Technical 1997 Ducato 2.5TDI Bosch ECU wiring Diagram Required

[WeinsbergRP]

I Have been struggling for nearly two years to get my Weinsberg Motorhome fixed. IT been in more garages that i can count on my fingers and toes.
IT has a Rare 2.5 TDI Ducato Engine with a Bosch ECU & Air mass Sensor. I cannot find another vehicle with the same setup for spares etc.
The problem is the vehicle drives like it has no Turbo. a RED Square box light with no symbol Appears on the Dash instrument Panel which is listed in the Fiat manual I have as a fault with the Fuel injection System.
The engine runs perfectly and as I have said drives great but with no boast.
I have had Turbo fully reconditioned even though when off, I was told by the specialist it was perfect. This has now been ruled out. I have had Air Mass sensor off and paid to have it checked. This however is something I'm not confident about.
The only way forward I have been told is for a full wiring Diagram so ECU and all wiring can be checked.
I have a Specialist who is prepared to check and test if I Can provide a diagram.

Any help, Advice or other avenues to explore would be greatly appreciated.
Many Thanks
Peter

 

[Communicator]

Hi Peter,

I doubt that I can help, but here are some thoughts.

I was previously aware that a basic ECU was fitted to the 2.8idTD when EGR was fitted, but had not heard of an installation as early as yours.
Presumably yours is a Sofim engine. Do you have an engine code, which may be on the VIN plate as "Motore 8140.xx, 8144.xx, or something similar.
You have not mentioned the presence of a manifold pressure sensor, only the mass airflow sensor, or debimeter.
Perhaps irrelevant, but my 2.8jtd does not have a mass airflow sensor, only the pressure sensor.

Have a look at this site. The 8144.97Y may fit your description, but it is not listed as being fitted to the Ducato.

Is there any possibility that the engine has been replaced, with the red light originally being a high boost pressure warning?

 

[WeinsbergRP]

Hi Peter,

I doubt that I can help, but here are some thoughts.

I was previously aware that a basic ECU was fitted to the 2.8idTD when EGR was fitted, but had not heard of an installation as early as yours.
Presumably yours is a Sofim engine. Do you have an engine code, which may be on the VIN plate as "Motore 8140.xx, 8144.xx, or something similar.
You have not mentioned the presence of a manifold pressure sensor, only the mass airflow sensor, or debimeter.
Perhaps irrelevant, but my 2.8jtd does not have a mass airflow sensor, only the pressure sensor.

Have a look at this site. The 8144.97Y may fit your description, but it is not listed as being fitted to the Ducato.

Is there any possibility that the engine has been replaced, with the red light originally being a high boost pressure warning?

Many thanks for ideas.
Engine number in picture with engine bay pictures included

 

[WeinsbergRP]

Many thanks for ideas.
Engine number in picture with engine bay pictures included View attachment 440731

 

[Communicator]

From the VIN plate the engine is, or was a Sofim 8140.47R. From the link previously provided this was identical to the 8140.47, but with "the addition of an oxydation catalyst".

An internet search for this engine returns several results, including one relating to a Hymer MH. Perhaps a search for images would enable comparison with the vehicle to confirm the engine type.

A search of this forum for the 8140.47R also returns several results.

The 8140.47R would have a mechanical injection pump. If the electromechanical device illustrated in post #4 is to have any effect on output power, it will have to communicate with the injection pump, or the turbo. This could either electrically, via a mechanical link, or perhaps by vacuum. An inspection of the injection pump and vacuum pipes should reveal this.

I am not familiar with the Bosch VE injection pump, but it seems that fuel supply under boost conditions, is via a boost pressure hose connection to the boost housing. (This is subject to correction by others.) Is this hose in good condition, free from splits etc?

In short I am thinking outside the box, and suggesting an alternative cause for the loss of power.

I have owned several diesel vehicles over a period of many years, and at least one of them did have electrical connections to the injection pump, but I did not have cause to investigate further.