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: Go back to step 1 to verify each
step was completed correctly and the
proper decision was made.
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: Diagnostics complete
No: Diagnose and repair IMP issue
(See Performance Diagnostics section
in Engine Diagnostic Manual). After
repairs are complete, retest for original
problem.
95
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