Navistar MaxxForce DT Diagnostic Manual page 36

DIAGNOSTIC MANUAL
Step
14 Run DSI System De-Aeration Procedure twice, to purge the Down
Stream Injection (DSI) system of air. Using EST, go to Procedures >
KOER Aftertreatment Procedures > DSI System De-Aeration.
Step
15 Using EST, check Diagnostic Trouble Code (DTC) list for fault code(s)
that may have become active during OBFCT.
Does DTC list contain active fault code(s)?
Step
16
Verify exhaust gas temperatures are within specification.
1. Using Electronic Service Tool (EST) with ServiceMaxx™
software, go to Tests > KOER Aftertreatment Tests >
Onboard Filter Cleanliness Test (OBFCT).
2. Go to Sessions > Performance and select the record
snapshot icon from the toolbar.
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 and 6 page 57.
Which graph does snapshot most closely match?
Step
17 Verify root cause of frequent regens symptom.
Has root cause for frequent regens been diagnosed and repaired?
32
Action
Action
Action
Action
https://www.truck-manuals.net/
Decision
Go to step 15
Decision
Yes: Repair active fault
code(s) (See Electronic
Control Systems Diagnostics
in Engine Diagnostic Manual).
After repairs are complete, go
to step 16.
No: Go to step 16
Decision
Graph 5: Go to step 17
Graph 6: Replace DOC. After
repairs are complete, retest
for original problem.
Decision
Yes: Go to step 18
No: Go back to step 1 of
Engine and Aftertreatment
System Operational Checks
page 5 to verify engine
systems are in satisfactory
condition.