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Old 10-01-2020   #16
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Re: Immobiliser problem

Fuseman hi, have you got a result with your fault yet?

Thanks Brian
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Old 10-01-2020   #17
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Re: Immobiliser problem

Quote Originally Posted by Communicator View Post
I assume that the 7,5A fuse that you are removing and replacing is F18, which normally provides a permanent (24/7) supply to the Code Control Unit.


Unfortunately there are no relays that could latch closed, so the most likely causes of failure are thermal with a micro crack in one of the components, or a firmware problem causing a lockup in the software.

I am sure that any simpler explanation would be most welcome.

The external wiring of the CCU, is relatively simple. It consists of a dedicated positive supply from fuse F18, with an earth connection at or close to the ECU. There is a short 2 core screened cable to the aerial on the ignition switch. Outputs are to the code lamp, and to the ECU. Finally there is a connection to the diagnostic socket.

The output or communication to the ECU is routed via connector D004 pin C19, and the earth connection is via D004 pin A2.


I believe that connector D004 is the multiway connector, under the engine bay fuseboard. I have read of corrosion occuring in this area, and the possibility could be worth eliminating.

To access D004, first disconnect the battery negative post. The fuseboard can then be unlatched, and carefully moved aside.

Fuseman & Brian,

I have been browsing and thinking. May I suggest that it could be of interest to browse the following thread. The thread title mentions x250 engine earthing straps, and ours are x244, so the earthing strap part does not apply. I suggest that you start reading from the posts dated 2 December 2013, towards the end of the first page, paying particular attention to the second page.

https://forums.outandaboutlive.co.uk...-again-/33081/

If I have understood correctly, the Code Receiver is failing to recognise your keys. It is worth noting that the code warning light is not powered by the same fuse as the code receiver, which only removes the negative from the warning light when the key is recognised. Could it be the case that the code receiver is loosing its positive supply due to a faulty wire or connection, as described in the linked thread?


One possible course of action would be to install an LED indicator to semi-permanently monitor the presence of 12V +ve at the code receiver, connector A pin 3. I have two colour codes for this wire, grey/blue, and red/yellow. I suspect that the latter code is correct, as the former colours are also shown for pin 2, the warning light connection.

Perhaps a miniature switch could be included in the circuit, so that the LED could be turned off, if it became a nuisance. I am thinking of something quite Heath Robinson, perhaps secured to the steering column with cable ties.
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Old 10-01-2020   #18
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Re: Immobiliser problem

Thanks Communicator for your help with this info, I am on that forum and Euroserve has always been helpful, he used to run a fleet of white vans, now retired, doesn't post much now?

Is it the same fuse box on the x250 just in a different place?

I did look at the multi plug in the bottom of the fuse box it was clean and dry used contact cleaner on it anyway, could still be broken wire though?

Is the light on the dash is powered from the fuse box or the immobiliser control box? With the immolbiliser control box unplugged the dash light DOSENT come on when ignition on, obviously it won't start

Is there a relay in there that powers up the Ecu?
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Old 10-01-2020   #19
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Re: Immobiliser problem

No I think your key ecu shot . Normally we change key ecu and engine ecu now if some cowboy or hackers been on your chassis number and changed it with a clone your screwed

New engine and key ecu prove me wrong
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Old 11-01-2020   #20
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Re: Immobiliser problem

I think that the engine bay fuseboxes on the x244 and x250 are similar.

The key code light on the dash is supplied with a positive via the ignition switch and F37 in the LHS cab fuse box. The negative (earth) to the LED is controlled by the code receiver, so the LED will not illuminate if the code receiver is unplugged. However I am wondering what happens if fuse F18 in the engine bay (code receiver supply) is removed, and then the ignition is switched on. If the LED does illuminate under these conditions, it is indicating a loss of supply to the code receiver which will obviously be unable to recognise the key. The loss of supply could be due to a wiring fault - broken wire, bad connection, or even a faulty fuse.


As I have stated previously, there is no relay to activate the ECU. The code receiver sends a key recognised signal to the ECU, which then operates the main injection relay, T09.
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Old 11-01-2020   #21
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Re: Immobiliser problem

Thanks again loads of help with bits of knowledge gradually putting a picture together

NEED some dry weather now to get out under the bonnet
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Old 14-01-2020   #22
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Re: Immobiliser problem

I have a x244 2006.

