Re: IAC motors

[Shannen Durphey <shannen@grolen.com>]

There are IAC drivers/ testers available for around $30.  Also, you
can fool the ecm into moving an IAC by providing a tps signal around
.6V (easy way is connect a handheld tps) then opening or closing
throttle with the engine running.  The ecm thinks it's idling, and
moves the IAC to reduce or increase idle speed.
Shannen

steve ravet wrote:
> 
> Ken -- the IAC motor is a stepper motor, which requires pulses to be
> given in a particular sequence to the different wires in order to move
> the spindle.  There are different types of steppers, and I don't know
> what kind the IAC is, so I can't tell you anything further, other than
> to check out this WWW page which has lots and lots of info about stepper
> motors.
> 
> http://www.cs.uiowa.edu/~jones/step/
> 
> --steve
> 
> Ken Kelly wrote:
> >
> > What do these things work on? PWM? I want to be able to test them out and
> > move the pintle back and forth. (Standard 4 pin TBI/TPI IAC's for GM, of
> > course.) Somewhere I could've sworn I saw where you just poke two terminals
> > with +12v, but that doesn't seem to work.
> >
> > Ken Kelly (#2)
> >
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> --
> Steve Ravet
> steve.ravet@arm.com
> Advanced Risc Machines, Inc.
> www.arm.com
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