Navistar MaxxForce DT Diagnostic Manual page 97

Step
7 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
8 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
Action
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DIAGNOSTIC MANUAL
Decision
Yes: Go to step 8
No: Repair exhaust leak or repair
failed fastener, bracket, or clamp.
After repairs are complete, go to step
8.
Decision
Graph 1: Go to step 9A
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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