david henningsson Posted April 1, 2018 Report Share Posted April 1, 2018 Hello. My friend has a v88 and when we measure 12v and ground it is ok on A. But on B we get 12v on the ground. Note. We have only connected A and B 12v + and grounded A. B is not grounded to car. And there we get 12v+ on the ground. ? Also has 12v out from inputs when harness is connected. The harness is correct now. But before it was connected vr sensor signal with 5 volt out to sensor and ground from sensor was connected to ground into v88. Did this brake the v88. When harness is connected to car it anv2-3 change to Anv at 5 volt. And measueres 12v anv2 on signal cable from v88. ? What is up with this. It is a home made pnp with original Bmw harness. M43. Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 1, 2018 Report Share Posted April 1, 2018 It sounds like there is something fried to me but @Simon knows the internal's better than me. He is on holiday for a couple of days but I will ask him to give his opinion on this one when he is back on Wednesday. Quote Link to comment Share on other sites More sharing options...
Simon Posted April 3, 2018 Report Share Posted April 3, 2018 First check with the ECU unplugged would be to check the resistance between the grounds on the B plug and the A plug. All grounds are on a common ground plain so there should be 0 ohms between them all. Quote Link to comment Share on other sites More sharing options...
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