ECM Fault?

[Don.F.Broadus at ucm.com]

Alternator ripple, bad injector transistors in the ECM, Bad  clamp diode on
the injector driver transistors, 

> -----Original Message-----
> From:	David Cooley [SMTP:n5xmt at bellsouth.net]
> Sent:	Monday, December 06, 1999 3:06 PM
> To:	gmecm at efi332.eng.ohio-state.edu
> Subject:	RE: ECM Fault?
> 
> I think you need to look at the inputs... TBI injector outputs won't have 
> any extra pulses unless something is making the ECM generate them.
> I think you said before the MAF or MAP wire was bad.  May have more bad 
> wires, specifically grounds.
> 
> At 03:43 PM 12/6/1999 -0500, you wrote:
> >There is nothing, it's a bare stock vehicle with all original parts.
> >
> >-----Original Message-----
> >From: Peter Gargano [mailto:peter at ntserver.techedge.com.au]
> >Sent: Monday, December 06, 1999 3:16 PM
> >To: gmecm at efi332.eng.ohio-state.edu
> >Subject: Re: ECM Fault?
> >
> >
> >What other electronic devices have you installed in your vehicle.
> >Phone? CB? Security device(s)?  What standard parts have you taken off?
> >
> >Akselrud, Boris wrote:
> >
> > > looking at the signal with an oscilloscope is that there is an
> additional
> > > abnormal impulse approximately 0.1 .. 0.3 ms wide in between the
> normal
> >
> > > As you probably remember I am dealing with 1993 Cadillac fleetwood 5.7
> TBI
> >
> >--
> >PG
> 
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> David Cooley N5XMT Internet: N5XMT at bellsouth.net
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