[Diy_efi] Injectors Not Firing TESTER

Wed Oct 11 13:28:50 UTC 2006

I posted an injector driver circuit on The Twiki page. Adjustable for 0-10 msec pulse width, 
555 trigger or external pulse (pip for Ford systems) Can drive 2 12 ohm injectors per channel for a total of 4 injectors batch fired. Change the output transistor for more current. 

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of Charles Woock
Sent: Tuesday, October 10, 2006 9:03 PM
To: Rick McLeod; diy_efi at diy-efi.org
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
>
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