Hi Guys

Over the past Year as I've been working though the Modifications to my 993TT I have picked up a few spare DME's to fit at a later date.

My trouble is that I cannot seem to get any of the spare DME's to fire my car except my original one.

The car has a factory immobilser fitted although I don't know what the atual type is. I use a key to get in and have a small 4Pinned plastic fob which inserts just above the main ignition key.

With my standard ECU (Admittidly modified by RS-Tunning Kit1 -450BHP) everything works fine. This was how I bought the car with K16's.

As I've got hooked on the go faster virus, I've added K24s and all the toys and I've aquired these 2 spare modified ECU's.

One is a 95 DME (2Chip) which is confirmed as modified by Mr Gunther of TTP fame. Good for 540BHP with K24's etc.

The other is a standard 97 DME (Single Chip) from a 430BHP TT.

My intention was to run the 95 Gunther DME until I got the car run in and happy and then take the car to a local Porsche specialist and have him modify the 97 DME specifically to my car.

However,

With either of these two DME's the car simply won't start. The Immobiliser Key beeps OK and everything appears good, the car turns over but simply wont fire up.

My question is (Yes I've finally got to it), do I need to have these DME's modified to run in my car?

Is that fact that the car turns over but won't fire, the immobliser function of the 'ECU' as the seperate immobiliser unit appears to be working fine?

Do I need to take the DME's to a Genuine Porsche Dealer to have them modified to my car and in doing so will this erase the programmes that are on them?

I have searched through the archives with some interesting results, and I'm really just looking for someone with a bit more knowledge than me to confirm this is so, (So I dont look a Prat to the local dealer when I ask them to do this! )

Is the equipment they use to do this refered to as 'the hammer' and is it just genuine Porsche dealers that have them or can I go to a local porsche specialist.?

Many Thanks in advance for any comments posted.

Thanks

Jim

 

mjims, I had the same problem a few months ago. To solve the problem you must need to send the ECU with a tuner to dissable the immobilizer. Are the ECU for an Euro specs car? I read at the forum that the Euro ECU won´t start US cars, but don´t know inverse. Check with tuners and they should solve the problem. The stock ECU can run with the k24, but the benefits are limited due to the program that is for k16 not for k24, but the car must start.

 

Thanks Corte Loco

Yes both ECU's are from the US.

Jim

 

Don't know about US but here in Europe (according to Porsche) you have to go to the shop and let them reprogram the ECU while it's in the car so it recognise the car. If you don't do this, the car won't start. Sounds logical to me since otherwise it would be easy for theifs to just carry an ECU with them if they want to steal a car with immobilizer.

/Erik

 

mjims
The immobilising set up which you have was what came as stock on UK cars. There was an upgrade to PA1000 available which did away with that PIA little key thingy and allowed the immobiliser to be deactivated by a plip (which also unlocks the doors) as far as the ECUs, my understanding is that they have to be matched to your car. I had one done by Gunther in '97 and I had to send the original box to Germany. For a definative answer, I would ask either Steve W who usually chimes in helpfully on here or Todd Knighton (www.protomotive.com) who is another ECU guru

 

Send it to Todd (Protomotive). He´s the man. He also carry the best price in the market and he really knows what to do. He´s preparing two ECU for me at this moment; one for a TTP kit and one for my 993 tt.

 

Thanks for all the info guys,

I can see the logical reasoning behind having to have a coded ECU so as to stop theives etc. this is surely a good thing for all porsches.

I took the car down to a local specialist this morning who plugged up his PST2 box into the ODBII connector and ran a diagnostic on both ECU's when connected into the car.

My ECU came up with no faults and runs the car just fine. (Even with the 5BarFPR and K24s - Smells a little rich mind!)

The one that wouldn't start the car came up with a DME fault code 39 Anti Drive off system activated.

I asked if there was any way that they could reset this and they said no.

I also spoke to a UK Based Mobile Porsche ECU Specialist recommended by my dealer (A chap called Wayne Schofield). He explained to me that once the Immobliser code is in the ECU it cannot be removed.

He also suggested that if I gave him both the ECU's (95' 2Chip) he could remove the chips and fit a carrier into each DME to swap the chips over, the principal being that the Immobliser function of my original ECU will remain but the MAP on the Gunter Chip should then work.

Does anyone know if this would work.

I'm a little worried about chopping up my working ECU if I'm going to have to send it back to germany to be reset. Or worse...kill it completely

Thanks

 

Contact Todd Knighton at Protomotive, he can dissable the immobilizer. On the 95 ECU you need to upgrade it to one chip and then it works on your car with no problem. Contact Todd and send him the ECU and save money ;.)

Good luck and let us know.

 

So are you saying that it's pointless trying to use the gunther 95'2Chip and start with the 97'Single chip?

Is it atually possible to convert a 2chip DME into a single chip? Looking at the rennlist archives this goes against most tuners discussions, stating that you need to replace the entire 2chip DME due to the chips being unavailable anymore, hense they cannot be 'newly' modified.

As the 95'2Chip is already programmed I was hoping to make use of this unit until I was ready to start 'fresh' with a 'taylored' MAP on the 97'Single Chip DME?