Navistar MaxxForce DT Diagnostic Manual page 51

Step
5B Check for Injection Control Pressure (ICP) system issue. On the
Electronic Service Tool (EST) with ServiceMaxx™ software, use
the playback feature and graph the following signal values from
the 0 to 60 MPH Test:
• ICP Desired
• ICP Actual
• 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
5C Check for Air Management System (AMS) issue. On the
Electronic Service Tool (EST) with ServiceMaxx™ software, use
the playback feature and graph the following signal values from
the 0 to 60 MPH Test:
• Engine Speed
• Engine Load
• Intake Manifold Temperature (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
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DIAGNOSTIC MANUAL
Decision
Yes: Go to step 5C
No: Diagnose and repair ICP
system issue (See Hard Start/No
Start Diagnostics section in
Engine Diagnostic Manual). After
repairs are complete, go to Step
10A.
Decision
Yes: GO to step 6
No: Diagnose and repair
AMS issue (See Performance
Diagnostics section in the Engine
Diagnostic Manual). After repairs
are complete, go to step 10A.
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