do you know how to check continuity with a volt-ohm meter ?
essential to checking wiring harness continuity.
the less expensive ones, analogue, start at under 5 dollars- made in china
of course.
Digital volt-ohm meters, which are far more capable.......like for checking
oxygen sensor output .......
cost more of course.  Recently my 20 year old one died - Radio Shack's best
one was 70 bucks I think.
Scott
----- Original Message -----
From: "B.J.R." <beer_eighty@YAHOO.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, October 09, 2008 3:18 PM
Subject: Re: Technical question re: Injector firing signal

> Yeah, I mistaked too. I meant from the coil to ECU #1
> I tested the continuity in that wire, all good
>
> So how do I test for signal from coil to that terminal?
>
>
> ----- Original Message ----
> From: David Kao <dtkao0205@yahoo.com>
> To: vanagon@GERRY.VANAGON.COM; B.J.R. <beer_eighty@yahoo.com>
> Sent: Thursday, October 9, 2008 10:55:29 AM
> Subject: Re: Technical question re: Injector firing signal
>
> My Bentley manual shows that ECU pin #1 gets the signal from
> the coil. This signal from one of the terminals on the coil
> is actually connected to the pin #1 of the ignition control
> unit. I think Scott was referring to the wire between the
> terminal on the ignition coil and pin #1 of the ECU. If this
> wire is disconnected you will still get sparks but the ECU will
> not get the signal to fire the injectors. Scott probably has
> this kept in his brain. I have to look at the schematics to
> see this. That's a significant difference between an expert
> and a novice. I think ECU is normally very durable. It is the
> wiring that is more likely the cause of the problem.
>
> David
>
>
> --- On Thu, 10/9/08, B.J.R. <beer_eighty@yahoo.com> wrote:
>
>> From: B.J.R. <beer_eighty@yahoo.com>
>> Subject: Re: Technical question re: Injector firing signal
>> To: dtkao0205@yahoo.com, vanagon@GERRY.VANAGON.COM
>> Date: Thursday, October 9, 2008, 8:14 AM
>> thanks David.
>> But that is exactly what I ve outlined in my original post
>> I built my own Double relay, that part of the system has
>> been tested and functions properly.
>>
>> The ONLY thing I dont have is a signal to complete the
>> injector loop from the ECU, I have 12v to the injectors.
>>
>> So in an AIRCOOLED engine, where does the computer get the
>> signal to give the injectors the signal???& how do I
>> test it???
>>
>> If Im getting spark to all my cylinders, then the hall
>> distributor (AKA ignition control unit) is functioning
>> properly. yes or no??
>>
>> where does the ignition interface with the ECU???
>>
>>
>>
>> ----- Original Message ----
>> From: David Kao <dtkao0205@yahoo.com>
>> To: vanagon@GERRY.VANAGON.COM; B.J.R.
>> <beer_eighty@YAHOO.COM>
>> Sent: Wednesday, October 8, 2008 2:36:36 PM
>> Subject: Re: Technical question re: Injector firing signal
>>
>> You may want to check the two relays that are often the
>> cause of
>> this kind of problem, i.e. no signal to injectors. One of
>> them
>> is called fuel pump relay and the other power control
>> relay.
>> Do not swap the two with each other. Any of the two being
>> defective
>> can result in a same symptom. So you will want to find a
>> new one
>> then try to replace one at a time to identify the bad one.
>>
>> One of the two injector leads is supplied with +12v and the
>> other
>> will be grounded by the ECU when the ECU fires the
>> injector. If
>> the ECU is defective it may not be sending the signal to
>> ground the
>> 2nd wire of the injector. If you get sparks that means the
>> Hall Effect
>> Unit is working in sending the signal to the ECU. If the
>> ECU is not
>> defective then the two relays are more likely to be faulty
>> (one of
>> them).
>>
>> This was discussed many times before. Maybe this is why no
>> one
>> jumped out to point this out. Good luck.
>>
>> David
>>
>>
>> --- On Wed, 10/8/08, B.J.R. <beer_eighty@YAHOO.COM>
>> wrote:
>>
>> > From: B.J.R. <beer_eighty@YAHOO.COM>
>> > Subject: Re: Technical question re: Injector firing
>> signal
>> > To: vanagon@GERRY.VANAGON.COM
>> > Date: Wednesday, October 8, 2008, 11:04 AM
>> > I do not know.
>> >
>> > Could you be more specific?   IE: how do I test?
>> >
>> > Only wire I see directly to the ECU in the wiring
>> diagram
>> > is terminal #1 at the ECU.
>> >
>> > AND
>> >
>> > if there is no signal, does that mean bad Distributer
>> or
>> > bad signal generator (hall distributor)??
>> >
>> > Does it matter, because i believe ONLY entire rebuilt
>> > distributrors are available, not rebuild kits.
>> >
>> >
>> > ----- Original Message ----
>> > From: Eric Ley <eric_ley@hotmail.com>
>> > To: B.J.R. <beer_eighty@YAHOO.COM>
>> > Sent: Wednesday, October 8, 2008 9:45:22 AM
>> > Subject: Re:      Technical question re: Injector
>> firing
>> > signal
>> >
>> > do you have signal for the distrubitor ??? need to tel
>> the
>> > computer when to
>> > send signal to the injectors
>> >
>> >
>> > --\