GM Fuel Pump control scheme

[Ludis Langens]

Vinnie Moscaritolo wrote:
> 
> the thing that bothers me is that if the ECU dies, then who runs the
> injectors,  I am confused
> if you lose the ECM then you lose the ECM...  so you system dies with
> a dead ECU whether or not
> the relay is working..?

When the digital CPU portion of the ECM dies, there is an analog circuit
in the ECM that takes over.  Hopefully this analog circuit is simple
enough to be bullet-proof.

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