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FX9000 User Manual
fuel and creates increased emissions, such as carbon monoxide and some
hydrocarbons. A Secondary Air System injects air into the exhaust stream to aid
catalytic converter operation:
• It supplies the catalytic converter with the oxygen it needs to oxidize the
carbon monoxide and hydrocarbons left over from the combustion process
during engine warmup.
• The extra oxygen injected into the exhaust stream also helps the catalytic
converter reach operating temperature more quickly during warm-up periods.
The catalytic converter must heat to operating temperature to work properly.
The Secondary Air 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 Secondary Air System Monitor is a “Two-Trip” monitor. If a fault is found
on the first trip, the computer temporarily saves this 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.
Note: The following Monitors became standard beginning in 2010. The
majority of vehicles produced before this time will not support these Monitors.
2.6.3 OBD II Reference Table
The table below lists current OBD II 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 o the MIL.
F. Number of warm-up periods needed to erase the DTC from the computer’s
memory after the MIL is turned o.
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