7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 527
If the VGT actuator is suspect, use the EST to run
the Out put State Test Low. See “Diagnostic Software
Operation” in Section 3 (page 68). Check crank lever
operation during this test.
VGT Diagnostic Trouble Codes (DTCs)
There are no specific DTCs relating to the wiring or
Output Circuit Check (OCC) for the VGT actuator.
When diagnosing the air management system, VGT
wiring and operation can be tested with the f ollo wing
checks.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• Turbo Breakout Harness
• 12-pin Breakout Harness
• Breakout Box
• Terminal Te st Adapter Kit
• 500 Ohm Resistor Harness
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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