DIAGNOSTIC MANUAL
AFTERTREATMENT SYSTEM OPERATION
11.1. MAXXFORCE
®
11, 13 AND 15
The Aftertreatment (AFT) system, part of the larger exhaust system, processes engine exhaust to meet
emission requirements. The AFT system traps particulate matter (soot) and prevents it from leaving the tailpipe.
The AFT system performs the following functions:
•
Monitors exhaust gas temperatures Diesel Oxidation Catalyst Inlet Temperature (DOCIT), Diesel Oxidation
Catalyst Outlet Temperature (DOCOT), and Diesel Particulate Filter Outlet Temperature (DPFOT).
•
Monitors Diesel Particulate Filter Differential Pressure (DPFDP).
•
Controls engine operating parameters for emission control and failure recognition.
•
Cancels regeneration of the AFT system in the event of catalyst or sensor failure.
•
Calculates the level of ash accumulation in the Diesel Particulate Filter (DPF).
•
Initiates regeneration of the AFT system when DPF soot load is too high by increasing exhaust gas
temperatures.
•
Maintains vehicle and engine performance during regeneration.
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