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Technical Ducato Immobiliser issue

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Technical Ducato Immobiliser issue

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wordingh

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Hi,

I have a 2013 Ducato Multijet 130 based motorhome which is stuck with the immobiliser light permanently on. The engine will turn over but obviously will not start.

I have checked fuses, battery and tried to start it with the spare key but no luck so far. I have then checked the two wires to the immobiliser aerial surrounding the ignition lock, but they seem to be connected ok.
I was planning on tracing continuity from the aerial to the body computer connector A, but I cannot see any sign of the white/brown and white/grey cables in the Blue Delphi connector block, not sure why !?

I am not sure if maybe the ECU and the keys have fallen out of sync with their codes, but I don't know if this is likely or not.

I would appreciate any advice on anything else I can check,

Br

Paul
 
We are currently facing similar problem, won’t start one day into holiday, had to be low loadered to garage in Bordeaux with yellow “engine locked” light on the dashboard (at 8 o’clock position). I have never seen this light before. The mechanic tried every trick for one hour at roadside, before saying beyond him.

Garage won’t look at it for at least 10 days to 2 weeks as many other MH in front of us. Only way of moving is using low gear and starter motor for short distance (thankfully battery topped up by solar panels).

I will post what they find out……. But suspect it will not be cheap…..
 
Hi Folks, we too have a similar problem; the engine will spin but not start and the orange 'code' lamp on the dash is on. its a 1997 2.5 cdi in a Lunar campervan and we're stuck. The breakdown chap was looking for an obi socket but couldn't find one-----help please
Ta Peter
 
oppy said:
Hi Folks, we too have a similar problem; the engine will spin but not start and the orange 'code' lamp on the dash is on. its a 1997 2.5 cdi in a Lunar campervan and we're stuck. The breakdown chap was looking for an obi socket but couldn't find one-----help please
Ta Peter
Click to expand...

Peter,

As your vehicle has mechanical fuel injection, it is possible to have the immobiliser removed from the pump. This will reduce vehicle security, and may also affect your insurance.

If you google "Fiat Ducato immobiliser" or similar it should return several threads on this and other forums.
 
Communicator said:
Peter,

As your vehicle has mechanical fuel injection, it is possible to have the immobiliser removed from the pump. This will reduce vehicle security, and may also affect your insurance.

If you google "Fiat Ducato immobiliser" or similar it should return several threads on this and other forums.
Click to expand...
Thank you for the info, as a 75 year old numpty logic seems to elude me. Are you able to post links that may help me?
Regards
Peter
 
Last edited:
Wordingh & Penquin,

Are you aware that there is an emergency starting procedure, which IS applicable to diesel vehicles. The procedure is fiddly, but is detailed in the vehicle handbook.

Perhaps the more difficult bit may be obtaining the 5 digit code applicable to your vehicle. It may be on a credit card sized card in the vehicle documentation. Such a card will also show the 4 digit physical key code.

For obvious reasons, the card should not be left in the vehicle.

In the UK this information is often withheld at the behest of the insurance industry, possibly their Thatcham centre.
 

fiat u0426-63​


Long story short I picked up a 2016 Fiat ducato 130 35 lwb it ran well for the last few weeks. I got in yesterday morning and an engine lock Imobillieser was on. I had a guy come with diagnostics but he can't clear this code could anyone shed any light on what is going on and a potential fix if there is a thing or is it, main dealer, only?
 

Attachments

  • faultcode.jpg
    faultcode.jpg
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Apologies I never listed the model

I believe the van is an x290 with the Iveco F1AE3481D ENGINE

The code below is listed as "Immobiliser circuit/component protection time out"

fiat u0426-63​


Any input would be great, I have an Auto electrician coming on Tuesday but just trying to pre-empt if he can't solve the issue if there is anything others have found that might be the cause of it.
 
wordingh said:
Hi,

I have a 2013 Ducato Multijet 130 based motorhome which is stuck with the immobiliser light permanently on. The engine will turn over but obviously will not start.

I have checked fuses, battery and tried to start it with the spare key but no luck so far. I have then checked the two wires to the immobiliser aerial surrounding the ignition lock, but they seem to be connected ok.
I was planning on tracing continuity from the aerial to the body computer connector A, but I cannot see any sign of the white/brown and white/grey cables in the Blue Delphi connector block, not sure why !?

