Fiat Coupe Forum
- Founded by Kayjey & James Northam
- Funded by the Club for the benefit of all owners
Fiat Coupe Club UK
join the club
Fiat Coupe Forum
 
» Announced
    Posting images


» Related sites
    Main club site
    fiatcoupe.net


» External data
    owners listed
 
Who's Online Now
0 registered members (), 83 guests, and 2 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics113,486
Posts1,339,858
Members1,764
Most Online731
Jan 14th, 2020
Top Posters(All Time)
barnacle 33,502
stan 32,122
Theresa 23,283
PeteP 21,431
bockers 21,070
JimO 17,917
Nigel 17,363
Jim_Clennell 16,603
RSS Feeds
Club Events
Club Information
Track Events
Rolling Road/RWYB
Social Events
Non-UK Events
Coupé Related Chat
Coupé Spotting
Coupé News/Press
Buying/Selling Advice
Insuring a Coupé
Basic FAQ's
How to Guides
Forum Issues
Technical Problems
General Maintenance
Styling
Tuning
Handling
ICE and Alarm
Coupés for Sale
Coupés Wanted
Parts for Sale
Parts Wanted
Group Buys
Business Forum
Other Vehicles for Sale/Wanted
Other Items for Sale/Wanted
Haggling/Offers
Ebay links
Other Cars
Other Websites
General Chat
Previous Thread
Next Thread
Print Thread
Broken Immobiliser? #1663297
01/02/2023 01:55
01/02/2023 01:55
Joined: Jan 2023
Posts: 3
Surrey
JPS Offline OP
Newbie
JPS  Offline OP
Newbie

Joined: Jan 2023
Posts: 3
Surrey
Hi I've recently acquired a 1995 16v non turbo and it wont start with any of the 3 keys I have but (does crank over),
I tried the battery fix but I believe the immobiliser is completely screwed.
In the owners handbook it says to start the emergency start procedure wait for injector light to come on and pretty much it doesn't come on at all, did have a look to see if it was the bulb but no it was fine
I've scrolled though the forum to see if i could find the answer but came up short.

I would greatly appreciate if someone help/point me in the right direction as id like to remove the immobiliser permanently

Last edited by JPS; 01/02/2023 01:56.

Owner of the only White FCC hat an 1 owner full history Broom Yellow 16v
Re: Broken Immobiliser? [Re: JPS] #1663307
01/02/2023 08:34
01/02/2023 08:34
Joined: Mar 2007
Posts: 16,543
Auld Reekie
Edinburgh Online content
Club President, member225
Edinburgh  Online Content
Club President, member225
Forum veteran

Joined: Mar 2007
Posts: 16,543
Auld Reekie
Welcome to the forum JPS, I'm sure there will be a few rare 16v owners on here who will be glad to see you.

Not forgetting a certain broomy 16vt owner nearby of course.. wink


BumbleBee carer smile
Re: Broken Immobiliser? [Re: JPS] #1663309
01/02/2023 10:18
01/02/2023 10:18
Joined: Mar 2019
Posts: 249
North Macedonia
386ka Offline
Club member 1814
386ka  Offline
Club member 1814
Making a profit

Joined: Mar 2019
Posts: 249
North Macedonia
Hey JPS, nice to see another 16v around. Do you see the yellow CODE light come up? Does it go off?

If the injector light does not come on, I think you might be having issue with the power to the ECU. As far as I remember, if you have issues with the immobilizer, both the CODE light and injector light stay on.

Re: Broken Immobiliser? [Re: 386ka] #1663315
01/02/2023 13:20
01/02/2023 13:20
Joined: Jan 2023
Posts: 3
Surrey
JPS Offline OP
Newbie
JPS  Offline OP
Newbie

Joined: Jan 2023
Posts: 3
Surrey
Hey 386ka I haven't seen another 16v driving about in quite some time their quite rare these days
Well the CODE light stays on and the injector light doesn't come on at all, I was told by the pervious owner that it was parked up for 6 months and she went to start it and nothing would happen and it sat there for the next 5 years,
so it could also be an ECU issue


Owner of the only White FCC hat an 1 owner full history Broom Yellow 16v
Re: Broken Immobiliser? [Re: JPS] #1663316
01/02/2023 14:00
01/02/2023 14:00
Joined: Mar 2019
Posts: 249
North Macedonia
386ka Offline
Club member 1814
386ka  Offline
Club member 1814
Making a profit

Joined: Mar 2019
Posts: 249
North Macedonia
Okay - maybe check if the ECU diagnostics plug is connected. If it is open, then you won't see the injector light on ignition.

It is a 3 pin plug, located on the driver side suspension turret or washer bottle. You need to have it connected in order for the light to work. It would not make any difference relating the no-start issue if it is connected - but at least it will give the indication that the ECU is powered, and then we can look at the CODE light.

