Engine Diesel Engines
Diesel Particulate Filter System
• The diesel particulate filter system of the vehicles with 2.0 MZR-CD engine has the
following features:
– Diesel particulate filter with differential pressure sensor and three exhaust gas
temperature sensors (upper/middle/lower) has been introduced.
– Heated oxygen sensor located behind the diesel particulate filter has been
introduced.
Diesel Particulates
• Under engine operating conditions such as cold start, acceleration and high engine load
the combustion process of the diesel engine is incomplete, resulting in an increased
formation of soot particles. These microscopically small particles have a diameter of only
about 0.05 µm.
• Soot itself has no harmful effect on the human organism. Hydrocarbons originating from
the fuel and lubricants, as well as water and sulphates, attach themselves to these
granulates, increasing their size to 0.09 µm. In this way the harmful soot particles are
formed.
• The human nose and bronchial tubes are not able to filter out particles smaller than
2.5 µm (for comparison: a hair is about 70 µm thick). As a result, the particles can then
penetrate through the airways deep into the lungs and pose a health threat especially to
children and adults with certain medical conditions. Soot particles are suspected of
triggering allergies and even cancer. This is especially true of the smallest particles
measuring between 0.1…1.0 µm.
• The European Union is introducing progressively stricter emissions legislation to achieve
a long-lasting reduction in air pollution from vehicle emissions. As part of this legislation,
all new Diesel passenger vehicles requiring type approval from January 1
st
2005 must
comply with the Euro 4 emission standard. In addition, all Diesel passenger vehicles first
registered from January 1
st
2006 must meet the Euro 4 standard.
Service Training Mazda6 Facelift 01-59
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