6 PERFORMANCE DIAGNOSTICS 215
3. KOEO Injector Test
Figure 272
Purpose
To dete rmin e if f uel injectors are workin g
(electronically ) by energizing injectors in a
programmed sequence. The ECM monitors the IDM
results from this test and transmits DTCs, if injectors
or injector circuits are not working correctly.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
Procedure
WARNING: To avoid serious personal injury,
possible death or damage to the engine or
vehicle, read all safety instructi on s in the “Safety
Information” section of this manual.
NOTE: The KOEO Injector Test can only be done with
the EST using MasterDiagnostics® software.
Figure 273 KOEO Injector Test
1. Select Diagnostics from the m enu bar.
2. Select Key-On Engine-Off 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 no t cycled, the
Standard Test does not have to be run again.
3. From the KOEO Diagnostics menu, select
Injector, then select Run to start the test.
NOTE: During this test, injector solenoids should
click in a numerical sequence, not the firing order,
when actuated. If a series of clicks are not heard
for each injector, one or more injectors are not
activating.
The DTC window will show DTCs for electrical
problems.
4. Record DTCs on Diagnostic Form. See
“Diagnostic Trouble Codes” – Appendix C (page
643) for DTCs.
5. Correct problem causing active DTCs.
6. Clear DTCs.
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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