Xantia diesel turbo/ecu problem?

Sounds more like diesel problem rather than electrics.

JOhn

True, the HBOL says injector problems. But it came on very suddenly, i.e. yesterday it was fine and this morning it wasn't so I was wondering if the ECU had a master reset type thingy.

Sticky injectors, you can get them checked at a diesel specialists.

The ECU only controls pump timing and EGR.

For some reason it sounds like it is massivly overfuelling at low revs, but without looking at the actual vehicle its virtually impossible to say for definate.

However a *very* good starting point (sarcasm) would be to re-instate the fuse and see if it is then back to normal!

Tim..

I might be daft but I'm not that stupid. The fuse was pulled, examined and replaced.

When you say replaced, do you mean replaced with a new one (i.e. it was previously blown), or just the old one (with nothing wrong with it) put back in? If replaced with a new one due to the original being blown, it's entirely feasible that the same fault that caused the old fuse to blow could have blown the new one.

It wasn't blown nor did I expect it to be. It was just one other thing to check when the air con didn't work. Lets not go down this route, I pulled the fuse because it powered the aircon cutout relay as well as the ECU. All I wanted to know was whether this could cause the ECU to reset to a "get you home" setting.

Malc ( snipped-for-privacy@ubht.swest.nhs.uk) gurgled happily, sounding much like they were saying :

Does it even have an ECU? Earlier Xant Ds didn't, and I think that was around the change-over era.

Does it have the keypad immobiliser?

There's a circuit board in a plastic box just behind the driver's side headlight.

Yes

Malc ( snipped-for-privacy@ubht.swest.nhs.uk) gurgled happily, sounding much like they were saying :

Furry muff. Definitely after the point where the lump gained an ECU, then.

But, no, I can't see that the default settings (I don't think it's a "learning" ECU, anyway) would cause the problems you're having. I think it's more fundamental.

Ok thanks. It's booked in to the garage on Thursday unless I can crack the problem before then.

ECU on an XUD9 engine - you've got to be joking. It's an old tech indirect injection engine using either a Bosch or Girling mechanical diesel pump.

If you are talking about a 2.0 HDi then that's a different matter.

/John

Tis true, well sorta, the later immobilzier equiped XUDT's had a unit on the pump and another which controls the immobilizer and also the pump timing and EGR.

Its solid state, and more a logic controller rather than a computer that responds to sensors and calculates something.

Tim..

Tell us what cured when you fix it.

John Kenyon ( snipped-for-privacy@gmx.net) gurgled happily, sounding much like they were saying :

Wrong... It's certainly an old tech indirect injection lump, but later ones did indeed use an electronic pump with ECU.

The owners manual shows a fuse marked ECU and there is a PCB behind the headlight which sort of looks big enough to be that kind of thing. But the owners manual does cover a few varieties of the car.

At least the fuse descriptins in the owner's manual seem to agree with reality, the HBoL fuse descriptions don't tally at all. No how, no way.

The 2.0l HDi engine had common rail. The 1.9l XUD9 had/has a mechanical pump.

/John

John Kenyon ( snipped-for-privacy@gmx.net) gurgled happily, sounding much like they were saying :

Yes.

Earlier ones did. Later ones had an electronic pump. How do you think the keypad immobiliser works on later 1.9D/TD Xants/ZXs/etc?

Clue : Not on the ignition circuit.

Anyway see my post up there ^

The EGR valve is being held open by something electrical which is driven by the ECU