| Subject: | Re: Update Re: Engine died, March 31 update and maybe ecu smoking gun? |
| From: | vw_van_fan_Mark |
| Date: | Tue, 31 Mar 2020 17:31:38 -0700 |
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 >>>>> >>>>>>> >
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