86 3 DIAGNOSTIC SOFTWARE OPERATION
Figure 88 Injector Disable Tests
2. Select Dia g no st ics from me nu bar.
3. Select I6 Injector Disable Tests from drop down
menu.
NOTE: The EOT indicator will change from red
to green when engine temperature reaches 70 °C
(158°F)orhigher.
• If the EOT indicator is red, erroneous
comparisons are likely from cylinde r to
cylinder.
However, when diagnosing a cold misfi re, a
technician can listen to tone changes from
cylinder-to-cylinder.
• When the EOT indicator is green and the
engine is at 70 °C (158 °F) or higher, fuel
rate and timing are more stable, making
comparisons from cylinder to cylinder more
accurate. Overall engine operation is more
stable.
4. Select Auto Run.
NOTE: While running the engine listen for tone
changes from cylinder-to-cylinder.
NOTE: If any injectors are removed and
reinstalled or replaced, test drive vehicle for
20 miles bef ore c hecking for misfire or rough idle.
Figure 89 I6 Injector Disable test results (Auto
Run - Text View)
Figure 90 I6 Injector Disable test results (Auto
Run-GraphView)
During Auto Run, injectors are shutoff one at a time (1
through 6 numerical sequence). Base line data and
results for each cylinder is displayed in the w indow
(Text View) for I6 Injector Disable test results. Test
data fo r each cy lind er can also be viewed by selecting
the (Graph View). When finished the engine will return
to normal operation.
Figure 91 Close session
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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