Mitsubishi MOTORS Outlander 2007, Service Manual, Technical Information & Body Repair Manual Data

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3. HC TRAP CATALYTIC CONVERTER
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ZK602531AA00
Three-way catalyst
Exhaust
gas
HC trap catalyst
The HC trap catalytic converter is installed to the center of
exhaust pipe under the vehicle's floor. The HC trap catalytic
converter consists of the HC trap catalyst and the three-way
catalysts, which are the monolith type; the catalyst element is
attached to the honeycomb catalyst surface. The HC trap
catalyst and the three-way catalysts are held by the heat-
insulating mat and installed in the shell. The HC trap catalyst
temporarily absorbs the exhaust HC from the engine within the
temperature range in which the three-way catalyst is not
activated, and prevents the exhaust HC from releasing outside
the vehicle. After that, the HC trap catalyst temperature rises and
releases the absorbed HC. The released HC is burnt out in the
downstream three-way catalyst.
CENTER EXHAUST PIPE HEATED OXYGEN
SENSOR
ZK603449AA00
Center exhaust pipe
heated oxygen sensor
HC trap catalytic
converter
The center exhaust pipe heated oxygen sensor is installed to the
HC trap catalytic converter. The center exhaust pipe heated
oxygen sensor detects the oxygen density of the exhaust gas
and outputs the voltage to the ECM in accordance with the
oxygen density.
The ECM uses this output voltage to detect the deterioration of
the HC trap catalytic converter. The structure of the center
exhaust pipe heated oxygen sensor is the same as that of the
heated oxygen sensor (rear) installed in the exhaust manifold on
the both banks.
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