Navistar MaxxForce DT Diagnostic Manual page 16

DIAGNOSTIC MANUAL
Step
3 Verify exhaust gas temperatures are within specification.
1.
2. Go to Tests > KOER Aftertreatment Tests > Onboard Filter
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 Particulate Filter Inlet Temperature (DPFIT)
• Diesel Particulate Filter Outlet Temperature (DPFOT)
• DPF Soot Load
Compare snapshot to Graph 5, 6, and 7 page 57.
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?
12
Action
Using Electronic Service Tool (EST) with ServiceMaxx™
software, go to Sessions > Performance and select the record
snapshot icon from the toolbar.
Cleanliness Test.
Action
https://www.truck-manuals.net/
Decision
Graph 5:
Diagnostics
complete
Graph 6: Go to
step 4
Graph 7: Go to
step 7
Decision
Yes: Remove
PDOC, and go to
step 5.
No: Install DPF
and DOC, and go
to step 7.