IAC bi-polar stepper motor wiring

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
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Richard Hill
MegaSquirt Newbie
Posts: 2
Joined: Tue Dec 20, 2011 11:35 am

IAC bi-polar stepper motor wiring

Post by Richard Hill »

Hi all, I've got a MS2 v3 and an inlet manifold assembly from an MGF which has a 4 wire bi polar stepper motor to control idle air flow, I've measured a resistance of 56 ohm for each of two separate coils.

Can't delay the moment any longer and I'm finally in the process of creating the wiring harness, my question is simple, the MegaManual says the IAC coils are connected to DB37 pins 25 and 27 for one coil and 29 and 31 for the other, does it matter which end of which coil goes to which pin on the DB37, or is this sorted out in the calibration process? My only information on my stepper motor is the resistance between the two pairs of wires.

Thanks :)
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trakkies
Super Squirter
Posts: 1162
Joined: Tue Dec 30, 2008 3:06 am
Location: SW London, UK

Re: IAC bi-polar stepper motor wiring

Post by trakkies »

If it works in reverse, swap the connections to one winding.
Dave P, London UK.
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
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Richard Hill
MegaSquirt Newbie
Posts: 2
Joined: Tue Dec 20, 2011 11:35 am

Re: IAC bi-polar stepper motor wiring

Post by Richard Hill »

Thanks, I'll give that a go, didn't want connect up and get the 'blue smoke of death' from my MS2
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