| Subject: | Re: Update Re: Engine died, March 31 update and maybe ecu smoking gun? |
| From: | Alistair Bell |
| Date: | Tue, 31 Mar 2020 17:17:10 -0700 |
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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