Date: Tue, 31 Mar 2020 17:17:10 -0700
Reply-To: Alistair Bell <albell@SHAW.CA>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Alistair Bell <albell@SHAW.CA>
Subject: Re: Update Re: Engine died,
March 31 update and maybe ecu smoking gun?
In-Reply-To: <f3ea8199-bce3-9d91-4c0b-69ce467d8bfd@cox.net>
Content-Type: text/plain; charset=utf-8
It worked!
Thank you very much mark for all your help.
Alistair
> On Mar 31, 2020, at 5:04 PM, vw_van_fan_Mark <madvws@cox.net> wrote:
>
> No, bottom left is pin 25.
> Pin 25 is the ignition coil trigger from it's driver transistor.
> That check mark for the middle pin of the transistor appears to show that your bad solder joint is for the pin 25 signal as hoped.
>
> Mark
>
> Alistair Bell wrote:
>> Ok, did that.
>>
>> And apologies for the confusing way I noted results.
>>
>> The board tested in orientation shown, the red tape and black marks
>> refer to the pin orientation and results.
>>
>> From pin mark outwards, too and bottom, check mark means continuity,
>> check plus asterisk means brief continuity. Dash mark means no continuity.
>>
>> Started with transistor leg on right. Marks on tape closest to pin
>> marks. Working ext was middle leg, and finally left leg.
>>
>> I think, if I’ve rotated things in my head correctly, the pin marks are
>> too left 13, top right 1
>> Bottom left 14 , bottom right 25
>>
>> If that’s right, nine of your suggested pins have continuity to any of
>> the legs of the trans.
>>
>> https://shufti.files.wordpress.com/2020/03/3e721a30-3d1c-42e2-9f2a-192eb14ad5a1.jpeg
>>
>>
>> The transistor as I measured, right leg first, then middle then left
>>
>> https://shufti.files.wordpress.com/2020/03/cb7b8634-ac9f-4345-b857-3a8a061a9e54.jpeg
>>
>>
>> Ab
>>
>>
>>
>>
>>>> On Mar 31, 2020, at 4:17 PM, vw_van_fan_Mark <madvws@cox.net> wrote:
>>>
>>> For fun you could use an Ohm meter to see if that transistor connects
>>> to the ECU pin that drives the ignition coil.
>>> Put a meter probe on each of the three legs in turn and test the ECU
>>> pin(s) with the other probe.
>>>
>>> I would look at ECU pins 25, 12 3
>>> to see if any leg of that transistor connects to any of those pins.
>>>
>>> The driver transistor for the fuel injectors is the one I'm used to
>>> seeing a bad connector at.
>>>
>>> Mark
>>>
>>> Alistair Bell wrote:
>>>> That black component that had the one leg solder joint broken is BUV37B
>>>>
>>>> Looked up and it’s , if I read it right, a power transistor.
>>>>
>>>> Alistair
>>>>
>>>>>>
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