE MALFUNCTION) Click here

  6. CHECK EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY


    1. Check for deformation or cracks in the mounting surfaces on the exhaust manifold converter sub-assembly and the turbocharger sub-assembly.

      Tech Tips

      Deformation or cracks on a mounting surface may allow exhaust gas to leak from the damaged position.

      Standard
      No deformation or cracks on a mounting surface
      Result
      Result Proceed to
      No problem with the mounting surface A
      Deformation or cracks on the exhaust manifold converter sub-assembly mounting surface B
      Deformation or cracks on the turbocharger sub-assembly mounting surface C

    B

    REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY Click here

    C

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    A

  7. REPLACE GASKET


    1. Replace the gasket between the exhaust manifold converter sub-assembly and turbocharger sub-assembly.

      Result
      Proceed to
      NEXT

    NEXT

  8. PERFORM SIMULATION TEST


    1. Check that the abnormal state has disappeared.

      Result
      Proceed to
      NEXT

    NEXT

    END

  9. CHECK TURBOCHARGER SUB-ASSEMBLY (INSPECT TURBINE HOUSING)


    1. Check that the bushing of the turbine housing waste gate valve link is free of cracks and the play does not exceed 0.15 mm (0.0059 in.).

      Standard
      No cracks and play does not exceed 0.15 mm (0.0059 in.)
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPLACE TURBOCHARGER SUB-ASSEMBLY (TURBINE HOUSING MALFUNCTION) Click here