Navistar MaxxForce DT Diagnostic Manual page 43

Step
12B Check for Injection Control Pressure (ICP) system issue. Using
EST with ServiceMaxx™ software, use the playback feature and
graph the following signal values from 0 to 60 MPH Test:
Signal Values:
• ICP desired
• ICP
• Injection Pressure Regulator (IPR) valve control %
Compare snapshot to Graph 3 and associated Graph Analysis
page 54.
Is ICP system operating as per Graph 3 Graph Analysis?
Step
12C Check for Air Management System (AMS) issue. Using EST with
ServiceMaxx™ software, use the playback feature and graph the
following signal values from 0 to 60 mph test:
Signal Values:
• Engine Speed
• Engine Load
• Intake Manifold Pressure (IMP)
• Exhaust Back Pressure (EBP)
• Accelerator Pedal Position 1 (APP1)
Compare snapshot to Graph 4 and associated Graph Analysis
page 55.
Is AMS operating as per Graph 4 Graph Analysis?
Action
Action
https://www.truck-manuals.net/
DIAGNOSTIC MANUAL
Decision
Yes: Go to step 12C
No: Diagnose and repair ICP
system issue (See Hard Start
and No Start Diagnostics
section in Engine Diagnostic
Manual). After repairs are
complete, retest for original
problem.
Decision
Yes: Go to step 10
No: Diagnose and repair
AMS issue (See Performance
Diagnostics section in Engine
Diagnostic Manual). After
repairs are complete, retest for
original problem.
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