ECM Fault?

[Bruce Plecan]

----- Original Message -----
From: Akselrud, Boris <AkselruB at moodys.com>
To: <gmecm at efi332.eng.ohio-state.edu>
Sent: Tuesday, December 07, 1999 1:15 PM
Subject: RE: ECM Fault?


| But then what might cause acceleration enrichment at idle?

Poor TPS connection/sensor (I do beleive there are some electronics in it)..
Grumpy
|
| -----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/
|