Originally posted by haaken675
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EDIT and let me explain why. The Fidle output has ZTX451 transistor which can drive up to 1 amp of current. If I remember correctly the ICV coil resistance is something about 10 to 20 ohms so the current at 14 volts can be dangerously close that 1 amp maximum or even more. That's why you need to use some other output that has more current driving capability.
The flyback diode is another thing that is needed many times when you need to switch current on/off from coil (like boost solenoid, relay, ICV valve etc.). Here's good explanation of that: https://www.youtube.com/watch?v=LXGtE3X2k7Y
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