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Razler

Member Since: 16 Nov 2013
Location: NORTHUMBERLAND
Posts: 50

TD5 ECU EARTHS

Hi,

My Nanocom keeps loosing connection with the ECU, have been told that it could be a earth problem to the ECU or the OBD connector so I have cut the two wires that join onto the connector and joined them onto a wire that goes straight to the battery neg.

Can anyone tell me what wires on the ECU connectors are the ECU earths? I have replaced the ring terminal that did bolt down to the battery box and connected it to the fuse box mount bolt.

Once I know the ECU earths will run a cable straight to the neg terminal on battery.

Cheers

19th Apr 2014 2:03pm

Macpaul

Member Since: 26 Mar 2013
Location: SW Surrey
Posts: 439

2013 Defender 110 Puma 2.2 USW Loire Blue

Pages 2 and 3 of the Lucas ECU pdf available from Nanocom might be of help but it's not a straightforward answer from what I can see.

http://nanocom-diagnostics.com/downloads/1177665786.pdf 2003 Td5 110 Hardtop
Now a 2013 110 USW too.

19th Apr 2014 4:45pm

Razler

Member Since: 16 Nov 2013
Location: NORTHUMBERLAND
Posts: 50

Thanks a lot macpaul..

Yeah why is there never an answer that jumps out of the page at me?!

Had a look though and cant see any obvious ECU earths on that pdf, surly there must be a earth point on the engine, chassis or does it earth through its body or is the ring terminal under the ECU is main earthing point.. Any ideas anyone?

22nd Apr 2014 7:40pm

Macpaul

Member Since: 26 Mar 2013
Location: SW Surrey
Posts: 439

You're welcome.

I've been told by those that know that the earth for the ECU is indeed the black wire coming from the main bunch (red plug?), that terminates in the ring fitting that is is screwed to the stud at the bottom of the underseat box. Not the case itself.

If the earth straps around the vehicle aren't great to this box, resistance can be created.

Either test any resistance by using a multimeter from the -ive terminal on the battery to the stud in the box (not poss with my multimeter - too far) or by running a cable direct from the battery to the stud. You can just jury rig it and drape the cable across the seats to start with to see if it helps and if it does, do it permanently on the underside.

Which is what I did.

From what you say, my money's on it being another fault but good luck and let us know how it goes.

Simon. 2003 Td5 110 Hardtop
Now a 2013 110 USW too.

22nd Apr 2014 9:35pm

landyman37

Member Since: 22 Jan 2012
Location: west midlands
Posts: 153

I am sure the earth for the ecu and the earth for the obd socket terminate at the same place in the seat box I am not too sure if they go to the header under the seat box or not I have had a few of these headers apart with quite a lot green in them.

Phil

24th Apr 2014 10:22am

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