Symptom 1 (Medium Duty): Frequent Parked Regens With No Active Fault Codes (More Than One Parked Regen Per Day) - Navistar MaxxForce DT Diagnostic Manual

DIAGNOSTIC MANUAL
3.2. SYMPTOM 1 (MEDIUM DUTY): FREQUENT PARKED REGENS WITH NO ACTIVE
FAULT CODES (MORE THAN ONE PARKED REGEN PER DAY)
NOTE – Before beginning the following step-based diagnostics, perform all vehicle operational checks
page 5.
NOTE – SPN 3719 FMI 15 may be inactive when a frequent regen concern is present.
NOTE – SPN 3936 FMI 8 can be active for this symptom.
Step
1 Check for a failed Air Management System (AMS) actuator.
1. Using Electronic Service Tool (EST) with ServiceMaxx™
2. Go to Sessions > Performance and select the record snapshot
3. Go to Tests > KOER Tests > Air Management Test.
When Air Management Test is complete, stop recording. Use the playback
feature in ServiceMaxx™, and graph the following signal values:
Signal Values:
• Mass Air Flow (MAF) Mean Value (MMV)
• Intake Manifold Pressure (IMP)
• Exhaust Gas Recirculation (EGR) valve position
Does snapshot match Graph 1 or Graph 2 page 51?
8
Action
software, go to Tests > Load Test Specific Session and verify
Load Test Specific Session is unchecked.
icon from the toolbar.
https://www.truck-manuals.net/
Decision
Graph 1: Go to
step 2A
Graph 2:
Diagnose and
repair failed
actuator (See
Performance
Diagnostics
section in Engine
Diagnostic
Manual). After
repairs are
complete, retest
for original
problem.