Service Manual

Boost Pressure ISB, ISBe and QSB (Common Rail [...]
Page 10-66 Section 10 - Air Intake System - Group 10
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Actuate the lever by hand to verify that the shaft rotates
freely and is not seized.
Check for excessive movement between the shaft and
bushing.
Replace the turbine housing if the shaft and bushing are
damaged or seized. Refer to the Turbocharger Master
Repair Manual, Bulletin 3380555.
Boost Pressure (010-057)
Measure
Use INSITE™ electronic service tool to measure the
boost pressure at the intake manifold.
Operate the engine at rated rpm and full load. Record the
boost reading.
Alternate Loading Method (if equipped with an automatic
transmission)
If a chassis dynamometer is not available, an alternate
method of engine loading can be used. Stalling the
engine, using the vehicle torque converter, can produce a
full-load condition.
Stall the vehicle until the engine speed is steady at full-
throttle condition.
Record the stall speed and boost reading.