Navistar MaxxForce DT Diagnostic Manual page 49

Step
3 Perform 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 test is running,
check the following components for exhaust leaks and verify all
fasteners, brackets and clamps are secure and undamaged.
1. Low Pressure (LP) turbocharger outlet pipe
2. Exhaust Back Pressure Valve (EBPV)
3. Flexible Mesh pipe to Diesel Oxidation Catalyst
(DOC) Inlet
4. Inlet to the DOC
Are all components free of exhaust leaks and all fasteners,
brackets and clamps secure and undamaged?
Step
4 Check for a Failed Air Management System (AMS) actuator.
1. Using an 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:
• 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
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DIAGNOSTIC MANUAL
Decision
Yes: Repair complete
No: Repair any leaks, damage,
and loose parts. End of
diagnostics.
Decision
Graph 1: Go to step 5A
Graph 2: Diagnose and repair
failed actuator (See Performance
Diagnostics section in Engine
Diagnostic Manual). After repairs
are complete, retest for original
problem.
45