TROUBLESHOOTING SERVICE MANUAL NUMBER 22
Page 1C-18 90-860074--1 FEBRUARY 2002
Turbocharger
Ensure that troubles are not due to engine components, especially to injection system,
before troubleshooting turbocharger and/or carrying out corrective action on turbocharger.
Cause
Special Information
1. Smoke from exhaust 1. A. Not enough air getting to engine air
intake
B. Clogged air filter
C. Boost pressure too low
D. Refer to Engine Smoking - Black,
Blue and/or White
2. Loss of power 2. A. Not enough air getting to engine air
intake
B. Clogged air cleaner
C. Boost pressure too low
D. Poor lubrication of turbocharger
E. Defective wastegate valve
F. Rubbing of compressor or turbine
impellers against housing
G. Defective engine gaskets allowing
air or fuel escape into exhaust or intake
system
3. Unusual noises and vibrations at
turbocharger
3. A. Poor lubrication of turbocharger
B. Rubbing of compressor or turbine
impellers against housing
C. Defective engine gaskets allowing
air or fuel escape into exhaust or intake
system
4. Rubbing of compressor or turbine
impellers
against housing
4. A. Poor lubrication of turbocharger
B. Low oil pressure at turbocharger
C. Defective bearings in turbocharger
5. Oil leakage from compressor side 5. A. Clogged air cleaner
B. Boost pressure too low
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