[Diy_efi] Injectors Not Firing TESTER

Wed Oct 11 02:34:09 UTC 2006

This should help:

http://www.solorb.com/elect/solarcirc/pwm1/

Basically and 'clocking' source applied where R9 is in the circuit
(meaning you can ditch the entire left hand side of the diagram) drives
the FET... A morph of that subset is exactly what will be in my EFI
project when I get to that part...

On Tue, 2006-10-10 at 21:18 -0500, Clair Davis wrote:
> I'd kind of like to see a schematic for that, too.  555's and trans/FET's
> are BEYOND Greek to me...
> 
> Clair
> 
> 
> ----- Original Message ----- 
> From: "Charles Woock" <atomic at extendwireless.net>
> To: "Rick McLeod" <dunvegan at sbcglobal.net>; <diy_efi at diy-efi.org>
> Sent: Tuesday, October 10, 2006 9:02 PM
> Subject: Re: [Diy_efi] Injectors Not Firing TESTER
> 
> 
> > Do you have a schematic for this or know where it is on the web?
> >
> > Thanks
> >
> >
> > ----- Original Message ----- 
> > From: "Rick McLeod" <dunvegan at sbcglobal.net>
> > To: <diy_efi at diy-efi.org>
> > Sent: Tuesday, October 10, 2006 11:18 AM
> > Subject: Re: [Diy_efi] Injectors Not Firing...
> >
> >
> > to test, build a quick and dirty injector testor w/ a 555 and a power
> > trans/FET set up to slow rate pulse and hook up to the 'jector to see if
> it
> > squirts when the fuel log is presureized
> >
> >
> >
> >
> > ----- Original Message ----
> > From: Andrew Hopton <hoptona at gmail.com>
> > To: diy_efi at diy-efi.org
> > Sent: Monday, October 9, 2006 10:51:38 PM
> > Subject: RE: [Diy_efi] Injectors Not Firing...
> >
> >
> > Hi,
> >
> > Actually, 12v at both pins of the injector is good (provided eng is not
> > running) - because your multimeter is at least 1MOhm (and probably
> > 10MOhm) it provides no appreciable load, so you will measure 12v at both
> > sides of the injector's internal coil (there will only be a voltage drop
> > across the injector coil when current is actually flowing - i.e. when
> > the ECM grounds the 'cold' side of the injector.
> >
> > By seeing 12v at both sides of the injector coil, you have proved the
> > injector is not internally open-circuit (aka 'fried')
> >
> > Cheers,
> >
> > Hoppy.
> >
> > -----Original Message-----
> > From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
> > On Behalf Of Clair Davis
> > Sent: Tuesday, 10 October 2006 10:51 AM
> > To: diy_efi at diy-efi.org
> > Subject: Re: [Diy_efi] Injectors Not Firing...
> >
> >
> > Update...
> >
> > OK, the multimeter says I've got 12V at BOTH pins on the injector...  Me
> > thinks that's not so good, and probably not what VATS does.
> >
> > I also pulled the PROM out, mostly to verify to myself that I DID in
> > fact have it in the box, and judging by the scribbles on the chip, the
> > guy who programmed it probably DID do the right thing(s) with it.  I'll
> > shoot him an email and see what he can dig up on the project.
> >
> > In the mean time, I've got to do some digging myself and see what I've
> > done when hooking the system up.  There's NOT a separate wire for the
> > injector power, so I'm thinking it is worked in to some other junction
> > in the system. Time to go take some notes.
> >
> > Clair
> >
> >
> > ----- Original Message ----- 
> > From: "Marty Schmid" <marty67357 at yahoo.com>
> > To: "Charles Woock" <atomic at extendwireless.net>; <diy_efi at diy-efi.org>
> > Sent: Sunday, October 08, 2006 11:38 PM
> > Subject: Re: [Diy_efi] Injectors Not Firing...
> >
> >
> > > what prom are you using if it is camaro, moat likely vats has
> > > dis-abled
> > the injectors. you need to have a scan tool connected and look at the
> > vats, is it enabled or disabled
> > >
> > > ---------------------------------
> > > Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls.  Great
> > rates starting at 1?/min.
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> >
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