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Series 2 Diesel ECU Power


 
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riverrio



Joined: 24 Nov 2019
Posts: 4
Location: Seattle

PostPosted: Sun Nov 24, 2019 3:02    Post subject: Series 2 Diesel ECU Power Reply with quote

Hey all,

I have a 1998 2.8L Diesel. The check engine and glow plug lights don't come on and the car will crank, but it won't start. I've determined the problem is the main 12V wire that powers the ecu (which controls the fuel pump throttle and glow plugs) doesn't have 12v. If I manually connect 12V to this wire, she starts just fine and the lights come on as they should. †I've looked, but can't for the life of me find the fuse or relay that controls power to the ECU. Does anyone here know where that would be?

Much appreciated,
-River.
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PostPosted: Sun Nov 24, 2019 3:02    Post subject: Google Ads keep this community free to join!


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Lewis
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Joined: 25 May 2006
Posts: 15335
Location: Huddersfield

PostPosted: Sun Nov 24, 2019 10:59    Post subject: Reply with quote

Check the 80Amp Glow Plug fuse, on the small fuse bog attched to the battery +Pos terminal.

See this post for a photo and diagrams:- http://www.MDOCUK.co.uk/forums/viewtopic.php?t=42084

HTH
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riverrio



Joined: 24 Nov 2019
Posts: 4
Location: Seattle

PostPosted: Sun Nov 24, 2019 19:22    Post subject: Reply with quote

I tried that, and no blown fuses there. Is there an inline fuse somewhere?
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riverrio



Joined: 24 Nov 2019
Posts: 4
Location: Seattle

PostPosted: Mon Nov 25, 2019 0:08    Post subject: Reply with quote

I also seem to be lacking power to the transmission ecu as well. It's switched by a 4 pin relay next to the unit, but the relay doesn't have power. Any ideas?
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Lewis
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Joined: 25 May 2006
Posts: 15335
Location: Huddersfield

PostPosted: Mon Nov 25, 2019 10:42    Post subject: Reply with quote

Sorry no!

All the ECU's and relay's are listed in the post I linked to.

There is a set of manuals showing the electrical systems here:- https://drive.google.com/drive/folders/0B7mb6ykhrT40aXJxMnBCRnozWG8

HTH
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riverrio



Joined: 24 Nov 2019
Posts: 4
Location: Seattle

PostPosted: Wed Nov 27, 2019 0:08    Post subject: Reply with quote

Well, I found it, in case anyone has the same problems as me on a 1998.

On the link Lewis kindly shared, it shows "ECU power supply circuit" as No.5 in the engine bay, 10 amp ATO fuse. This fuse was fine for me. The fuse that did blow was the one labeled "engine intercooler fan" in the image. It's a 20A Jcase fuse. Apparently this fuse also controls the power supply cuircuit for the ECU and TCU as well?? Maybe just for the S2 delicas? In any case, I replaced it and it fixed my problems!

Thanks,
River
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CSMonkey



Joined: 05 Feb 2014
Posts: 291
Location: Exmouth

PostPosted: Wed Nov 27, 2019 15:10    Post subject: Reply with quote

Great news Smile
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