Unipolar stepper motor - valve, which performing element is the unipolar stepper motor. It only
requires the power supply during the change of the stepper motor position
3 Wire PWM – valve using two windings (e.g., Bosch 0280 140 505). When it is not powered, it is
in the middle position. Depending on which winding is powered, the valve will get more closed or
opened.
DBW – idle control is performed by electronic throttle. In this case the Idle ref table sets the throttle
position by scaling of DBW Idle Range parameter.
Ignition cut - idle is controlled by regulating executed spark percent with Idle ign. cut table.
Page 96
G1
2
G4
G1
7
G2
4
B24
EMU
G3
G2
G10
G11
G17
G24
B24
Sample connection of unipolar stepper motor
+12V
+12V
EMU
Sample connection of 3 wire PWM valve with flyback diode
+12V
+12V
+12V
G17
G24
B24
G12
G13
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