ECM Fault?

[Akselrud, Boris]

But then what might cause acceleration enrichment at idle?

-----Original Message-----
From: Ludis Langens [mailto:ludis at cruzers.com]
Sent: Tuesday, December 07, 1999 11:37 AM
To: gmecm at efi332.eng.ohio-state.edu
Subject: Re: ECM Fault?


"Akselrud, Boris" wrote:
> 
> Are you absolutely sure that there can be any additional asynchronous
pulses
> in between?

Yes.

> I thought that enrichment is achieved in a normal way - by
> decreasing the time between pulses.

Power Enrichment is done the normal way.  But the "accelerator pump"
type enrichment is done asyncronously.

Regarding your other message, the ECM doesn't look for a MAP change as
part of the closed loop logic.


"Gregory A. Parmer" wrote:
> 
> > These pulses are the result of "acceleration enrichment".  Your ECM is
> 
> How much trouble would it be to have these extra pulses sent to
> a different output?  Or put another way...do you happen to know
> where in the '747 code this happens?

It would be possible to send them to a different output, but that would
require some serious hardware butchering.  Check my 1228746 schematic
for the signal "INJA".

It happens in the 747 code where bit %0000000010000000 gets pulsed in
the word at $BC3C.

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