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Professional 909 User Manual
hydrocarbons to produce H2O and N2. The NOx Aftertreatment Monitor monitors
the function of the NOx aftertreatment to ensure that tailpipe emissions remain
within acceptable limits.
The NOx Aftertreatment Monitor is supported by “compression ignition” vehicles
only. The NOx Aftertreatment Monitor is a “Two-Trip” Monitor. If a fault is found
on the first trip, the computer temporarily saves the fault in its memory as a
Pending Code. The computer does not command the MIL on at this time. If the
fault is sensed again on the second trip, the computer commands the MIL “On,”
and saves the code in its long-term memory.
10. Boost Pressure System Monitor
The boost pressure system serves to increase the pressure produced inside the
intake manifold to a level greater than atmospheric pressure. This increase in
pressure helps to ensure compete combustion of the air-fuel mixture. The Boost
Pressure System Monitor checks for component integrity and system operation,
and tests for faults in the system. The computer runs this Monitor once per trip.
The Boost Pressure System Monitor is supported by “compression ignition”
vehicles only. The Boost Pressure System Monitor is a “Two-Trip” Monitor. If
a fault is found on the rst trip, the computer temporarily saves the fault in its
memory as a Pending Code. The computer does not command the MIL on at
this time. If the fault is sensed again on the second trip, the computer commands
the MIL “On,” and saves the code in its long-term memory.
11. Exhaust Gas Sensor Monitor
The exhaust gas sensor is used by a number of systems/monitors to determine
the content of the exhaust stream. The computer checks for component integrity,
system operation, and tests for faults in the system, as well as feedback faults
that may affect other emission control systems.
The Exhaust Gas Sensor Monitor is supported by “compression ignition” vehicles
only. The Exhaust Gas Sensor Monitor is a “Two-Trip” Monitor. If a fault is found
on the first trip, the computer temporarily saves the fault in its memory as a
Pending Code. The computer does not command the MIL on at this time. If the
fault is sensed again on the second trip, the computer commands the MIL “On,”
and saves the code in its long-term memory.
12. PM Filter Monitor
The particulate matter (PM) lter removes particulate matter from the exhaust
stream by filtration. The filter has a honeycomb structure similar to a catalyst
substrate, but with the channels blocked at alternate ends. This forces the
exhaust gas to flow through the walls between the channels, filtering the
particulate matter out. The lters are self-cleaning by periodic modication of the
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