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Fig. 6.11 Oscilloscope trace from an EGR valve operated by duty cycle may make use of the electronic throttle control. Two types of valve are used to provide a computer controlled idle air supply. One makes use of a stepper motor, as shown in Fig. 6.12, and the other uses a solenoid operated valve as shown in Fig. 6.15.

Fig. 6.12 A stepper motor operated air valve
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