Diesel Engines Engine
• In order to remove any deposits from the ISV a cleaning mode is activated each time the
engine is shut off. Therefore, the PCM actuates the ISV so that it is moved from the fully
open position to the fully closed position several times. This process takes approx. 10 s.
• The PCM controls the DC motor by a duty signal 0 V/12 V.
NOTE: If the ISV system fails, the ISV stays in the open position in which no vacuum is
produced.
• The ISV position sensor is integrated in the cover of the valve body and detects the ISV
position by a Hall-type sensor. The sensor consists of a stator with Hall element and a
magnetic rotor joint to the driven gear.
M6FL_01082
1 ISV position sensor 2 PCM
• When the magnetic rotor rotates, a voltage is generated in the Hall element. As the Hall
voltage is very low, it is amplified in the sensor and input to the PCM.
NOTE: After the ISV is replaced, its adaptation values in the PCM must be reset and the ISV
position sensor initialized (refer to the section “Control System, Service and Repair”).
01-58 Service Training Mazda6 Facelift
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