730 and Fan request drive circuit/

[Ludis Langens]

Vinnie Moscaritolo wrote:
> 
> Then I though about maybe grounding the COOLING FAN signal at E8 of
> the ECU,  but I am concerned the DELCO 16042368 which drives this
> signal...  does anyone know what the characteristics of this chip is?
> can you ground the output pins  without risking failure, or do I need
> to attach a couple of diodes?

Grounding the ECM's output won't hurt the quad driver chip - but it may
cause the software to flag a quad driver fault.  The newer quad driver
chips compare their output and input signals.  If there is a mismatch,
they signal a fault.  The ECM software can read that signal.

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


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