Navistar MaxxForce DT Diagnostic Manual page 99

Step
9C Verify aftertreatment system is free of restrictions. Using
EST, use the playback feature and graph the following signal
values from Lug Down Test:
Signal Values:
• Engine Speed
• Turbocharger 1 Turbine Outlet Pressure (TC1TOP)
Compare snapshot to Graph 4 and associated Graph
Analysis page 126.
Is TC1TOP signal operating as per Graph 4 Graph Analysis?
Step
9D Check for an Intake Manifold Pressure (IMP) issue. Use the
playback feature in ServiceMaxx™, and graph the following
signal values from Lug Down Test:
Signal Values:
• Engine Speed
• Intake Manifold Pressure (IMP)
• Accelerator Pedal Position 1 (APP1)
• Vehicle Speed
Compare snapshot to Graph 5 and associated Graph
Analysis page 127.
Is IMP operating as per Graph 5 Graph Analysis?
Action
Action
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DIAGNOSTIC MANUAL
Decision
Yes: Go to step 9D
No: Go back to step 1 to verify each
step was completed correctly and the
proper decision was made.
Decision
Yes: Diagnostics complete
No: Diagnose and repair IMP issue
(See Performance Diagnostics section
in Engine Diagnostic Manual). After
repairs are complete, retest for original
problem.
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