Mazda 2009 5 Informations techniques Page 62

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Emission System WL-C Engine
Intake Shutter Valve
The WL-C engine uses a three-step ISV, which increases the EGR rate at low engine
speeds and prevents bucking movements of the engine during shut-off. The operation is
similar to the ISV used on the Mazda6 pre F/L (2.0 MZR-CD).
BT-50_01026
1 Fully opened at normal driving (for low
EGR rate or no EGR)
4 First vacuum actuator operates for high
EGR rate and shortly when the engine is
shut off
2 Fully closed when the engine is shut off 5 Second vacuum actuator operates
shortly when the engine is shut off
3 Slightly opened to create vacuum (for
high EGR rate)
NOTE: Function and operation of the ISV are as described for the Denso common rail
system in the course ‘Basic Diesel Engine Management’ (CT-L2005).
01-38 Service Training BT-50
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