6 PERFORMANCE DIAGNOSTICS 247
Figure 320 KOER IDT I6 .ssn
1. While engine is running, open D_
KOER_IDT_I6.ssn. to monitor engine operati
on.
Figure 321 Injector Disable Test
2. Select Diagnostics from menu bar.
3. Select I6 Injector Disable Test 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 cylinder to
cylinder.
• When the EOT indicator is green and the
engine temperature is 70 °C (158 °F) or
higher, fuel rate and timing are more s table,
making compariso ns from cylind e r to cylinder
more accurate. Overall engine operation is
more stable.
4. Select cylinder number and select Run. (Injector
selected will be disabled and engine noise should
change.)
5. Select Normal Operation. Injector will be enabled
and engine noise should return to previous state
of operation.
6. Repeat steps 4 and 5 for the remaining cylinders.
NOTE: Listen for tone changes from cylinder to
cylinder.
NOTE: If any injectors are removed and
reinstalled or replaced, test drive vehicle for
20 miles before checking for misfire or roug h idle.
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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