The thing is that these models AFAIK suffer from being left with low battery voltage, which will affect the immobilizer box and it would need to be reprogrammed.

Re: Broken Immobiliser? [Re: JPS] #1663394
05/02/2023 23:11
05/02/2023 23:11
Joined: Jan 2023
Posts: 3
Surrey
JPS Offline OP
Newbie
JPS  Offline OP
Newbie

Joined: Jan 2023
Posts: 3
Surrey
Well after seeing if it was just a plug not done up correctly I came up short, I went over the whole engine bay checking if all the connectors where done up/connected and still no fire only spin
So I think its time to get the ecu immobiliser and key reprogramed But I don't know who to go to for this


Owner of the only White FCC hat an 1 owner full history Broom Yellow 16v
Re: Broken Immobiliser? [Re: JPS] #1663395
05/02/2023 23:29
05/02/2023 23:29
Joined: Dec 2005
Posts: 8,366
Lightwater, Surrey
DaveG Offline
Club Treasurer Member 311
DaveG  Offline
Club Treasurer Member 311
Je suis un Coupé

Joined: Dec 2005
Posts: 8,366
Lightwater, Surrey
You might want to try GrahamL on the Forum, he has fixed my corrupted CODE box (20vt) and it might be similar for 16v


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: Broken Immobiliser? [Re: JPS] #1663399
06/02/2023 01:25
06/02/2023 01:25

G
GrahamL
Unregistered
GrahamL
Unregistered
G



The 16v ECU stores the immobiliser codes differently so not sure I can do anything with it. I had a 16vt firmware image with the immobiliser disabled but unfortunately I never saw a 16v na equivalent. Don't think I ever even saw a dump of the 16v na firmware at all.

However, it sounds more like an ECU problem than an immobiliser problem.

At ignition on the ECU and immobiliser should power up and switch on their respective dash lights. Then they attempt to communicate with each other and confirm that they are connected to the correct partner unit and if so will then switch off their own dash light.

So the fact you have no ECU light but have the code light strongly suggests a problem with the ECU not powering up along with the immobiliser switching on its light as expected but not switching it off as it can't talk to the ECU, again suggesting an ECU rather than immobiliser issue.

I don't know the 16v fuses but on the 20v there's en EFI maxi fuse for the ECU so check for something similar, or possibly broken wiring or bad connection on main ECU plug.

Re: Broken Immobiliser? [Re: JPS] #1665665
07/06/2023 12:34
07/06/2023 12:34
Joined: Dec 2005
Posts: 33,502
Berlin
barnacle Offline
Club Member 18 - ex-Minister without Portfolio
barnacle  Offline
Club Member 18 - ex-Minister without Portfolio
Forum Demigod

Joined: Dec 2005
Posts: 33,502
Berlin
It's been a long time since I've looked at this, but I have a vague memory that on the 16 - differently from the 20 - the key talks to the immobiliser which authorises it, and then tells the ECU that it's ok to work. So it needs only the key and the immobiliser box to match. But as I said, it's been a long time... one place to look is perhaps the coil around the ignition key barrel and its wiring; check that its close to a short circuit (just a few ohms) from the plug end. If that goes open circuit, I think that throws an immobiliser error - and it certainly can't read the chip in the key.

I too have seen both immobiliser and non-immobiliser versions of the 16VT ecu, but not the 16NA. I have seen a 16NA code dump but I believe at the time I concluded that it was broken; I'll probably be pulling a dump from my 16NA once it's in my hands again (I have concerns about the longevity of the PROM/EPROM/EEPROM in there... we're already over twice the expected lifetime for an EPROM).

Neil


[Linked Image]
Don't get no respect! Coupe Fiat 1994-2000 - an owner's guide <-- clicky!
Re: Broken Immobiliser? [Re: JPS] #1666179
05/07/2023 13:53
05/07/2023 13:53
Joined: Dec 2005
Posts: 21,431
Aldershot
PeteP Offline
Hon Club Member 005, Membership Secretary
PeteP  Offline
Hon Club Member 005, Membership Secretary
Forum Fossil

Joined: Dec 2005
Posts: 21,431
Aldershot
Neil, it was actually a dead 15?amp fuse but I forget where James said it was. Near the battery I think, anyway so no power going to the immobiliser.


16VT and X1/9 1500

We must all do our part for the planet.
I unplugged a row of electric cars that nobody was using.

Powered by UBB.threads™ PHP Forum Software 7.7.1
(Release build 20190129)
PHP: 7.3.33 Page Time: 0.014s Queries: 14 (0.006s) Memory: 0.7875 MB (Peak: 0.8877 MB) Data Comp: Off Server Time: 2024-03-01 14:45:37 UTC