DIAGNOSTIC MANUAL
Step
Action
Decision
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?
Yes: Go to step 9D
No: Repair TC1TOP issue (See
Electronic Control Systems Diagnostics
in Engine Diagnostic Manual). After
repairs are complete, retest for original
problem.
Step
Action
Decision
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?
Yes: Go to step 10
No: Diagnose and repair IMP issue
(See Performance Diagnostics section in
Engine Diagnostic Manual). After repairs
are complete, retest for original problem.
108
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