Technical coding new keys

[jonny cinq]

Hi
Does anybody know how you code a new set of keys after changing the ecu and code box
(both are new and never been used).
I have both the red key and 2 new blue keys but am unable to get it to recognise any key ,the engine starts but the key code light stays on.

 

[fingers99]

You've not got a lot to worry about.

Could be a minor fault in the transponder circuit (loose connection). Or try re-setting the ecu: disconnect the negative terminal for a couple of minutes.

 

[T14086]

did you fit ecu & code box at same time?

 

[jonny cinq]

yes ,both were unused and so was the lock set. I was told it was red key first, let the light go out, and then repeat with the blue keys ,then close with the red .Is this correct?

 

[ycming]

this a sporting cinq or 899 cinq ??

ming

 

[jonny cinq]

899 soleil on a "p" plate

 

[reddy4bed]

I think you have an ecu which suits a car with no immobiliser. consequently the the ecu is not asking the immo to do a key check, thus leaving the code light on.

 

[ycming]

Hmm you just get a uncoded ECU, then the problem solve ??? Any 899 cinq before 1995 have uncoded ECu.

Ming

 

[jonny cinq]

The code box and ecu are direct replacements (ie same part numbers) for the old one,the car starts and runs but will not let me code the new keys and lock set.

 

[ycming]

If your car starts and drive without the key being coded, then you have a uncoded ECU.

Just ignore it.

 

[jonny cinq]

I know what your saying ming but I took a coded ecu off and replaced it with a brand new ecu with the same part number, so must be coded, just carnt get the keys to code.

 

[ycming]

right right, but does your car drives normally as it should??

Ming

 

[jonny cinq]

Yes everything is normal apart from the keys ar'nt coded, and the code light flashes. I know its nothing to worry about but I just want to get it all back as it should be.

 

[fingers99]

If you've still got the old red key, try hanging it from the transponder wire. Not sure what this will tell us, but it might move the diagnosis on.

 

[jonny cinq]

No can do Fingers its a "virgin" ecu, ie never been used, so even if I had the old red key it wont work .
I have a new red key and 2 blue keys but car'nt get it to code any of the keys .Its not really a big problem having the light flashing but its frustrating knowing that it should go out.

 

[reddy4bed]

Have a look in the red key, does it have a transponder in it?. If not take one from one of your old keys and put in it. That then will be the master.

 

[jonny cinq]

The new red key already has a transponder in side it .It just wont let me code any keys.