Navistar MaxxForce DT Diagnostic Manual page 120

DIAGNOSTIC MANUAL
Step
5B Check for low fuel rail pressure. Using Electronic
Service Tool (EST) with ServiceMaxx™ software, use
the playback feature and graph the following signal
values from Lug Down Test:
Signal Values:
• Engine Speed
• Fuel Rail Pressure (FRP)
• Fuel Rail Pressure Desired (FRPD)
Compare snapshot to Graph 3 and associated Graph
Analysis page 124.
Is FRP reacting to FRPD as per Graph 3 Graph
Analysis?
Step
5C Verify aftertreatment system is free of restrictions. Using
Electronic Service Tool (EST) with ServiceMaxx™
software, 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 120.
Is TC1TOP signal operating as per Graph 4 Graph
Analysis?
116
Action
Action
https://www.truck-manuals.net/
Decision
Yes: Go to step 5C
No: Diagnose and repair low fuel rail
pressure (See Performance Diagnostics
section in Engine Diagnostic Manual).
After repairs are complete, retest for
original problem.
Decision
Yes: Go to Step 5D
No: Repair TC1TOP issue (See
Electronic Control Systems Diagnostics in
Engine Diagnostic Manual). After repairs
are complete, retest for original problem.