Navistar MaxxForce DT Diagnostic Manual page 41

Step
10 Determine if removed aftertreatment system components need to be
cleaned see DPF and DOC reuse guidelines page 159.
Based on DPF and DOC Re-Use Guidelines, do any of the removed
aftertreatment system components need to be cleaned?
Step
11 Determine root cause of exhaust system contamination. (See
Engine Symptoms Diagnostics section in Engine Diagnostic
Manual.)
Step
12 Check for a failed Air Management System (AMS) actuator.
1. Using 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:
• Mass Air Flow (MAF) mean value
• Intake Manifold Pressure (IMP)
• Exhaust Gas Recirculation (EGR) valve position
Does snapshot match Graph 1 or Graph 2 page 51?
Action
Action
Action
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DIAGNOSTIC MANUAL
Decision
Yes: Clean components
using appropriate cleaning
equipment. After cleaning
procedure is complete, Install
components and go to step 11.
No: Install removed
aftertreatment system
components, and then go
to step 11.
Decision
After repairs are complete, go
to step 12.
Decision
Graph 1: Go to step 12A
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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