110 TD5 wiring looms near ECU - including the loom coming from the injector harness

**Parker** · 28th May 2021, 04:05 PM

The previous owner fitted the last injector loom. Also placed some nice fleece to observe if oil is coming from there to the ECU. There was only a drop but some coming out of the connector in the rocker cover so I will change the injector loom I guess.

I did put pin ****** into the wires just below the connector to relieve any pressure coming from the injectors and prevent flow between wire and insulation. I read on the SA forum about this and it seems to make sense. If the oil comes out here rather than travel down the loom that surely must be a good thing.

BUT, I noticed and am confused about two things:
1. There is a 7.5A fuse connected to a brown and brown with stripe wire and both go to the thick loom that comes from the tunnel. What could that possibly be?

2. There is a blue connector unused next to the red one in the ECU. What could that be?

What is that IMG_0291.jpg 64387239721__FD7EDC7B-D819-41FD-84CE-81098141C786.jpg IMG_0290.JPG 64387245498__56DF0DB1-ECC0-4042-BCE4-46A162EC415E.JPG

**Parker** · 31st May 2021, 06:28 PM

Hi Folks

I know it's almost impossible to guess what that fuse is for so let's forget that and I take it out ans see if anything no longer works.

BUT...
...surely someone knows what that blue multi-pin plug is for?

Thanks

**Discofender** · 5th June 2021, 07:29 AM

Hi Parker,

The blue plug, isn't a plug, its a header which are just used to join parts of the loom. If you ever have the dash off your Td5 you'll notice a few more blue headers and I think some grey ones.

Haven't check the wiring diagram for a while but should be K109.

I have the same blue fuse covered in black tape in my loom so its factory, I haven't pulled it to see what cuts out. I was very careful with it when moving my loom/ecu into an ex-box.

Cheers Discofender

**jbe** · 6th June 2021, 07:31 AM

Your best guess would be having a look at the wiring diagrams in the workshop manual ;-).

**Parker** · 8th June 2021, 08:33 PM

Thanks Discofender,
brilliant, that Ex-box idea especially to move it to a relatively safe and accessible position. Alas no longer available it seems!
Amazing to have a fuse with an unknown purpose....wonder what chance I have of finding out!?
Wiring diagrams do my head in. I have tried, and with the various additions the previous 2 owners have made I have given up for now.

I bought a Traxide loom and am waiting to be brave enough to somehow run the thick wire from the battery except there are two under the seat and it is incredibly tight in there!

Thanks again!

Originally Posted by Discofender

Hi Parker,

The blue plug, isn't a plug, its a header which are just used to join parts of the loom. If you ever have the dash off your Td5 you'll notice a few more blue headers and I think some grey ones.

Haven't check the wiring diagram for a while but should be K109.

I have the same blue fuse covered in black tape in my loom so its factory, I haven't pulled it to see what cuts out. I was very careful with it when moving my loom/ecu into an ex-box.

Cheers Discofender

**Parker** · 9th June 2021, 08:23 PM

There are 11 connectors and this nicely identifies them:
Under Seat - Find Land Rover parts at LR Workshop

The purpose of the blue fuse (No 11) is still unclear.

**Max Headroom 2.3m** · 2nd June 2025, 12:01 AM

I know I am a bit late to the party but just for edification, the single fuse holder dangling in mid air is C0602 and contains Fuse 37 (blue 15A) which provides power from the Main Relay to that blue header dangling in mid air which is C0294 and is usually tucked in a black foam pouch. Blue header C0294 powers an ECU pin, most of the engine sensors, the EGR system, A/C & glow plug relay coils and earths some relays as well as the speedo sensor. Pulling Fuse 37 might make the engine run a bit wonky.

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110 TD5 wiring looms near ECU - including the loom coming from the injector harness

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