DIAGNOSTIC MANUAL
Step
Action
Decision
13
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.
Go to step 14
Step
Action
Decision
14
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)?
Yes: Repair active fault code(s) (See
Electronic Control Systems Diagnostics
in Engine Diagnostic Manual). After
repairs are complete, go to step 15.
No: Go to step 15
Step
Action
Decision
15
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?
Graph 7: Go to step 16
Graph 8: Replace DOC. After repairs
are complete, retest for original problem.
Step
Action
Decision
16
Verify root cause of frequent regens symptom.
Has root cause for frequent regens been diagnosed and
repaired?
Yes: Diagnostics complete
No: Go back to step 1 of Engine and
Aftertreatment System Operational
Checks page 80 to verify engine
systems are in satisfactory condition.
103
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