I am not sure if maybe the ECU and the keys have fallen out of sync with their codes, but I don't know if this is likely or not.

I would appreciate any advice on anything else I can check,

Br

Paul
Click to expand...
A silly question but has the inertia fuel switch been activated? That caused the same issue on my 96 ducato. Black press switch next to battery on bulkhead on mine.
 
Just had the Auto electrician out, he found an earth wire burnt out in the fuse box under the bonnet at the passenger side headlamp, a few fuses are burnt and the fuse box is needing to be replaced. There were also signs of water ingress into the fuse box, hopefully, this is the root of my problem and I can get this van back on the road as soon as possible.
 
I think that both @Anthony489 and @rayc may be able to supply the requested info, if approached politely.

I was wondering what the function of an earth wire was in the engine bay fusebox (B001), as I am not aware of any in my earlier x244.

I see that on the x250, there is a relay coil earth connection for relay T08, which controls the positive for the heater/aircon fan.

Typically black (N) appears to be used for direct connection to chassis earth points, with black/violet (NZ) when there is an intermediate connection.

I have a saved copy of the aircon wiring, which I will attach, but the definition of the diagram is so poor as to be unreadable for colour codes. See B001 in top RH corner.
 

Attachments

  • X250 Airconditioning.pdf
    772.3 KB · Views: 44
Communicator said:
I think that both @Anthony489 and @rayc may be able to supply the requested info, if approached politely.

I was wondering what the function of an earth wire was in the engine bay fusebox (B001), as I am not aware of any in my earlier x244.

I see that on the x250, there is a relay coil earth connection for relay T08, which controls the positive for the heater/aircon fan.

Typically black (N) appears to be used for direct connection to chassis earth points, with black/violet (NZ) when there is an intermediate connection.

I have a saved copy of the aircon wiring, which I will attach, but the definition of the diagram is so poor as to be unreadable for colour codes. See B001 in top RH corner.
Click to expand...
Many thanks Communicator I shall pm the members you suggested.
 
Communicator said:
I think that both @Anthony489 and @rayc may be able to supply the requested info, if approached politely.

I was wondering what the function of an earth wire was in the engine bay fusebox (B001), as I am not aware of any in my earlier x244.

I see that on the x250, there is a relay coil earth connection for relay T08, which controls the positive for the heater/aircon fan.

Typically black (N) appears to be used for direct connection to chassis earth points, with black/violet (NZ) when there is an intermediate connection.

I have a saved copy of the aircon wiring, which I will attach, but the definition of the diagram is so poor as to be unreadable for colour codes. See B001 in top RH corner.
Click to expand...
Just having a look at the attachment there, component code C010 is listed as left front earth. Could that possibly be grouped into the loom and be the issue?
 
Hi amcfad

I only have information for the X250 model (2006 to 2014), but as the later X290 was mostly a facelift the electrical arrangements are probably similar. Beware that Fiat have chopped and changed electrical details and wiring colours, so it's only a guide !

The engine bay "fusebox" is a combination of Fuses, Relays and Multi-pole connectors. It is described variously in Fiat information as "Engine Compartment junction Unit", "CVM" and "B001". There are 6 connectors:

Connector A 32 pin
Connector B 3 pin
Connector C 32 pin
Connector D 2 pin
Connector E 3 pin
Connector X 1 pin (Bolted connection on main feed from battery)

The two 32 pin connectors are used for low current connections with thin wires. The 2 and 3 pin connectors are for higher power loads with thicker wires. In general, all of this unit sits on the 12 volt supply side, so no earth connections are involved. As Communicator mentions, the only earth connection in the X250 setup is a thin Black/Violet wire on Pin 26 of Connector A which earths the coil of the Relay for the blower fan in the cab. This wire goes to the left front earth C010 , which is shared by nine other electrical components. Quite how and where these all join together onto the black wire to the earth is not clear, but there may be joints within the loom.

If items really are burned out, that would suggest that very large currents have flowed where they shouldn't, suggesting a short circuit. However, even in the extreme case of the bolted earth connection to C001 becoming detached, it wouldn't be possible for excess earth current from the other components to somehow "back feed" via the blower fan relay coil as its resistance will limit the current to something quite low. Burnt components have a characteristic lingering smell.

