morrisdan613 · Feb 28, 2020

Hi guys I have a 2004 td4 2.0 diesel. Can anyone point me in the right direction for the glow plug relay? Can't seem to locate it. Anyone have a picture of where it is so I can check it? Thanks

Nodge68 · Feb 28, 2020

There isn't one. Being a relatively modern diesel, the TD4 uses a glow plug control module, which is under the inlet manifold.

Why do you want to know?

morrisdan613 · Feb 28, 2020

Nodge68 said:
There isn't one. Being a relatively modern diesel, the TD4 uses a glow plug control module, which is under the inlet manifold.

Why do you want to know?

Hi 2004Freelander 2.0 diesel trouble starting when engine is cold. Takes a few cranks to get started. Cloud of smoke then runs fine. Starts no problem when engine is warm. Changed all the filters, crankcase breather and camshaft sensor. Was told it may be the relay not heating the plugs up enough to start

Nodge68 · Feb 28, 2020

morrisdan613 said:
Anyone have a picture of where it is so I can check it?

It's arrowed red here. Note the inlet manifold is removed in this picture.

andyfreelandy · Feb 28, 2020

The Electronic Diesel Control system determines how long to keep the plugs on. There is a relay which follows instructions from the EDC. The relay is in the black L shaped box behind the battery. Will add photo from Haynes. The thick brown wire is a good place to check you are getting a feed when engine cold.
If there is a feed and cold starting is bad you'll need to whip the inlet manifold off and resistance check the glow plugs.

Nodge68 · Feb 28, 2020

morrisdan613 said:
Was told it may be the relay not heating the plugs up enough to start

If the glow plug light is coming on, then it's more likely to be the glow plugs, which are wearable items.

morrisdan613 · Feb 28, 2020

Nodge68 said:
If the glow plug light is coming on, then it's more likely to be the glow plugs, which are wearable items.

I have changed all the glow plugs and still the same issue

morrisdan613 · Feb 28, 2020

andyfreelandy said:
The Electronic Diesel Control system determines how long to keep the plugs on. There is a relay which follows instructions from the EDC. The relay is in the black L shaped box behind the battery. Will add photo from Haynes. The thick brown wire is a good place to check you are getting a feed when engine cold.
If there is a feed and cold starting is bad you'll need to whip the inlet manifold off and resistance check the glow plugs.

Ok thanks I'll check the feed

andyfreelandy · Feb 28, 2020

Black box and relay. Solid coloured thick wire, brown, is feed to glow plugs.

morrisdan613 · Feb 28, 2020

andyfreelandy said:
View attachment 201779
Black box and relay. Solid coloured thick wire, brown, is feed to glow plugs.

Thank you mate will check this out

Nodge68 · Feb 28, 2020

andyfreelandy said:
There is a relay which follows instructions from the EDC. The relay is in the black L shaped box behind the battery

Are you sure Andy? The glow plug fuse (fuseable link type 40A IIRC) is in the fuse box, but I'm sure the control module handles the switching current. Of course I'm always happy to be corrected.

andyfreelandy · Feb 28, 2020

On all TD4s I have seen, the relay is as per Haynes, photo above and the box that is under the inlet manif purely holds a connector for the incoming feed and the 4 plug feeds.

I have also used the relay as a test point so it certainly exists!! Maybe a change during production?

morrisdan613 · Feb 28, 2020

andyfreelandy said:
On all TD4s I have seen, the relay is as per Haynes, photo above and the box that is under the inlet manif purely holds a connector for the incoming feed and the 4 plug feeds.

I have also used the relay as a test point so it certainly exists!! Maybe a change during production?

Would this be the relay?

Nodge68 · Feb 28, 2020

morrisdan613 said:
Would this be the relay?

It's definitely a relay, and the cables are heavy enough to be for the glow plugs.

Looks like every day is a school day for me.

andyfreelandy · Feb 28, 2020

morrisdan613 said:
Would this be the relay?

Das the one!!!

andyfreelandy · Feb 29, 2020

Hi John, Looks like there was a similar discussion in Aug 19. Felt a bit deja vu!!

↑I said...
On my 2002 Td4 there is a relay for the glow plugs in the Lshaped ecu box
You said....
That's interesting. There isn't on my 2005, unless I've missed it.

Nodge68 · Mar 1, 2020

andyfreelandy said:
On my 2002 Td4 there is a relay for the glow plugs in the Lshaped ecu box
You said....
That's interesting. There isn't on my 2005, unless I've missed it

I've slept a few times since then.

I'm still pretty sure there isn't a relay in my Environmental protection box, although I've not actually looked for it.

Most of my work in the E box has concentrated around the TCM, which is still ongoing.

telindnor · Oct 25, 2021

I do have the same problem. I have also changed the glow plugs, but it seems like they have no function. I´ll check the brown wire, and will look for the relay asap. BUT, if it seems like the relay is an issue, where can I get a new one? Regards Terje-Norway

ggrupea · Nov 6, 2021

Hi all, I need to reborn this conversation, my td4 Freelander 2005 have a cutted wire on the module of the picture, as you can see on image. Can someone help me knowing where this wire have to be connected?

Best wishes

GrumpyGel · Nov 6, 2021

ggrupea said:
Hi all, I need to reborn this conversation, my td4 Freelander 2005 have a cutted wire on the module of the picture, as you can see on image. Can someone help me knowing where this wire have to be connected?

Best wishes

I don't know the TD4 - but I'd guess it connects to the other cut wire.

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