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
Action
Decision
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?
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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