Table of Contents
Advertisement
Figure 96 Injector Disable tests
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) or higher.
•
If
the
EOT
indicator
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 Collect Data from I6 Injector Disable
Diagnostics window.
shown.)
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
3 DIAGNOSTIC SOFTWARE OPERATION
is
red,
erroneous
(Baseline values will be
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Figure 97 Injector Disable test data
5. Record baseline values for EOT, average fuel
rate, and average engine load on Diagnostic
Form.
NOTE:
Listen
for
cylinder-to-cylinder.
6. Select cylinder number and select Run. (Injector
selected will be disabled and engine tone should
change.)
Figure 98 Injector Disable test data
7. Select Collect Data.
8. Record values for EOT, average fuel rate, and
average engine load on Diagnostic Form.
9. Select Done to close Collect Data window.
10. Repeat steps 6 through 9 for the remaining
cylinders.
11. Select Normal Operation
12. Subtract the baseline for (average fuel rate) from
the (average fuel rate) for each injector and record
the difference (deviation) on Diagnostic Form.
13. Add deviations for (average fuel rate) for all
injectors and divide by 6. (Round to the nearest
tenth - this is the cut off value for fuel rate.)
14. Record cut off value on Diagnostic Form.
89
tone
changes
from
Advertisement
Chapters
Table of Contents
