For those who are interseted in the wiring of this ECU here's the layout as I understand it. There's also some useful information to re-write the eeprom to disable the immobiliser.

Tony.

But:

1. I am 99.99% sure that pin 26 of the ECU is not (or rather, can technically be but should not be) connected to anything.

2. I do not see the AC things on this diagram, do I?

woj said:

But:

1. I am 99.99% sure that pin 26 of the ECU is not (or rather, can technically be but should not be) connected to anything.

2. I do not see the AC things on this diagram, do I?

Click to expand...

1) Good to know you are paying attention out there , I've altered the attachement.
2) There is no washers / lights / or many other things - its really to be used for wiring the ECU or decoding it.

Tony.

Yes, but AC relay and button are ECU controlled

Ok just altered the diagram for you Woj.

So just to clarify IF you have A/C there is a couple of extra wires connected at pins 8 & 24

Thats the best I can do, looking forward to seeing a diagram from you next time!!

Tony.

what tool do i need to buy to read the ecu... ive seen the kwp2000 plus but that seems a little to cheap to be true??

cheers
lee

If you want to read thro the diagnostics then there are a few programs around which plug into the 3 pin diag socket. KWP2000 would be no good for this old ECU. There is a guy on here who writes the programme etc.

My interest is
1/ Virginising so that an ECU from a scrapyard will run in another car.
2/ Immobiliser disabling so that an ECU will operate in any car, (sometimes called "decoding").

For this I use 4 connections directly to the processor, UPA3 software with a motorola adapter, and 2 power connections to the ECU. Also a new code to put directly into the eeprom.

Tony.

There is a quicker way to deal with immo entries in the EEPROM, but requires some knowledge. Namely, a short HC11 program on the eprom dice that writes the eeprom for you when you power up the ECU (can be done on the car). Then you put back the original ECU eprom in and you are done. Takes 2 minutes or so (plus opening of the ECU). I do have an HC11 program like this for all three IAW ECUs, 16F, 8/18F, and 18FD, contact me if you are interested in a deal

Also, I am not sure what you mean by decoding here? Virginised ECU is decoded and stays decoded until you connect an active immobiliser box to it. (Although I have seen one ECU that had a proper immo code in the eeprom, yet it was reporting a virgin state). You can also decode the ECU permanently by changing the ECU program on the EPROM such that it will ignore the coded status of the EEPROM and let you start the engine nevertheless. Again, I know how to do this for all three ECUs mentioned above, if interested contact me.

Dont think I would be interested in a "deal", I can happily write a program in firmware which will re-write the eeprom for no cost by using your method.

These units are getting very old-hat now and are not really worth me spending more time on them. Its just that a few people occasionally want ECU altered and I was trying to help those that are capable to do it themselves.

You can put a certain code in them which will make them ignore the key request, I think thats what you are refering to "(yet it was reporting a virgin state) I put a small code in this ECU which does that.

Tony.

reddy4bed said:

Dont think I would be interested in a "deal", I can happily write a program in firmware which will re-write the eeprom for no cost by using your method.

Click to expand...

Thought so, but it never hurts mentioning

These units are getting very old-hat now and are not really worth me spending more time on them. Its just that a few people occasionally want ECU altered and I was trying to help those that are capable to do it themselves.

Click to expand...

They are very durable too, so "normal" people seldom have the need to replace an ECU in their car. That's why I have decided not to ride the local scrappies and start collecting them for decoding and sale. Also scrappies ask quite a bit for them, 50 Euros last time I checked.

You can put a certain code in them which will make them ignore the key request, I think thats what you are refering to "(yet it was reporting a virgin state) I put a small code in this ECU which does that.

Click to expand...

I see, indeed the virgin flag is stored in the eeprom, I just was not (contiously) aware that you can make the ECU have this flag set in the eeprom and not clear it even if there is a valid code in there. In other words, I thought it is pointless to modify the flag in the eeprom, because the ECU would set/clear it anyhow. And it is useful to have this possibility indeed - in this scenario the ECU will not recode itself when (accidentaly) connected to an immo box. A fully virginised ECU will.

Just saying this for the ones that want to learn following your lead We learn something everyday

Here's the file I load for this ECU, I believe its ok for many Fiat MM ECU's.
Note the 00 00 at address 196h

Tony.

Yup, all I can say is Reddy has removed the immob off my Ecu and work perfectly.

It is handy for anyone that is wanting to do the 16v conversion!

Ming