Navistar MaxxForce DT Diagnostic Manual page 113

Step
10 Verify exhaust gas temperatures are within specification.
Use the playback feature in ServiceMaxx™, and graph
the following signal values from step 2 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
11 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
12 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 11
Decision
Yes: Go to step 12
No: Repair O S or circuit (See Electronic
2
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 14.
No: Go to step 13
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