My brother has a Jaguar X-Type 2.0 diesel. Just last week it cut out and he thought it had run out of fuel because it was low. He filled it up and it started straight away. He thought that was that until it happened again after about 25 miles. The engine cut out and would not re-start. He cranked it over, and it sounded like it wanted to fire but it wouldn't. He left it for about 20 minutes and it started again and ran normally.
He drove for about 3 miles and it cut out again. I went out to him and towed him back to my house where I had a look at it. It's a TDCi common rail system and no indication had lit up on the dash. I have VCDS, the VAG diagnostic software which also does OBDII on many other makes, but it will not communicate with this.
I removed the fuel hoses from the fuel filter and drew fuel up with a hand primer. No problem there. I got him to crank the engine while I forced fuel on to the main injection pump and it still would not start. That makes me suspect that the main fuel pump could be faulty, or some other sensor which leads to the ECU switching the pump off. Then it started again. I checked the connections on the main fuel pump and on the fuel pressure sensor. Needless to say it broke down again after another 3 miles.
Check the cam & crank sensors. Prone to iether. check the metal fuel pipes for kinks around the rear wheen arch. Carry out an injector laek back test. fuel rail pressure could be dropping although it normally logs a fault. check the wiring to the fuel rail pressure sensor. Should be able to comm with EOBD if its O4 model.
Thanks for that. I do suspect it might be the camshaft sensor but I didn't know if that would cause the engine to cut out and not re-start. I'm certain it isn't a fuel delivery fault on the low pressure side because I've already checked to see how well it draws fuel with a hand primer. There seems to be no problem there. Also when it does cut out it does so just like you've switched off the ignition. That suggests to me it's electrical.
It could be the fuel pressure sensor, or the main pump may not be delivering sufficient pressure under certain conditions. Or if it's a camshaft sensor fault the ECU may be switching the pump off, but I'm not certain of that because I don't know how this particular system works.
VCDS or VAGCOM as it was previously known is the full works for VW, Audi, Skoda and Seat. It also has a OBD II function for other makes, but it will not connect with everything presumably because of different protocols. Unfortunately it won't communicate with Jag either, or many other Ford diesels so I'm told.....