If you have had water ingress it can cause electrolytic corrosion (even when the vehicle is parked up). The leakage current flowing through the impure water causes metal items to corrode and turn black. In extreme cases the corrosion can cause connections to be eaten away completely. I'm just wondering if this blackening is being mistaken for burning ? If you want future reliability, I would advise replacing the junction unit rather than attempting to clean off corrosion. You can transfer over all the fuses and relays. Take a good look for corroded pins in the loom connectors though, if these are not being replaced.

I attach a couple of diagrams for the Junction Unit and for the Climate Control / Blower Fan
 

Attachments

  • X250 Manual Climate Control.jpg
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  • X250 Power Supplies Sheet 1.jpg
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Anthony489 said:
Hi amcfad

I only have information for the X250 model (2006 to 2014), but as the later X290 was mostly a facelift the electrical arrangements are probably similar. Beware that Fiat have chopped and changed electrical details and wiring colours, so it's only a guide !

The engine bay "fusebox" is a combination of Fuses, Relays and Multi-pole connectors. It is described variously in Fiat information as "Engine Compartment junction Unit", "CVM" and "B001". There are 6 connectors:

Connector A 32 pin
Connector B 3 pin
Connector C 32 pin
Connector D 2 pin
Connector E 3 pin
Connector X 1 pin (Bolted connection on main feed from battery)

The two 32 pin connectors are used for low current connections with thin wires. The 2 and 3 pin connectors are for higher power loads with thicker wires. In general, all of this unit sits on the 12 volt supply side, so no earth connections are involved. As Communicator mentions, the only earth connection in the X250 setup is a thin Black/Violet wire on Pin 26 of Connector A which earths the coil of the Relay for the blower fan in the cab. This wire goes to the left front earth C010 , which is shared by nine other electrical components. Quite how and where these all join together onto the black wire to the earth is not clear, but there may be joints within the loom.

If items really are burned out, that would suggest that very large currents have flowed where they shouldn't, suggesting a short circuit. However, even in the extreme case of the bolted earth connection to C001 becoming detached, it wouldn't be possible for excess earth current from the other components to somehow "back feed" via the blower fan relay coil as its resistance will limit the current to something quite low. Burnt components have a characteristic lingering smell.

If you have had water ingress it can cause electrolytic corrosion (even when the vehicle is parked up). The leakage current flowing through the impure water causes metal items to corrode and turn black. In extreme cases the corrosion can cause connections to be eaten away completely. I'm just wondering if this blackening is being mistaken for burning ? If you want future reliability, I would advise replacing the junction unit rather than attempting to clean off corrosion. You can transfer over all the fuses and relays. Take a good look for corroded pins in the loom connectors though, if these are not being replaced.

I attach a couple of diagrams for the Junction Unit and for the Climate Control / Blower Fan
Click to expand...
Thank you very much for this Anthony489 I have ordered a new fusebox complete with relays etc. as there was definitely signs of the fusebox slightly melting and a distinct smell of smoke. The only concern is this earth issue, and that it is indeed the cause of the immobiliser being stuck on. I will forward this post on to the auto electrician as it could prove invaluable to him.

Once again many thanks.

Andy
 
Last edited:
Anthony489 said:
Hi amcfad
==================================================================================================
As Communicator mentions, the only earth connection in the X250 setup is a thin Black/Violet wire on Pin 26 of Connector A which earths the coil of the Relay for the blower fan in the cab. This wire goes to the left front earth C010 , which is shared by nine other electrical components. Quite how and where these all join together onto the black wire to the earth is not clear, but there may be joints within the loom.
==================================================================================================
Click to expand...

Not all earths are created equal. Some are just a wire or two bolted to the chassis or body, while others are multipole connectors with a the part having the male pins which are all commoned, perhaps made from a single piece of metal, and bolted to the chassis, while the removeable section holds separate female receptacles which are connected to the individual wires.

Below is a picture of C010 on my x244, unfortunately this does not show the complete connector, as the original photo was taken for a general view of the radiator connections.
x244 LH Front Earth.jpg
 
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