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owners manual Mazda 5
owners manual Mazda 5 - year of production: 2005, 2006, 2007, 2008, 2009, 2010 - Mazda 5 I 1 owners manual EN
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text version of content this owner's manual page from owners manual to the vehicle Mazda 5, year of production 2005 - 2010:
Emission System 2.0 MZR-CD Engine
Heated Oxygen Sensor
• The HO2S (Heated O Sensor) is located behind the DPF and detects the oxygen
2
concentration in the exhaust gas. The HO2S is a broad-band type sensor, i.e. it
generates a clear electrical signal in a wide range from λ = 0.7…∞ (∞ = air with
21 %
oxygen). As a result, the sensor is also capable of detecting the oxygen concentration in
the exhaust gas of a diesel engine, which generally works with an excess-air factor of
λ ∼ 1.4 (at full load) to λ ∼ 3.4 (at idle).
• The information of the HO2S is used for the calculation of the soot amount burnt off in
the DPF.
M5_01045
1 HO2S
• The broad-band type HO2S consists of an oxygen pump cell and a narrow-band O2
sensor (= Nernst cell). nd Nernst cell is a diffusion gap, into
Between the pump cell a
which exhaust gas enters through the gas access passage. The Nernst cell compares
the oxygen concentration of the exhaust gas in the diffusion gap to the oxygen
concentration of the ambient air in the reference air chamber, and outputs a voltage to
the PCM.
• The pump cell serves to maintain the composition of gas in the diffusion gap at λ = 1. By
applying a voltage to the pump cell, oxygen can be pumped from the exhaust gas into
the diffusion gap or vice versa. To achieve this, the PCM compares the output voltage of
the Nernst cell with a reference voltage of 450 mV (equivalent to λ = 1) and controls the
voltage applied to the pump cell accordingly.
01-72 Service Training Mazda5
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Mazda 5 I 1 owners manual
pages 91 - 97
pages 91 - 97
Mazda 5 I 1 owners manual
page 94 / 344
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Download PDFOther available language versions of this manual:
- Mazda 5 I 1 manuel du proprietaire FRshow the owner's manual
pdf - 4.67 MB
Others owner's manuals for this model:
Mazda 5 2005 - 2010 FR - Mazda 5 I 1 manuel du proprietaire - pdf - 4.67 MB
Mazda 5 2010 - 2015 FR - Mazda 5 II 2 manuel du proprietaire - pdf - 5.51 MB
Mazda 5 2005 - 2010 FR - Mazda 5 I 1 manuel du proprietaire - pdf - 4.67 MB
Mazda 5 2010 - 2015 FR - Mazda 5 II 2 manuel du proprietaire - pdf - 5.51 MB