Citroen C5 Glow Plug Relay

Hello,

I recently became the proud owner of a Citroen C5 III RD >08, with a HDI 140 (DW10BTE) RH1 engine. Since the cold weather started, it's been difficult to start. I've been looking for the glow plugs. Next to the fuel injectors, there are what I would describe as circuit boards attached with M4 threads. When I tested them with a test lamp, with the ignition on, there was no power reaching them. I then wanted to check the relay, but unfortunately, I can't find it. Can anyone tell me where it is located?

It turned out that I wasn't checking the glow plugs, but rather the bracket for the injector wiring harness. On the 2.0 HDI, the glow plugs are located behind the engine, in front of the fuel injection system.
From above, it's accessible for working. The EGR valve, including the EGR cooler, needs to be removed. This, along with the subsequent glow plug replacement, is largely a matter of guesswork and working by feel or using mirrors. I'm waiting for better weather conditions. It's a time-consuming job, and I'll document it with photos. You can feel the glow plugs with your fingers. If you follow the wiring, you'll see that it leads to a relay/monitoring device, which is located near the connection between the engine and the transmission.

Okay, I'm going to try to describe how to change the glow plugs, with photo documentation. This might be helpful to some people. Since I'm quite skilled, but haven't worked as a mechanic for about 15 years, I would have appreciated something like this. Once again, thank you to Dieseltourer.

1. Remove the protective cover from the ADR cooler (Image 1). There is only one 8mm nut that needs to be loosened with a 13mm open-end wrench (SW) (1). Then, on both the outside and inside, there are clips (2) that can be used to slide the cover over the ADR cooler/water hose (Image 2).

2. Remove the two water hoses ( from the ADR cooler. (Image 3) Caution: Water may leak out.

3. Two 6mm nuts with a 10mm wrench size, located between the exhaust manifold and the ADR radiator (3). Then, an 8mm nut with a 13mm wrench size (4), as shown in picture 3.

4. Remove the 4 x 6mm screws (size 10 socket) from the silver pipe that connects to the intake manifold and the EGR valve (5). (See images 4 and 5). Then, remove the 6mm screw with a 6mm Allen key (6) from the underside of the EGR valve. Disconnect the electrical connector before removing the screws. Next, remove the 2 x 6mm screws (size 8 socket) from the EGR valve. (See image 5).

Now you can remove the radiator with the ADR valve. If that doesn't work, separate the two parts using two 6mm screws. It is recommended to use the gaskets PSA 1618FS for step 5 in image 5 and PSA 1618QS for step 3 in image 3. Although mine didn't have any, I had a kind of reddish adhesive instead. I will obtain the gaskets, as I don't have that kind of adhesive and I don't know what it's called.

Next, you carefully approach the candles. You'll need an 8mm socket wrench for the wiring nuts, and a 10mm socket wrench with a long reach (a standard 10mm socket won't work, it's too short). I used a 1/4" size in this case.

I thought the French had learned their lesson, but working on an XM 2.5TD was a nightmare, no matter what you had to do... sorry, I just had to get that off my chest.

I now understand why I stick with the lesser of two evils, which is a VW TDI.