Beetle L4-1.9L DSL Turbo (ALH) (1998)
Boost Solenoid: All Technical Service Bulletins
Diesel Engine - Poor Acceleration, Low Turbo Boost
21 07 04
April 23, 2007
2012043 Supersedes T.B. Group 21 number 06 01 dated Dec. 5, 2006 due to change in actuator hose clamp part number and updated labor operation
number.
Vehicle Information
Condition
Customer Complains of Poor Acceleration - Insufficient Turbo Boost
Vehicle may lack engine power or exhibit reduced boost from the turbocharger. MIL may be illuminated with over- boost or under-boost faults set in the
ECM.
Technical Background
Due to the mounting location of the Vacuum Actuator on the turbocharger, it is possible that overtime, with the accumulation of moisture and/or road
debris, the vacuum actuator may seize or stick causing faults to occur.
Production Solution
No production change required.
Service
Replace vacuum actuator on turbocharger with new design Part No.038198716.
Inspection of turbine
Tip:
Part number(s) are for reference only. Always see Parts Dept. for the latest part(s) information.
Inspection of turbine
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Check turbocharger (intake side) and turbine for visible damage or contact with housing.
^
Check for high resistance when rotating turbine impeller.
Tip:
Some lateral and horizontal movement of the compressor wheel/impeller is normal and does not indicate a failed or failing turbocharger.