I will appreciate someone help with ECU pinouts for the 2005 and 2006 Skoda Fabia 1.4 vehicles. I bought an auctioned 2005 model without an ECU and got a Magneti Marelli 2006 ECU which does not seem to work with the 2006 Fabia.

 

With the new ECU plugged in and switch on ignition the Speed dash does not display the expected initial EPC, Power Steering and Battery indicators but when the ECU is disconnected and switch is on ignition position these indicators come on.

 

I have been trying to resolve this for about 1 week so I will appreciate any assistance I can get.

 

I have VCDS but it is unable to communicate with the ECU when plugged in to the scanning port.

I think the engine ECU needs to have its immobiliser set to match the vehicle it is fitted into, doesn't it?

 

What is the engine code of the car (BBY, BKY, BBZ?). Does the car have manual or automatic transmission? What is the part number of the ECU that you have bought?

Thanks Wino.

The car is a 6Y (2005 Fabia 1.4L 16V Petrol).

 

With support from 2 friends I finally got the ECU wired to the car and immobilizer setting done,

 

Now car starts and runs along but I am unable to query the Engine module while I am able to query all others including the ABS, HVAC, Airbags & Immo.

 

I also noticed there is no power supply to the radiator cooling fan.

 

VAG communication with engine control module fails completely.

 

I see no code for why the radiator cooling fan is not running but I tested the fan directly to the battery terminals and it runs very well.

 

Did we mixup 1 or more wires cabling the new ECU to the car?

On ‎29‎/‎09‎/‎2018 at 08:09, Wino said:

What is the engine code of the car (BBY, BKY, BBZ?). Does the car have manual or automatic transmission? What is the part number of the ECU that you have bought?

I can't help with wiring information without more answers to these questions. there are different wiring diagrams for different engine codes, all of which fall into the same general description "Fabia 1.4L 16V Petrol".

 

Part number of the ECU will be printed on a label on the lid of the thing.

 

Engine code is a 3-letter code that will appear on a sticker on the upper cambelt cover, and also on the car data sticker on the floor of the boot.

 

 

Hi Wino,

It is the Magneti Marelli with part number 036 906 034 FF.

It is a 6Y engine. 

Many thanks for your support.

 

Engine code is a 3 letter code.

On the boot floor or in the service handbook.

It is a BBZ

I will try to find some time tomorrow to look at circuit information for you.

Thanks Wino.

Quite appreciate the sacrifice of your time & resources supporting newbies like me.

For the fan non-function, check fuses on top of battery if you have not already.

Strip fuse 5 or 3 (40A) for high speed function (red/black wire position 5 or 3 depends on build date),

Blade fuse 8  (30A, under plastic cover near strip fuses) for low speed function. 

Worth also checking blade fuses 9 and 11 (5A, red/purple wire, position depending on build date).

The cooling fan isnt controlled by the engine control module.

That ECU part number is one of only two that I can see for BBZ engines, and doesn't seem to be year-dependent.

The suffix-FF part is for EU2 emissions standard vehicles, the alternative one is suffix -DF which is EU4 compliant. See here, item 1 (last listing of item 1 and fifth from last).

 

In the 'data model' column you can see BBZ, but also 0GG or 0GV. The first one means EU4, the other means EU2.  Check that your car's data sticker (example photographed by @LB123 helpfully above) says OGV which would confirm that you have the right variant of ECU fitted.

 

Because there are no date ranges shown, and the linked page above shows the same two possible part numbers when I get to it by specifying either a 2005 or 2006 car, I would say that the ECU pin assignments haven't changed between those years.

So I think the answer to your question "Did we mixup 1 or more wires cabling the new ECU to the car? " is probably no.

 

I realise that this doesn't help to solve the non-communication problem very much. 

I suppose checking that the CAN wiring is OK would make sense.  I will try to find pin numbers for those connections next.

 

I always had trouble talking to my marelli ECU, try starting the car then connecting.

CANH connection from engine ECU pin 60 (orange/black wire) goes to pin 8 of the 32 way connector on the back of the instruments/clocks and to pin 5 of connector XS6 of the onboard supply control unit under the relay panel (and lots of other modules).

CANL connection from engine ECU pin 58 (orange/brown wire) goes to pin 7 of the 32 way connector on the back of the instruments/clocks and to pin 3 of connector XS6 of the onboard supply control unit under the relay panel (and lots of other modules).

 

Check continuity of each from ECU connector to one of those destinations.

Thanks Wino. I will check out the pin connections from the ECU CHAN signals to the other interfaces as advised later today and update.

 

@sepulchrave I have tried that. I just never get any connection to the engine control module but I do get connected to all other modules so I guess it is a wiring mixup or broken cabling between the ECU and the other interfaces.

Hi Wino, please where is the onboard supply control unit and the relay panel you are referring to located?

 

I have noticed the coolant fan does not work too and I suspect some relays somewhere might be responsible.

Assuming your car is left hand drive, they are approximately above your clutch pedal. The lower dash cover panel has to be removed to see them.

This guide has some nice instructions for removing that trim panel, and the very last photo shows a couple of the connectors hanging down from the onboard supply control unit on the extreme right of the shot.  Your car should be a mirror image of most of this stuff.

The fan control module houses the only relays relevant to the radiator fans though, and that is located in the engine bay.

MK1 Fabia should be using K line for diagnostic communication rather than the CAN lines.

 

 

3 minutes ago, Tech1e said:

MK1 Fabia should be using K line for diagnostic communication rather than the CAN lines.

 

 

Hi Techie, thanks for your input. So what pins should I be looking for and what connections or this does not depend on the communication protocol?

Grey/white wire from Diagnostic connector pin 7 to engine ECU pin 43.

K line can have issues if an aftermarket headunit is fitted and the K line isnt removed from the ISO plug.

25 minutes ago, FemiE said:

Hi Techie, thanks for your input. So what pins should I be looking for and what connections or this does not depend on the communication protocol?

 

Fabia 1 is pre CAN for diagnostics. The CAN network is fairly basic and used mainly for comminucation between control units and gateway.

 

Just unplug the stereo (if aftermarket) and see if it comes back up.

24 minutes ago, Wino said:

Grey/white wire from Diagnostic connector pin 7 to engine ECU pin 43.

I will check this too in 1-2 hours. Thanks.

4 minutes ago, FemiE said:

I will check this too in 1-2 hours. Thanks.

First follow Tech1e's suggestion about unplugging the stereo, if it isn't the original unit fitted to the car.