Navistar MaxxForce DT Diagnostic Manual page 115

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 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 Graphs 7 and 8 page 131.
Which graph does snapshot most closely match?
Action
Action
Action
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DIAGNOSTIC MANUAL
Decision
After procedure is complete, 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 7: Go to step 17
Graph 8: Replace DOC. After repairs are
complete, retest for original problem.
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