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Old 26-02-2019   #16
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Re: Key wonít turn in its slot

Would just like to add some info/caution about key programming with MES.

For many years MES did not support key programming because if anything did went wrong (user error, hardware error, unreliable bluetooth etc) then the target vehicle could be left immobilised with all keys deleted. MES developer did not want to be held responsible etc.

After numerous requests for the key programming function this was eventually introduced "BUT AT THE MES USERS RISK".

My suggestion is that if anyone wants to use MES to program keys or any other security type functions then I suggest you drive to your local Fiat dealer/workshop equipped with Fiat's own kit and the do the programming with MES in their car park. If you hit problems and your vehicle is immobilised then you won't have to worry about recovery costs as your vehicle is already where it needs to be.

Of course if you have your own car trailer/flat bed then the time and easy of working from home to resolve problems is a bonus.

BUT NOTE! Towing is NOT an option. You will need a trailer/flat bed as the vehicles steering lock will be engaged if programming fails.
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Old 04-03-2019   #17
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Re: Key wonít turn in its slot

Quote Originally Posted by uksdsgl View Post
Thanks very much for your advice, ignition switch document, link and kind offer of assistance.
<SNIP>

Iím trying to source a new Ignition Switch (TEG reader).

Part numbers are 735398770, 735431280.
Hi,
I saw your ad for a TEG. You could ask these people,
www.ebay.co.uk/usr/jcracknellcarsales

also on the web
https://www.jccars.co.uk/
if they can clone a TEG reder for you. They told me they could clone a Croma Body Computer so may be able to help. You would have to send them your TEG and a working used one to clone to it. Easier than changing everything.


Robert G8RPI.
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Old 12-03-2019   #18
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Re: Key wonít turn in its slot

The refusal of the keyfob (TEG) to turn 1st time started in December. 3 months later, the keyfob continues to turn to start the Croma on inserting it for the 2nd or 3rd time.

Thanks portland_bill, the ePER doc reassured me that I probably have time to try and solve the problem - if the problem worsens and I canít turn the keyfob to start the car, despite repeatedly inserting the keyfob into its slot, then the keyfob could be released to turn by inserting the mechanical emergency key into its slot and pushing it right in.

Thanks Robert G8RPI, I phoned them Ė but they said they canít help with this problem.

I cannot source a used Ignition Switch (TEG reader) and I cannot find anyone to repair / clone the Ignition Switch.

Iím hoping the problem will be solved by my mechanic or a dealer replacing the Ignition Switch with a new one.

Is the Croma 194 Ignition Switch unique?
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Old 12-03-2019   #19
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Re: Key wonít turn in its slot

Quote Originally Posted by uksdsgl View Post
The refusal of the keyfob (TEG) to turn 1st time started in December. 3 months later, the keyfob continues to turn to start the Croma on inserting it for the 2nd or 3rd time.

Thanks portland_bill, the ePER doc reassured me that I probably have time to try and solve the problem - if the problem worsens and I canít turn the keyfob to start the car, despite repeatedly inserting the keyfob into its slot, then the keyfob could be released to turn by inserting the mechanical emergency key into its slot and pushing it right in.

Thanks Robert G8RPI, I phoned them Ė but they said they canít help with this problem.

I cannot source a used Ignition Switch (TEG reader) and I cannot find anyone to repair / clone the Ignition Switch.

Iím hoping the problem will be solved by my mechanic or a dealer replacing the Ignition Switch with a new one.

Is the Croma 194 Ignition Switch unique?
Yes it is unique to your car as well as the Croma. You would have to buy a new TEG through a Fiat Dealer and it will be coded to your car at the factory. The dealer will then also have to program your keys to it.

Worth getting fixed quote from a dealer first.
I would be happy to look at your TEG, change the capacitor and check the microswitches. The problem is I can't do this instantly, I have not looked at a TEG before so cannot pre-order parts. I would have to dissasemble your unit, identify the component values and order replacement(s) wait for them to arrive, install them and send the unit back to you. Obviously you can't use the car while I'm doing this. I cannot fully check the repair as your TEG will not work in my car, but I can test the components (including the capacitor(s) at low temperature) and basic power supplies etc. I'd only charge the cost of part and the return postage.
I am a professional electronics engineer and while I currently work in an office (aerospace design) I have decades of experience repairing electronics and have a professionally equiped workshop at home. Please PM me if you want to discuss this further.


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Old 01-05-2019   #20
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Re: Key wonít turn in its slot

I sourced a replacement Ignition Switch (TEG reader) online from Spain. The supplier confirmed by email the Ignition Switch was new (old stock), so I bought it.

My mechanic:
ē Got the Fiat Codes for my car from a Fiat dealer
ē Swapped the original Ignition Switch with the replacement Ignition Switch provided
ē Tried to code the replacement Ignition Switch to my car - but this failed because the replacement Ignition Switch was found to be already coded (i.e. The TEG reader was not ďvirginĒ) and hence it would not take my carís code
ē Swapped back the replacement Ignition Switch with the original Ignition Switch

So, although the Ignition Switch was sold to me as new, it has been coded to another car and then either used in a car or just returned to its box.

And because we cannot find anyone to virginise a Croma TEG reader, this replacement Ignition Switch is useless.

The keyfob continues to turn to start the Croma on inserting it the second time (or rarely the third or first time).

I think Iíll continue to live with the problem, hoping the Ignition Switch doesnít completely fail, before trading the Croma in for a newer car at a dealer, unless I can source a virgin replacement Ignition Switch.
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Old 02-05-2019   #21
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Re: Key wonít turn in its slot

Quote Originally Posted by uksdsgl View Post
I sourced a replacement Ignition Switch (TEG reader) online from Spain. The supplier confirmed by email the Ignition Switch was new (old stock), so I bought it.
<SNIP>

I think Iíll continue to live with the problem, hoping the Ignition Switch doesnít completely fail, before trading the Croma in for a newer car at a dealer, unless I can source a virgin replacement Ignition Switch.
Hi,
I'm sorry to hear this. Unfortunatly there is no such thing as "virgin" Croma security coded ECU. As I said in my last post the replacement ECU has to be programmed to your car at the factory. I don't think that the factory can re-programme them. The most anyone can do is to copy the data (or transfer the whole chip) from the old unit into a replacement one but the ability to do this depends on the exact chip used in the unit.

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