Congratulations!

A little perseverance and attention to detail can make all the difference.

Mark

Alistair Bell wrote:
> 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
>>>>>
>>>>>>>
>