DIAGNOSTIC MANUAL
Table 184
Parked Regen Checks
Using EST with ServiceMaxx™ software, open the Aftertreatment session. Open the inhibitors tab and check
for Inhibitors.
Checks
Expected Results
Comment
Engine condition
Smooth, not stumbling
If engine does not run smoothly, diagnose engine
performance problem. See “PERFORMANCE
DIAGNOSTICS in appropriate Engine Diagnostic Manual.
DPF Status
Regen Needed
If signal reads “Not needed”, than a Regen cannot be
commanded to run.
Engine Coolant
Temperature
Above 150ºF (66ºC)
If below 150ºF (66ºC), warm engine above set point.
AFT Regen Status
Active
If signal reads “Not Active”, check for fault codes and
Parked Regen Inhibitors.
EGR Position
Closed
If not closed, diagnose sensor or circuit (See appropriate
Engine Diagnostic Manual).
ETV Position
80% ±5%
If not within specifications, see diagnose sensor or circuit
(See appropriate Engine Diagnostic Manual).
DOCIT
482ºF (250ºC) to
572ºF (300ºC)
If below 482ºF (250ºC), using Electronic Service Tool
(EST) with ServiceMaxx™ software, run the KOER Air
Management Test.
If above 572ºF (300ºC), check for proper ETV operation,
and if engine is over fueling.
DOCOT
After 5-10 minutes
above 986ºF (530ºC)
If below 986ºF (530ºC), diagnose and repair active
DOCOT fault code(s) (Ex. SPN 4766 FMI 10). If no active
fault code(s), go to appropriate aftertreatment system
diagnostics section in this manual.
DPFOT
Below 1292ºF (700ºC)
If above 1292ºF (700ºC), diagnose and repair active
DPFOT fault code(s). If no active fault code(s), go to
appropriate aftertreatment system diagnostics section in
this manual.
DPFDP
Below 0.5 psi (3.4
kPa)
If above 0.5 psi (3.4 kPa), after the system completes a
full Parked Regen, diagnose and repair active DPFDP
fault code(s). If no active fault code(s), go to appropriate
aftertreatment system diagnostics section in this manual.
If the DPF is face plugged, measure the distance between the filter and outlet. If not within specification,
the filter cannot be cleaned and must be replaced.
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