Navistar MaxxForce DT Diagnostic Manual page 96

DIAGNOSTIC MANUAL
Step
3 Determine if PDOC or DOC is contaminated. Remove the
PDOC and DOC (see Exhaust System Service Manual), and
check for signs of lube oil and coolant contamination.
NOTE – A black staining in the exhaust tailpipe can occur
on applications that experience high idle times. This is
normal and the DPF should NOT be replaced.
Are the PDOC and DOC contaminated?
Step
4
Determine if DPF, DOC, and PDOC are reusable see DPF
and DOC reuse guidelines page 159.
Based on DPF and DOC Re-Use Guidelines, are the DPF,
DOC, and PDOC reusable?
Step
5
Determine if removed aftertreatment system components
need to be cleaned see DPF and DOC reuse guidelines page
159.
Based on DPF and DOC Re-Use Guidelines, do any of the
removed aftertreatment system components need to be
cleaned?
Step
6 Determine root cause of exhaust system contamination. (See
Engine Symptoms Diagnostics section in Engine Diagnostic
Manual.)
92
Action
Action
Action
Action
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Decision
Yes: Remove DPF, and then go to
step 4.
No: go to step 5
Decision
Yes: Go to step 6
No: Replace failed component(s).
After repairs are complete, go to step
6.
Decision
Yes: Clean components using
appropriate cleaning equipment. After
cleaning procedure is complete, install
components and go to step 7.
No: Install removed aftertreatment
system components, and go to step 7.
Decision
After repairs are complete, go to step
7.