Symptom 3 (Heavy Duty): Spn 3719 Active Only Or Frequent Regens (More Than One Parked Regen Per Day) - Navistar MaxxForce DT Diagnostic Manual

DIAGNOSTIC MANUAL
9.4. SYMPTOM 3 (HEAVY DUTY): SPN 3719 ACTIVE ONLY OR FREQUENT REGENS
(MORE THAN ONE PARKED REGEN PER DAY)
NOTE – Before beginning the following step-based diagnostics, perform all vehicle operational checks
page 80.
NOTE – The number of regens performed in one day may vary depending on application. The following
criteria should be used to determine if a regen is considered frequent:
• Line-haul: More than 1 regen per day is frequent regeneration.
• Severe service: More than 2 regens per day is frequent regeneration.
Step
1
Do Onboard Filter Cleanliness Test (OBFCT) to clear SPN
3719 active fault code(s). Using Electronic Service Tool
(EST) with ServiceMaxx™ software, go to Sessions >
Performance and select the record snapshot icon from the
toolbar. Then go to Tests > KOER Aftertreatment Tests >
Onboard Filter Cleanliness Test.
Is SPN 3719 still active after OBFCT is complete?
Step
2 Determine if Diesel Particulate Filter (DPF), Pre-Diesel
Oxidation Catalyst (PDOC), and Diesel Oxidation Catalyst
(DOC) are contaminated. Remove the DPF, PDOC, and
DOC (see Exhaust System Service Manual), and check for
signs of lube oil and coolant contamination.
NOTE – A black staining in the exhaust tailpipe can occur
on applications that experience high idle times. This is
normal and the DPF should NOT be replaced.
Are the DPF, PDOC, or DOC contaminated?
Step
3 Determine if DPF, DOC, and PDOC are reusable see DPF
and DOC reuse guidelines page 159. .
Based on DPF and DOC Re-Use Guidelines, are the DPF,
DOC, and PDOC reusable?
96
Action
Action
Action
https://www.truck-manuals.net/
Decision
Yes: Go to step 2
No: Go to step 6
Decision
Yes: Go to step 3
No: Go to step 4
Decision
Yes: Go to step 5
No: Replace failed component(s).
After repairs are complete, go to step
5.