Dead driver on '165? - Fixed

[CSH-HQ]

Just wait til you post a question, and someone reminds you that you'd 
researched it and posted the answer a couple months ago.....
Grumpy
  Just found out M Stewart doesn't like pizza, so much for her Thanksgiving 
day invite to CSH, HQ


>Nothing like a day or so of thinking about the problem.
>
>Re-read the schematics, the park/neutral line is in park when it's low
>(ground) not high, oops but no difference.  I thought about what Scot said
>about the driver, did a little looking in a MOSFET book and realized that
>it GROUNDS the injectors, not powers them.    I was confused initally
>because the B+ wire to the injectors (ckt 839 and 639) is black which in my
>mind implied a ground circuit.
>
>Gee, where do the injectors get power FROM?   Pins B & G of C207, which
>splits off the harness at the ECU and goes to underdash and fuse panel.
>Duh, they're hanging free.... 
>
>Hooked them up to B+, turned the dist, and click-click-click.    Nothing
>like the sweet smell of stale gas coming from injectors that have been
>laying around.  ;^>
>
>One side note about VATS.  Seems that this ECM and CAL (ABYA 5400) does not
>have VATS.   It makes no difference if my VATS eliminator is hooked up or
>not, even after it has sat powered-down for several minutes.   So either
>I've got some oddball cal or the car never came with VATS.   This is
>assuming that no vats == no injector drive at all while cranking.
>
>Once I finally get a prom reader/burner I'll do further investigation, and
>of course  upload the bin....
>
>Thanks for your help guys.    I almost feel unworthy asking questions when
>they end up with such dumbass answers.....
>
>At 10:03 PM 10/26/99 -0400, you wrote:
>>Got a scope, good.  Take the ECM cover off and take a look at the signal 
>>on the gate of the output driver.  The one with the big hunk of metal
>>attached to it.  If you have a signal, things are good up to there.
>>Missing ground, burnt out driver?  There is only one driver in that
>>ECM.
>>
>>Scot Sealander
>>
>>
>