Re: IAC motors

[Ludis Langens <ludis@cruzers.com>]

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.

You need to sequence the current in the two coils like this:

 +12  +12
 +12  -12
 -12  -12
 -12  +12
 +12  +12
 ...

Or this way:

 +12  +12
 +12  open
 +12  -12
 open -12
 -12  -12
 -12  open
 -12  +12
 open +12
 +12  +12
 ...

Gm only uses the first sequence.  Reverse the sequence to move the
pintle the other direction.

To avoid earning a CSH, keep in mind that the IAC is also known as a
pintle launcher.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/

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