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! Guide ! How To Fit A Tuning Box To A Fiesta Mk7 1.6Tdci 95Ps

! Guide !

How to fit a Tuning Box to a Fiesta Mk7 1.6tdci 95ps

Firstly thanks to Lez, Tone and Cliffhanger who all responded to my request for help in fitting a tuning box.

In particular to Lez who supplied a couple of pictures that I have used within this guide.

Firstly my reason for going for a box rather than a remap is simply the fact that I have not found anyone that can remap the 95psi version.

There are loads of tuning boxes available, the one I have fitted was from tdi-tuning.co.uk and from what I can tell they all connect in the same way.


Which ever box you go for I'd strongly recommended you also by a blanking cap. Once you have fitted the tuning box its really easy to access the box itself, but to remove the cabling you will need to repeat the fitting process. By using a cap you can take the box out and replace it with the cap, which then returns the car to normal, but the cables remain. This is the one that goes with my box.


Anyway fitting the box is not the 10 minute job that the sellers quote as the common rail is not situated at the front of the engine but behind it.

The picture below (from Lez) shows what the engine looks like from behind and the red circle is where the common rail is.


The following is a guide of how I fitted mine, which will hopefully prove useful to members looking to fit a box to their fiesta.

• Tools needed – Socket set, Set of Alan Keys. Optional – Torch and screwdriver

• Time – 1 to 2 hours

• Mechanic skill level – Low (I have none!)

Step 1 – What needs to be removed – the Battery!


There is no way to get at the common rail plug without making some space. The only thing that needs to be removed in the Battery and the case it sits in (green cross).

However the ECU is also secured to the battery case (white cross) so we will also need to detach this from the battery case.

The red cross I believe is the air filter and some posts I've read people say you have to remove this as well. I managed to avoid this.

Step 2 – Remove the Battery


Disconnect you battery and remove the 3 bolt circled in red. The battery can then be removed.

Step 3 – Detach the ECU from the plastic battery case.


There are 3 screws that need to be removed in order to detach the ECU from the battery case.

The first is easily accessible – circle in red. Also it's a good idea to move the rubber tube (blue dot) at this point.

The second two screws are actually underneath the case itself and are a bit of a pain to get to.


Remove the 3 bolts securing the battery case – circled in red. The two yellow dots are approximately where the screws are underneath.

This was one of the hardest bits to figure out as there isn't enough room to easily get at them.

However the box is plastic and will give a little so with a bit of twisting and pulling I got it out this much.

The two red dots are where the screws are underneath and the green arrow shows the gap I used to get at them.


The picture below is a slightly confusing as I put my camera underneath and took a picture.

The red arrow points to the top of the battery case and the two red circles show the screws.

Using a alan key you can loosen these two enough before using your hand to unscrew them totally – take care not to drop them!


Once these are out the plastic box can be removed. The ECU can then be moved out of the way (picture below)- the yellow arrows shows where to move it. For info the red circles show where those two tricky screws were. The Blue dot shows where to look for the next step.


Step 4 – Access the Common Rail

Finding this connector perhaps the hardest thing about fitting the tuning box as even now you can't really see it.

You have to put your hand behind the engine and feel for it. The picture below shows exactly where to put your hand to find it.

It's my hand in the picture and the tips of my fingers are touching the connector.


I managed to get the connector out using just my hand – practice with the cable that came with the tuning box to understand how they work.

Once off the cable connector itself is red in colour.

You can now connect your tuning box!!!

Before putting everything back I secured the box – at the moment I've put it just above the washer pump.

Once it was secured I reversed the process to put everything back together.

Hope it helps!

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