6 PERFORMANCE DIAGNOSTICS 235
Figure 306 KOER Standard Test
3. Select Diagnostics from menu bar.
4. Select Key-On Engine-Running Tests from the
drop down menu.
NOTE: When using the EST to do KOEO or KOER
diagnostic tests, Standard test is always selected
and run first. If the ignition switch is not cycled,
the Standard test does not have to be run again.
5. From the KOER Diagnostics Menu, select
Standard Test and select Run to start the test.
6. The ECM will start the Key-On Engine-Running
Standard Test and command the engine to
accelerate to a predetermined rpm.
During the test, the ECM commands the IPR
through a Step Test to determine if the ICP system
is performing as expected. The ECM monitors
signal values from the ICP sensor and compares
those va lues to the expected values . When the
test is done, the ECM returns the engine to the
normal operating mode and transmits any DTCs
set during t he test.
7. Record DTCs on Diagnostic Form. See
“Diagnostic Trouble Codes” – Appendix C (page
643) for DTCs.
8. Correct problems causing active DTCs.
9. Clear DTCs.
Possible Causes
• Oil leakage in injection control pressure system
• Loose or corroded engine wiring harness for ICP
sensor or IPR valve
• Open or shorted wiring harness to ICP sensor or
IPR valve
• Failed ICP sensor
• Inoperative IPR valve
• Inoperative high-pressure oil pump
• Not enough oil from lube oil system to
high-pressure pump
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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