252 6 PERFORMANCE DIAGNOSTICS
NOTE: When using t he EST to do KOEO or KOER
diagnostic tests, Standard Test is always selected
and run fi rst. If the ignition switch is not cycled, the
Standard Test does not have to be run again.
4. From the KOER Diagnostics menu, select Air
Management test and select Run to start the test.
The ECM will start the Air Management Test
and command the engine to accelerate to a
predetermined rpm. The ECM will monitor
the effects of the VGT and EGR contro l valve
movement using feedback signals from the EBP
sensor.
• If a p ro ble m is detec ted the ECM will cancel
the test, set a DTC, and restore normalengine
operation.
5. Record DTCs on Diagnostic Form. See
“Diagnostic Trouble Codes” – Appendix C (page
643) for DTCs.
6. Correct problems causing active DTCs. To help
do Test 14 VGT Test.
7. Clear DTCs.
Possible Caus es
• Exhaust leaks
• Intake leaks
• Intake and exhaust restrictions
• Plugged EBP tube assembly
• Biased MAP or EBP sensor
• Failed VGT actu ator
• Failed turbocharger
• Failed EGR control valve
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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