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ECU replacement

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After some advice, probably from our resident techies.

Our 2.0tdi has been back and forth to the dealer a few times (well 6 actually) over the last month. Trying to cure the engine warning light. Originally diagnosed as a "flap in the intake". Ordered a replacement, wrong one arrived. Booked in again, part didn't arrive. Part fitted last week but light back on within 10 miles. Dealer now reckons it's "the computer" the needs replacing as it's logged all sorts of faults, lots of which are seemingly unrelated (although i suspect they're to do with the vast array of niggles i've learnt to live with).

So 2 questions here:

1: Is this going to cure it, or is there something else you'd try (have you had a similar problem?) I'm right royally narked off with all this as it wastes a good hour every day i take it in and i have to fork out to fill up a bone dry tank on the courtesy car each time too.

2: Would contacting Skoda UK have any benefit. This is the second dealer i've been to, and whilst their attitude is no where near as bad as the last, they still don't seem to know what they're on about. For instance i told them that the cooling fans weren't coming on, and hence the air con wasn't working in traffic. Oh no sir, it just needs regassing they say. So i then spend the day after they've "fixed" my car driving round london with the heater on full blast to stop it overheating as the fans still aren't working. Are there workshop facilities at head office that it could go to? Does it being a fleet lease car make any odds as to the service available from skoda?

The flap fault is a common one at the moment. Not just on Skoda but also VW.

The throttle flap that sits under the front of the engine just below the EGR unit gets stuck and cant move. As the motor inside the unit tries to move the flap and cant fuse number 8 (iirc) blows in the ebox under the bonnet. This also logs faults with the cooling fans and a few other systems iirc. A few people change the flap but miss the blown fuse.

Im sure the replacement flaps are modified now and latter crs dont seem to suffer.

I hope this is helpfull in someway.

Do you reckon fuse number 8 should be checked before anything else? if it's that, it'll be a damn simple fix no?

IMO fleet cars get the rough end of the stick from dealers as well but that's a thread for another day.

  • Author

Cheers for that. So blowing the fuse will take out the cooling fans too, or just make the ecu think that they've bust?

I'm jusrt being logical, Lummox said a popped fuse might have been overlooked, it's worth checking them to make sure that isn't the cause of your troubles. If it is it'll save you the hassle of returning to the dealers. It's a long shot but what have you got to lose?

Check your manual from page 288 onwards, engine compartment Fuse 38 appears to be for the radiator fan and "valves", I would check that one for a start.

The fuse will also knock out the fans.

Ive known people to change the fuse only for it to blow a little while later because of the seized flap. Took me a while to figure that one out.

Right here is the CFD for the engine in question.

Highlighted in red is the current track and the flap unit itself, this goes to fuse 8 in the Ebox under the bonnet. If this fuse blows it also knocks out the current supply to the blue line which goes to the fan control unit.

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