LAUNCH
3001
User’s Manual
16
and saves the code in its long-term memory.
12. PM Filter Monitor
The particulate matter (PM) filter 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 filters are self-cleaning by periodic modification of the
exhaust gas concentration in order to burn off the trapped particles (oxidizing the
particles to form CO
2
and water). The computer monitors the efficiency of the filter
in trapping particulate matter, as well as the ability of the filter to regenerate
(self-clean).
The PM Filter Monitor is supported by “compression ignition” vehicles only. The
PM Filter 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.
2.6.3 OBD 2 Reference Table
The table below lists current OBD 2 Monitors, and indicates the following for each
Monitor:
A. Monitor Type (how often does the Monitor run; Continuous or Once per trip).
B. Number of trips needed, with a fault present, to set a pending DTC.
C. Number of consecutive trips needed, with a fault present, to command the MIL
“On” and store a DTC.
D. Number of trips needed, with no faults present, to erase a Pending DTC.
E. Number and type of trips or drive cycles needed, with no faults present, to turn
off the MIL.
F. Number of warm-up periods needed to erase the DTC from the computer’s
memory after the MIL is turned off.
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