Daewoo Nexia ECU

If the car has an immobiliser then the ECU will be locked to the appropriate key. If you can get the key from the other car you can remove the pickup coil from the ignition barrel on your car and tape the key from the new ECU to it and stick it up under the dash. Your normal key will then start the car, but you will not have an immobiliser.

JOhn

I've never seen a Daewoo key, but a neater solution might be to take the keys apart and swap over the transponder. It's normally in a black plastic package a bit smaller than a tic-tac.

Cheers,

Colin.

This very same problem was mentioned in car mechanics magazine a month or two ago, the new ECU needs to be programmed with the VIN number of the car it came from or something similar! And also into the Immobiliser and the two numbers have to match.

I think basically you need the chassis number of the car the ECU came from to do this properly.

Andy

My peugeot 806 has a very stupid system of a drop down keypad to enter a code to start the engine.This pad sits right beside your right knee and IF you forget to push it back up out of the way.....back to the main dealer for ANOTHER keypad flap assembly circa £35.Seeing this thread I wonder if it is poss to do away with the whole contraption somehow by locking the code on permanently. ??

On all Pugs with the keypad immobilizer its quite easy to set it permanantly to "valet mode" whereby you dont need to enter a code at all.

Not sure your insurance would liek it though.

Tim..

Thanks for the replies. I opened up the ecu to have a nosey inside and noticed a large chip contained in a blue plastic housing that allows you to pull the chip out of the main board. I'm not sure what info this chip contains or whether it's anything to do with the immobiliser?

That can be done with some keys alright, but just going from memory I think the transponder in the Daewoo is moulded into the key.

John

Tthis can only be done with a new ECU. Once the ECU is programmed to a particular key it is locked to that key. There may be exceptions but I havn't come across any yet.

John

That would be a bit of a bugger. I'd still be tempted to shave away at the key with a stanley knife though. The transponder package should be much harder plastic than the key handle.

Cheers,

Colin.

Unfortunately , I doubt if the key transponder chip swap will work. On most Daewoo systems , the Key is programmed to the immobiliser and the immobiliser is , in turn, programmed to the ECU. This means that swapping the key chip on it's own will not work. The alternative is to get your original ECU repaired which should then retain all your immobiliser functions. Regards mike-w

Try

The module inside the ECU is referred to as a 'MEMCAL' which contains the information which lets the ECU know what vesion of vehicle it is fitted to. For example an Automatic vehicle will have a different module to a manual and an air conditioned vehicle will have a different version again. This has nothing whatsoever to do with the immobiliser. Mike

Thanks for that. Does this MemCal chip hold the fuel / air calibration settings for that particular engine and would a chip from another similar car's ecu work in mine?

Yes the calibrations for all operational functions are included including air-fuel ignition timing idle control etc. You should be careful of swapping MEMCALS however as there are also several different ECU 'carcases' in which the MEMCALS are designed to operate - in particular , some use different ignition systems. Putting the wrong version of an unsuitable carcase could cause engine damage if chosen incorrectly. Regards

I've swapped the MemCal over and it seems to be running very well but I did notice at first that the revs were taking a long time to drop to normal when the car is first started - although I think that was the ecu going through its self-learning process as it's now back to normal and ticks over very stable even under full electrical load. The car was previously using more fuel than normal and struggled on MOT emissions so I will monitor if there's any difference in performance / MPG with the new MemCal.