88 3 DIAGNOSTIC SOFTWARE OPERATION
NOTE: The EOT indicator will chan g e 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.
However, when diagnosing a cold misfire, a
technician can listen to tone changes 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 stable, making comparisons
from cylinder 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 a nd reinstalled
or replaced, test drive vehicle for 20 miles before
checking for misfire or rough idle.
Figure 94 C lose session
7. When finished with this test, selec t Session from
menu bar, then Close.
Manual Test - Engine Hot
NOTE: This is an alternate method only. This Manual
test should only be used when MasterDiagnostics®
software does not have the Automatic test (auto run
feature) and the engine is hot.
The EOT indicator will change from red to green when
engine temperature reaches 70 °C (158 °F) or higher.
• If the EOT indicator is red, erroneous
comparisons are likely from cylinder to cylin der.
• When the EOT indicator is green and the engine
temperature is 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.
Shut off one injector at a time and listen for changes
in exhaust tone.
NOTE: Do KOER Standard test before doing the I6
Injector Disable test - Run.
Figure 95 KOER IDT I6 session
1. While engine is running, select
D_KOER_IDT_I6.ssn from the open
session file window and select OPEN to open
the session.
WARNING: To avoid serious personal injury,
possible death or damage to the engine or vehicle,
when running the engine in the service bay, make
sure the parking brake is set, the transmission is
in neutral, and the wheels are blocked.
2. Select Diagnostics from menu bar.
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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