90 3 DIAGNOSTIC SOFTWARE OPERATION
15. Subtract the baseline for (average engine
load) from the (average engine load) for each
injector and record the difference (deviation) on
Diagnostic Form.
16. Add deviations for (average engine load) for all
injectors and divide by 6. (Round to the nearest
tenth - this is the cut off value for engine load.)
17. Record cut off value on Diagnostic Form.
• If deviation values for average fuel rate and
average engine load are less than the cut
off values for fuel rate and engine load,
the injector is suspect for weak cylinder
contribution (fuel rate and engine load).
• If only one deviation value is less than a cut
off value, do not suspect that cylinder.
• If a suspect cylinder(s) is identified, do
Relative Compression te st to distin guish
between an injector or mechanical problems.
• If the Relative Compression test shows that
cylinders are mechanically sound but the
Injector Disable test shows that one or more
cylinders are bad, replace suspected injector.
Figure 99 Close session
18. When finished with this test, select Session from
menu bar, then Close.
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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