Navistar MaxxForce DT Diagnostic Manual page 90

DIAGNOSTIC MANUAL
Step
3 Verify exhaust gas temperatures are within specification.
1.
ServiceMaxx™ software, go to Sessions >
Performance and select the record snapshot icon
from the toolbar.
2. Go to Tests > KOER Aftertreatment Tests >
Onboard Filter Cleanliness Test.
When OBFCT is complete, stop recording. Use the playback
feature and graph the following signal values from OBFCT:
Signal Values:
• Diesel Oxidation Catalyst Inlet Temperature (DOCIT)
• Diesel Oxidation Catalyst Outlet Temperature (DOCOT)
• Diesel Particulate Filter Outlet Temperature (DPFOT)
• DPF Soot Load
Compare snapshot to Graph 6, 7, and 8 page 129.
Which graph does snapshot most closely match?
Step
4 Determine if DPF or DOC is contaminated. Remove the DPF
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 DPF or DOC contaminated?
Step
5
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?
86
Action
Using Electronic Service Tool (EST) with
Action
Action
https://www.truck-manuals.net/
Decision
Graph 6: Diagnostics complete
Graph 7: Go to step 4
Graph 8: Go to step 7
Decision
Yes: Remove PDOC, and then go to
step 5
No: Install DPF and DOC, and go to
step 7
Decision
Yes: Install removed aftertreatment
system components, and go to step
6.
No: Replace failed component(s).
After repairs are complete, go to
step 6.