VSS

[T Hergen]

Putting a capacitor between pin 3 of the 555 and the vss input of the ecm
may work.

On Wed, 12 Aug 1998, peter paul fenske wrote:

> Hi Bruce
> 
> Forgot to mention the standard VSS input for most apps
> is a zero crossing detector. You need a A.C. signal to trigger
> it..
> 
> :peter
> 
> At 11:06 AM 8/12/98 -0400, you wrote:
> >
> >-----Original Message-----
> >From: TBK <terryk at foothill.net>
> >To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> >Date: Wednesday, August 12, 1998 10:52 AM
> >Subject: Re: VSS
> >
> >
> >>I've driven my 7730 with an oscillator at about 10V pk-pk Bruce.  A
> >standard
> >>4 pole VSS won't trigger it?
> >>TK
> >
> >Well, per off line letter tried feeding it a distributor signal, just from
> >the
> >pickup coil, and doing that gives me a vss signal.  Was using a 555 and for
> >some reason, a DC pulse wouldn't trigger it, Hmmmm.
> >Cheers
> >Bruce
> >
> >that didn't work???????.
> >>-----Original Message-----
> >>From: Bruce Plecan <nacelp at bright.net>
> >>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> >>Date: Wednesday, August 12, 1998 6:09 AM
> >>Subject: Re: VSS
> >>
> >>
> >>>
> >>>-----Original Message-----
> >>>From: Richard Wakeling <kojab at ar.com.au>
> >>>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> >>>Date: Wednesday, August 12, 1998 1:07 AM
> >>>Subject: Re: VSS
> >>>
> >>>
> >>>>Hi Bruce,
> >>>> What ECU are you testing below. Is it the 808 or 747?
> >>>
> >>>Ooops, it's the 1227730
> >>>
> >>>>If it is the 808, could it be that your scanner is giving you the wrong
> >>>>info. What scanner are you useing on the 808?
> >>>
> >>>Haven't gotten that far yet.
> >>>>Cheers Richard
> >>>>
> >>>>Bruce Plecan wrote:
> >>>>>
> >>>>> OK, on the bench ecms.  No matter what memcal, the scanner sees
> >>>>> no MPH, and the TCC is always on.  Gear switch doesn't change it
> >>>>> or 4th gear apply switch.
> >>>>>     Sounds like a bad ecm, maybe?.
> >>>>> Any thoughts?, I've checked the wiring several times and everything
> >>>appears
> >>>>> right..
> >>>>>     Kelp
> >>>>> Bruce
> >>>>
> >>>>
> >>>
> >>>
> >>
> >>
> >
> >
> >
>