Good evening and a Happy New Year,

 

I had a problem with my  fabia 1.2 AZQ:

I drove about 150 km and while driving the oil lamp started flashing at the same time with an audible warning.

Then the battery indicator light came on and the engine stopped.

There is also an intense burning smell but I did not see smoke.

I found the fuse from position 9 burned (blue 15) and position 54 burned (blue 15).

After replacing the fuses, it still doesn't work.

I found the fuse from position 9 burned (blue 15) and position 54 burned (blue 15).

After I replaced the fuses, it still doesn't work. It smelled again and burned next to the battery and burned again fuse 54.

The ECU is burned and the model is 03E 906 033 A Benzin Simos 4672 Siemens 5WP40120 07

EF SJ8 326219 F025 2651.

I found an identical one as 03E 906 033 A Benzin Simos 4672 Siemens 5WP40120 07 (but only up to this code EF SJ8 326219 F025 2651).

I can replace it with an identical one without the new key, immo and without without moving the information, related to the immo part, from eeprom?

I understand that they must be removed from the donor board and the operation is performed with the help of a programmer.

Is it possible that the wiring is also burned or only the ECU is burned?

Anyway, what's the reason for burning the ECU?

Thanks!

Sounds like you have a serious short circuit somewhere and you need to find it before you start replacing burnt out parts.

So it is very likely to be a problem with cables/wires?

 

12 minutes ago, crior said:

So it is very likely to be a problem with cables/wires?

 

 

Yes of course, disconnect the battery and call an auto electrician before you set fire to the car.

Update:

After another check I found ignition coil burned.

So the short circuit was founded. 

Hopefully the ECU is not dead.

01314 error end 01598 error was detected. 

 

Fuse 9 powers the heaters in the two oxygen sensors, which will be grounded by the ECU.

Fuse 52 (not 54 that's left dipped beam headlamp) is the ignition coils' 12V supply, and also a switched 12V feed to the engine ECU.

 

Is any of the wiring to the ignition coils visibly burnt? 

 

 

16 minutes ago, Wino said:

Is any of the wiring to the ignition coils visibly burnt? 

 

 

Yes!

Photo?

Sounds like you may need to replace the engine loom. 😢

26 minutes ago, Wino said:

Is any of the wiring to the ignition coils visibly burnt? 

 

 

Yes!

Are we talking about these?

 

 

And is there a chance that the ECU will be OK?

Edited 3 January, 20224 yr by crior

The ECU may well have survived, yes.  

What might have happened is the melting of wires to do with the shorted ignition coil may have damaged the bit of loom that carries the power to the oxygen sensors too, if they are bundled together at some point.

Is that a photo of a secondhand loom off ebay or similar?

Where are you based?

 

 

It will almost certainly have survived, I had to completely rewire an almost new Galaxy where the loom had gone up because of a coil wire chafing, ignition circuit is not fused, overcurrent stuck the ignition switch contacts together so circuit could not be isolated, as the loom melted it shorted other high current wires running the length of the loom and the whole lot went up taking the dashboard and trim with it.

 

The ECU looked like it had been deep fat fried then finished in a bonfire, there was just a fused mangle of wires cut off with tin snips and a melted blob for the connector, but on close inspection the inner male part of the connector on the ECU looked intact, I had to cut through all the fused plastic and jack the connector apart.

 

I broke the seal on the ECU and looked inside, the inner casing looked like it had been heat treated with a welding torch showing all the shades of blue through to yellow, yet when the new loom was installed the vehicle started and ran absolutely fine, nobody could believe it but I had nothing to lose by trying.

 

Exchange reconditioned ECU's and sending the away for testing is a big scam and always a last roll of the dice to bring in even more money for a mechanic who cannot diagnose a fault and has played parts bingo with the customers money.

 

Back in the early days there were some with known faults like Montegos that had a manifold pressure sensor inside the ECU that became blocked with carbon, but even they were a scam, reconditioning consisted of a quick blow through with carb cleaner, since then ECU's have been indestructible and the very few genuine failures lost amongst all the claimed failures.