Navistar MaxxForce DT Diagnostic Manual page 46

DIAGNOSTIC MANUAL
Step
15 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
16 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
17
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
18 Verify root cause of frequent regens symptom.
Has root cause for frequent regens been diagnosed and repaired?
42
Action
Action
Action
Action
https://www.truck-manuals.net/
Decision
Go to step 16
Decision
Yes: Repair active fault
code(s) (See Electronic Control
Systems Diagnostics in Engine
Diagnostic Manual). After
repairs are complete, go to step
17.
No: Go to step 17
Decision
Graph 5: Go to step 18
Graph 6: Replace DOC. After
repairs are complete, retest for
original problem.
Decision
Yes: Go to step 19
No: Go back to step 1 of Engine
and Aftertreatment System
Operational Checks on page 5
to verify engine systems are in
satisfactory condition.