*CHECKING THE BOOST PRESSURE SYSTEM

For a complete wiring diagram Refer to Section 8W



Possible Causes
  
TURBOCHARGER ASSEMBLY
  
BOOST PRESSURE ACTUATOR SUPPLY HOSE
  
BOOST PRESSURE ACTUATOR
  
INTAKE OR EXHAUST SYSTEM PROBLEM
  


1.CHECKING THE BOOST PRESSURE ACTUATOR OPERATION





NOTE: The armature should be in the 10 o'clock position with the ignition off (armature in rest position).



NOTE: The armature should move counterclockwise from the 10 o'clock position to the 9 o'clock position.



Is the Boost Pressure Actuator operating from the 10 o'clock to the 9 o'clock position when 20 inches of vacuum is applied?

Yes
  • Go to 4


No
  • Go To 2

2.CHECKING THE BOOST PRESSURE ACTUATOR SUPPLY HOSE


NOTE: Problems with this hose will cause incorrect vacuum to the Boost Pressure Actuator resulting in driveability problems.



Were any problems found?

Yes


No
  • Go to 3

3.CHECK FOR BOOST PRESSURE ACTUATOR LINKAGE PROBLEM



Were any problems found?

Yes


No
  • Refer to the Service Information and replace the Boost Pressure Actuator or Turbocharger Assembly as necessary.

4.CHECK FOR INTAKE AND EXHAUST SYSTEM RESTRICTIONS





Were any problems found?

Yes


No
  • Go to 5

5.CHECKING THE BOOST PRESSURE ACTUATOR OPERATION

NOTE: The engine temperature must be above 160°F for this test to be valid.








NOTE: The Boost Pressure hpa reading should increase more than 100 hpa as well as an audible engine tone change when 15 inches of vacuum is applied.



Does the Boost Pressure hpa reading increase more than 100 hpa when 15 inches of vacuum is applied?

Yes
  • Test complete.


No