'165 switching both fans from the ECM?

[Shannen Durphey]

Hi, Kevin.  I've been out for a couple of days.  I led you down the
wrong path...  Some tuning software has values for fan on/off temps
for primary and secondary fans.  I looked at this and glanced at the
ecm pinouts to look for 2 fan connections, never chasing things beyond
that.  I can't see any way that the ecm controls the heavy duty fan
after looking through the schematics.

Shannen

Kevin Crain wrote:

> Looks like D11 is actually sampling the AC pressure switch for continuity
> to ground.  This is the case on '88, '89 Vette, and '86 F-body pinouts in
> my Helms and the diy-efi incoming directory.  It uses this input to
> determine whether the AC compressor is running, setting the flag for all
> the "AC pressure high" options.  Looking at the Helms manual, D11 shows up
> as strictly an input path.
> 
> This creates a new mystery...how do BUAs control the aux fan?  There's
> logic for it in the .bin but I'm not finding an ECM pin where they drive it.
> 
> Hmmm....
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