Mazda CX-5 Service & Repair Manual: Catalytic Converter
Purpose, Function
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Purifies contaminants in the exhaust gas by utilizing the chemical reactions of the three-way catalytic converter.
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A WU-TWC and a TWC have been adopted.
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The three-way catalyst is integrated with the exhaust manifold.
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Because the catalyst receives the high temperature exhaust gas just after the gas is exhausted, it activates quickly and achieves an improved purification performance.
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A single-nano catalyst has been adopted in which the purification performance can be maintained using less precious metal materials than conventional catalysts.
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WU-TWC
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TWC
Construction
WU-TWC
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The WU-TWC is installed to the rear of the engine.
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The WU-TWC is integrated with the exhaust manifold.
TWC
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The TWC is installed to the rear of the WU-TWC.
2WD
AWD
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A single-nano catalyst has been adopted for the under-floor three-way catalyst. With a conventional three-way catalyst, the precious metals move and agglutinate to each other by the heat of the exhaust gas because they are structured such that they adhere on catalyst material. Therefore, it was necessary to use a large amount of precious metal because it is estimated that the purification performance lowers due to the decrease in the surface area of the precious metals. The single-nano catalyst is structured such that it embeds small precious metal particles into the catalyst material. Because the precious metal particles do not agglutinate on the surface of the three-way catalyst, it can maintain superior purification performance using less precious metal than the conventional system.
Operation
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Contaminants in the exhaust gas (HC, CO, NOx) are purified by oxidization and deoxidization while they are passing through the catalytic converter.
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Oxidization process
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Noxious hydrocarbon (HC) and carbon monoxide (CO) are bound with oxygen and converted to non-noxious carbon dioxide and water.
O2+HC+CO>CO2+H2O
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Deoxidization process
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Noxious nitrogen oxide (NOx) is converted to non-noxious nitrogen and oxygen. A part of the oxygen generated in this process is used in the oxidization process.
NOx>N2+O2
Canister Vent (Cv) Solenoid Valve
U.S.A. And CANADA
Purpose, function
Seals the atmosphere side of the charcoal canister during EVAP leak check
monitoring.
Construction
Included in the charcoal canister.
...
Catch Tank Inspection
1. Remove the catch tank..
2. Plug the purge solenoid valve side into the catch tank.
3. Inspect for air leakage when blowing air using your mouth into the charcoal
canister side.
If ...
Other materials:
Start Stop Unit Configuration (Using Read/Write Function)
NOTE:
When performing configuration, it is necessary to read the vehicle specification
information from the start stop unit before replacing it. Connect the M-MDS
to the vehicle and perform vehicle identification before removing the start
stop unit. The vehicle specification informa ...
Battery Recharging [Skyactiv G 2.0]
Using GR8-1291:
(See GR8-1291 INSTANT TRAINING MODULE (VIDEO).)
WARNING:
Keep all flames away from the battery, otherwise evaporated gas from the
battery fluid may catch fire and cause serious injury.
1. Remove the battery filler caps and check the water level. If necessary, add
...
Steering Gear And Linkage
Purpose/ Function
The rotational movement input from the intermediate shaft is converted to
a linear movement in the horizontal direction of the steering rack by the rack
and pinion mechanism, and then transmitted to the tires and wheels.
Construction
A size and weight-redu ...
