Navistar MaxxForce DT Diagnostic Manual page 24

DIAGNOSTIC MANUAL
Step
8 Do Onboard Filter Cleanliness Test (OBFCT) to clear active
aftertreatment fault code(s). Using Electronic Service Tool (EST)
with ServiceMaxx™ software, go to Tests > KOER Aftertreatment
Tests > Onboard Filter Cleanliness Test. While OBFCT is running,
check the following components for exhaust leaks, and verify all
fasteners, brackets, and clamps are secure and undamaged:
• Low Pressure (LP) turbocharger outlet pipe
• Exhaust Back Pressure Valve (EBPV)
• Flexible mesh pipe to DOC inlet
• Inlet to DOC
Were all components free of exhaust leaks, and all fasteners,
brackets, and clamps secure and undamaged?
Step
9
Check for a failed Air Management System (AMS) actuator.
1. Using EST with ServiceMaxx™ software, go to Tests
2. Go to Sessions > Performance and select the record
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?
20
Action
Action
> Load Test Specific Session and verify Load Test
Specific Session is unchecked.
snapshot icon from the toolbar.
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Decision
Yes: Go to step 9
No: Repair exhaust leak
or repair failed fastener,
bracket, or clamp. After
repairs are complete, go
to step 9.
Decision
Graph 1: Go to step 10A
Graph 2: Diagnose and
repair failed actuator
(See Performance
Diagnostics section
in Engine Diagnostic
Manual). After repairs
are complete, retest for
original problem.