I have a Skoda Fabia -00 and have a problem fuse 7 (Engine Electronics, power steering 5Amp),

burn almost every time the key is turned to first position (not start), then the power steering

does not work when I start the car and the PAS lamp glow.

If I temperarily put a stronger fuse and start the car and remove the fuse, I still got a

working PAS.

The fuse seem only be needed at startup?

I measure the amps over the fuse and it shows around 7Amp when the ignition is on position 1,

and when I startup about 10Amp. Why? how? and where does it come from, this strong power Amp?

On VAG refused sadly telling anything about it.

To try stop the stream of 7Amp I have loosened all the contacts on the power steering pump,

loosened all the fuses inside and out and the four relays biside/under the steering wheel

without success :(

Have Googled lots without success so am very grateful for tips and ideas!

Edited 23 April, 201412 yr by Froso

The first thing I would do is to disconnect the 4-pin connector at the PAS pump and see if the fuse still blows. Measure the current.

I assume this has a KOYO pump. If so, take a look at sound deadener around the pump. It can become soaked by salty water.

What engine does this car have?

(there is a three character engine code on the label under the boot carpet).

Thanks for your answer!

I have already tried to disconnect all three connectors on the pump and measured current. But unfortunately without results...

It is a KOYO pump. I have already removed the sorrunding material (it was soaked). I have also removed the protective cap under the pump. The electronics looked fine.

I have in my other post about the EGR valve problem, got hints that it may be involved in the fuse 7. Shall troubleshoot around this soon.

The engine code is AUB.

On this engine, the N18 EGR valve is the only other item on fuse 7. There is a 6-pin connector on the EGR. IIRC, the valve is between pins 1 and 5.

I know it’s a super old post but I was wondering if author managed to find the cause of the problem. I have the same issue and have searched endlessly to try and find the root of the issue but no luck.

On which car?

assuming its a fabia 1; 

recent PAS issues i had with my car included (after steering failed & warning lamp was on) that fuse 7 had blown--caused lack of comms with diagnostics ?

it was indeed my electric pump that had failed as control module is built in.

On 28/12/2020 at 17:04, Wino said:

On which car?

It’s mk1 Fabia, 1.4 1.6v automatic. Tried disconnecting everything that i think runs through fuse number 7 (3 connectors on the power steering pump and the EGR) but fuse still burns as the ignition is switched on. 

What year? I can check wiring diagrams for anything else. Think there may be a PCV valve heater.

@Denok; I can't help without this info.

Edited 10 January, 20215 yr by Wino

Well, hopefully you'll come back sometime to tell us, but for now, here's a photo of the PCV valve on the back of your engine.  On the side of it, at two o'clock in this view,, there's a two-way electrical connector which powers the heater I mentioned  Ignore the arrow, that was to show something else.  These have been known to fail short-circuit, so unplug that connector and try a new fuse.  You can probably reach it by reaching round the timing belt end of the engine.

 

If it's an early engine, it may not have such a connector, in which case it must be a wiring short to earth somewhere.

 

 

Edited 10 January, 20215 yr by Wino

38 minutes ago, Wino said:

What year? I can check wiring diagrams for anything else. Think there may be a PCV valve heater.

@Denok; I can't help without this info.

Thank you for coming back to me so quickly Wino! I appreciate it and please accept my apologies for not coming back to you as quick. Car is 2003. Thank you!

No worries, it'll have that heater then, and I bet that's the problem.

7 minutes ago, Wino said:

Well, hopefully you'll come back sometime to tell us, but for now, here's a photo of the PCV valve on the back of your engine.  On the side of it, at three -o'clock in this view, there's a two-way electrical connector which powers the heater I mentioned  Ignore the arrow, that was to show something else.  These have been known to fail short-circuit, so unplug that connector and try a new fuse.  You can probably reach it by reaching round the timing belt end of the engine.

 

If it's an early engine, it may not have such a connector, in which case it must be a wiring short to earth somewhere.

 

 

7 minutes ago, Wino said:

Well, hopefully you'll come back sometime to tell us, but for now, here's a photo of the PCV valve on the back of your engine.  On the side of it, at three -o'clock in this view, there's a two-way electrical connector which powers the heater I mentioned  Ignore the arrow, that was to show something else.  These have been known to fail short-circuit, so unplug that connector and try a new fuse.  You can probably reach it by reaching round the timing belt end of the engine.

 

If it's an early engine, it may not have such a connector, in which case it must be a wiring short to earth somewhere.

 

 

That’s very valuable info. I can confirm it does have a connector as I took that off recently to give it a clean. I will take that off tomorrow afternoon and post back how that goes.

 

5 minutes ago, Wino said:

No worries, it'll have that heater then, and I bet that's the problem.

I think you are right on the money there Wino, I will check tomorrow and let you know how it goes. 

3 hours ago, Denok said:

 

Wino, you Sir are an absolute Legend! I couldn’t wait to test it so go my torch and went out to have a look. Disconnected the connector for pcv valve heater and it stopped burning fuse. Going to take pcv off Tomorrow to get part number and replace. Thank you!

I had a feeling you might want to check soon, good work.

Should be first listing of item 19 here, I believe cylinder block with pistons; oil sump - Fabia(FAB) [EUROPA 2003 year] (7zap.com)

not my issue that was sorted out here, but just want to say nice one Wino !

6 hours ago, Daddyfixitsnew1 said:

not my issue that was sorted out here, but just want to say nice one Wino !

Second that, Wino! You may have saved this car to die another day. Not sure I had enough patience left to keep it on the road. Top man! 

Thank you both for your help! 

I have been looking for a solution for more than a year! Thank you so much! You sir made my day! At least now i know what the problem is!