I only read about the immobilzer.
Can be a problem if the battery goes flat.

Then there is an emergency restart feature ?
The key is paired to the immobilizer. Needs to be programmed at a dealer.

Your battery in your key isn't flat?
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Old 14-01-2020   #23
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Re: Immobiliser problem

Key can go out of sync with code unit. If your code unit is OK several places can read it and code new transponders to start it. https://www.autotronics.co.uk/produc...ar-key-service
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Old 18-01-2020   #24
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Re: Immobiliser problem

Hi guys thanks for your on going support,

Communicator, lh or rh cab fuse box does not have a f37, there is f36 which is fine?

My dash led padlock symbol does stay on with ign on and f18 pulled, which confuses me as you say this indicates a loss of supply to CCU? F18 is the supply red and yellow

Read the thread you suggested and given the harness a good tug about and haven't been able to make it fail today!! Switched ign on and off twenty times! Bloody irritating thing!

Cheers Brian
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Old 18-01-2020   #25
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Re: Immobiliser problem

Corcai, ive sent email to place you suggested tried to explain situation?

Don't know if they do a drive in service?

Thanks for your help
Brian
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Old 18-01-2020   #26
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Re: Immobiliser problem

Brian,

Sorry that you are still frustrated.

I confirm that eLearn diagram E7010 for the key code system, shows the LED in the instrument panel as being supplied via fuse F37, which is sixth from LHS on the bottom row of the LH cab fusebox. I also have my own home brewed computer diagram, which shows F37 as a red 10A fuse in that location and that it supplies the instrument panel LEDs.

My thinkng was that if the code receiver (not theECU) was losing supply due to a wiring fault between it and F18, the LED would illuminate, which it should as the code receiver would not be working. You seem to have confirmed this.


When the problem occurs, do we know whether this is because there is no supply to the code receiver due to a wiring fault, or because the code receiver is not recognising the key? My suggestion of a temporary LED indicator to monitor the code receiver supply at the code receiver, was a possible way to resolve this. I fully appreciate that making the necessary connection close to the code receiver, is not the simplest of tasks. To elaborare, if the suggested LED is connected, and it remains illuminated when the fault occurs, then a supply failure to the code receiver from F18 is eliminated. That leaves a wiring problem to the ECU from the code receiver output, and a faulty code receiver as possible causes.
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Old 18-01-2020   #27
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Re: Immobiliser problem

Hi, frustration for over 12 months now! With your help I am the closest I've ever been to understanding how the system works, but I'm not an electrician!

Basically you are saying to put a visual guide in to monitor the 12 volt supply? This would be the red and yellow cable in the multi plug at the CCU. Is this correct so far?

One other thing I don't understand is when the fault occurs, why does disconnection and reconnection of the multi plug at the CCU fix it? Effectively just cycling the power
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Old 18-01-2020   #28
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Re: Immobiliser problem

Your chasing rainbows your code 2 box needs replacing if your fiat dealer canít do it find some specialist that can program new code 2 box onto your chassis and ecu , I donít always talk crap!
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Old 21-01-2020   #29
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Re: Immobiliser problem

Hi Com, yes you are correct about fuse 37, I had no way of telling which one no markings on my fuse box lid just symbols, it is good and does stop the dash leds except the water in diesel one?

Now got a simple meter for checking 12 volt and continuity, so supply red and yellow to CCU IS live all the time with ignition off, assume this is correct?

Still waiting for a response from the autotronics place I messaged them direct from their website 4 days ago, so if they can't be bothered to even reply I'm not confident to use them shouldn't have to chase people
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Old 29-01-2020   #30
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Re: Immobiliser problem

Communicator and Corcai, sorrow no contact for awhile, I go out to it most days and not had the bl.......y fault come up for couple of weeks! So not been able to check supply at pin 3, although this is live even with ignition off
Can you explain why when fault comes up simply disconnecting the multi plug at the CCU and putting it back fixes it?
Tried 3 key coding people now no one interested because it's so random?

Thanks Brian
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