Mazda 6 Facelift 2005, Training Manual

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Engine Diesel Engines
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The DPF is a monolith made of silicon carbide ceramics, which features a high
resistance against temperature fluctuations. The individual channels of the filter have
porous dividing walls and are closed at alternative ends. As a result, the exhaust gas is
forced to flow through the dividing walls, which retain the soot particles and allow
gaseous components to pass. The accumulation of particles in the filter increases the
filtration effect still further.
M5_01038
1 Cleaned exhaust gas 3 Exhaust gas from engine
2 DPF 4 Oxidation catalytic converter
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To avoid the DPF from becoming blocked with soot particles it must be regenerated at
regular intervals, i.e. the soot particles collected in the filter are burnt off. In addition, the
regeneration process reduces the exhaust gas back-pressure caused by the soot
amount accumulated, preventing an increase in fuel consumption.
NOTE: On vehicles with a higher mileage soot residues can often form on the exhaust
tailpipe. This is an inherent by-product of the regeneration process and should not be
considered a concern.
NOTE: Under certain conditions it is possible for white smoke to be emitted from the exhaust
tailpipe during regeneration. This is also a by-product of the regeneration process
and should not be considered a concern.
Service Training Mazda6 Facelift 01-61