Navistar MaxxForce DT Diagnostic Manual page 105

Step
9 Verify exhaust gas temperatures are within specification.
Use the playback feature in ServiceMaxx™, and graph the
following signal values from step 1 OBFCT:
Signal Values:
• Diesel Oxidation Catalyst Inlet Temperature (DOCIT)
• Diesel Oxidation Catalyst Outlet Temperature (DOCOT)
• Diesel Particulate Filter Outlet Temperature (DPFOT)
• DPF Soot Load
Compare snapshot to Graph 6, 7, and 8 page 129.
Which graph does snapshot most closely match?
Step
10
Check Oxygen Sensor (O
and allow to reach normal operating temperature. Using
EST with ServiceMaxx™ software, go to Sessions >
Performance. Let the engine idle for 5 minutes while
monitoring O S Temperature signal value.
2
Is O S Temperature signal value greater than 1400°F
2
(760°C)?
Step
11 Visually inspect Aftertreatment Fuel Injector (AFI) supply
line for leaks, kinks, bends, or other damage?
Is the AFI supply line leaking or damaged?
Action
Action
S) operation. Start the engine
2
Action
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Decision
Graph 6: Diagnostics complete
Graph 7: Replace DOC. After repairs
are complete, perform an OBFCT to
verify repairs.
Graph 8: Go to step 10
Decision
Yes: Go to step 11
No: Repair O S or circuit (See
2
Electronic Control Systems Diagnostics
in Engine Diagnostic Manual). After
repairs are complete, retest for original
problem.
Decision
Yes: Replace AFI supply line. After
repairs are complete, go to step 13.
No: Go to step 12
101