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[hoofing it]

If code 19 shows with the managment light on then yes the crank sensor is dead its easy to replace just make sure its a dealer part and not off flea-bay.
What year is your car.

[Vulpine]

1997
Just decoding wiring diagrams for the diesel. I will post here when done.

[Vulpine]

ok here is the Engine Control Unit Circuit Wiring Diagram:

I think (please correct me if I am wrong) that all 3 items I have issues with share a common as suggested (circuits #323 to 333 at bottom).
Load Pressure Sensor (P65) = MAP Sensor = Fault Code 43?
Needle Movement Sensor (P66) = Injector 4 Sensor = Fault Code 81?
Crankshaft Sensor (P35) = Crankshaft Sensor = Fault Code 19?
Detail diagram to follow of this area.....
What does the dotted line represent on wires to P66 and P35?

[aaronjb]

IIRC a dotted line like that indicates a shielded wire set (pair, in these cases) that is usually connected to ground somewhere along the line for noise suppression.

[edit] You're right on the function of those sensors, btw.. I'm having trouble deciphering what the shielding is tied in to, though - any chance of a larger pic so the original writing is readable? Assuming you have the original

[Vulpine]

Here is a coloured in close up:

[Vulpine]

and a link to the full size original:
http://i988.photobucket.com/albums/af9/vulpine9/25tdlaterwiringfullsize.jpg
edit: ah fotobuket has resized so avail via email
Thanks to H@ynes

[aaronjb]

Perfect (Didn't realise Haynes had wiring diagrams!)

What confuses me is pins 13 & 36 - they both appear to be tied to that line (which seems to go to ground through the MAF? At least that's the implication) .. 36 being on one side of a .. relay? Meaning pin 36 sees no ground continuity if that line becomes energised and offset from ground?

I'm not sure.. though, but you're right, they're all on a common circuit so maybe there's a break somewhere in that wire run..

[edit] What are P67 and S43 (top of the diagram)?

[Vulpine]

line 36 is switched by temp sensor in the ECU box, i think..
P67 = Pedal Postion Sensor
S43 = Cruise Control Unit in Indicator Stalk

[Vulpine]

oh and the crank sensor is approx £100 plus VAT from GM.
Anyone got spare one or know where to get it from cheaper! Partco and Interpart couldnt find it listed.
Even part numbers would help my search!

[aaronjb]

I'll have another proper look at those diagrams tomorrow I think.

Oddly enough the crank sensor part came up just tonight in another post: http://www.omegaowners.com/forum/YaBB.pl?num=1282665059

Part number and trade prices there

[Vulpine]

Ah here is the crank sensor position:

and the full page here:
http://i988.photobucket.com/albums/af9/vulpine9/CrankSensorFullDesc.png
Need to set its distance from the flywheel when replacing - anyone know the air gap required?

[hoofing it]

oh and the crank sensor is approx £100 plus VAT from GM.
Anyone got spare one or know where to get it from cheaper! Partco and Interpart couldnt find it listed.
Even part numbers would help my search!

Just bought one today for £83.87 +vat on trade card

[Vulpine]

BTW some of the crank sensors for other omega's ie 3.0 v6 etc look very similar. Any idea if the sensor fits any other engines from omega's or other cars?

[hoofing it]

BTW some of the crank sensors for other omega's ie 3.0 v6 etc look very similar. Any idea if the sensor fits any other engines from omega's or other cars?

no the only ones that fit are for the x25td or the u25td engine

[Kneepad]

Ah here is the crank sensor position:

and the full page here:
http://i988.photobucket.com/albums/af9/vulpine9/CrankSensorFullDesc.png
Need to set its distance from the flywheel when replacing - anyone know the air gap required?

From what I can see in TIS:
Air gap is fixed by the position of the 'sensor holder'  which is in turn set using a special tool Reference Gauge KM-810-A .
So if you hav'nt removed the holder from the block you should be able to pop the sensor back in.