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

9.2. SYMPTOM 1 (HEAVY 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 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 parked regen per day is frequent regeneration.
• Severe service: More than 2 parked regens per day is frequent regeneration.
Step
1
Check for a failed Air Management System (AMS) actuator.
1. Using Electronic Service Tool (EST) with
ServiceMaxx™ software, go to Tests > Load Test
Specific Session and verify Load Test Specific
Session is unchecked.
2. Go to Sessions > Performance and select the
record snapshot icon from the toolbar.
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:
• Engine Speed
• Intake Manifold Pressure (IMP)
• Turbocharger 2 Wastegate Control (TC2WC)
Does snapshot match Graph 1 or Graph 2 page 120?
Action
https://www.truck-manuals.net/
DIAGNOSTIC MANUAL
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.
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