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Vauxhall Vectra 2.2 Z22YH 2006 - Code P1191 fuel pressure to high (waveforms) - Fixed #

Posted by David Evason on September 27, 2013, 12:03 pm

Year of Manufacture *: 2006
Engine Size and Code *: 2.2 Z22YH

Afternoon gents,need alittle help with a Vectra that's in at the moment as again its a system im not familiar with.
Vehicle will start & run for about 10 mins then cut out and will not restart until waiting 2 mins and cycling the ignition. It will also cut out if revved. Im aware of the siemens pump breaking down and this has a continental pump on it, but I thought these only resulted in low pressure faults.
DTC P1191 Fuel pressure too high.
Live data desired 4999 Kpa watching actual you can see it rising slowly upto 14500 kpa and then it cuts out.
here are some images:
KOER :

KOER Cut out:

I can see that the duty only changes very slightly but not really a change in the current. Does this suggest a faulty pressure regulator or what should I measure next to help pin point.
Thanks,
Dave

Re: Vauxhall Vectra 2.2 P1191

Posted by Lee Mackintosh <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1348' width='330' height='300' border=0 style='border:none;'> on September 28, 2013, 1:21 pm, in reply to "Vauxhall Vectra 2.2 P1191"
Lee Mackintosh

I would think its a faulty pressure regulator, I had one of these in doing the exact same fault. Replaced regulator and it was perfect.

I supposev there is a slim chance it could be a failing frps but doubt it.

Also I can't see how an hp fuel pump would cause a high pressure fault code so to me this points to a control fault rather than a pump pressure issue. Low pressure is a different situation though isn't it?

Re: Vauxhall Vectra 2.2 P1191

Posted by Carl ford <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1822' width='330' height='300' border=0 style='border:none;'> on September 28, 2013, 4:45 pm, in reply to "Re: Vauxhall Vectra 2.2 P1191"
Carl Ford

Looking at your waveforms it seems to me the ECU is trying to reduce fuel pressure but it carnt, I would like to see your current trace clearer but on the face I it looks like a faulty regulator.

Carl

Re: Vauxhall Vectra 2.2 P1191

Posted by david evason <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3433' width='330' height='300' border=0 style='border:none;'> on September 30, 2013, 9:31 pm, in reply to "Re: Vauxhall Vectra 2.2 P1191"

Thanks for the reply guys,
Im along the same train of thought that its a regulator as it looks like the ECU is controlling it. Also when giving the regulator a little tap whilst running the fuel pressure bounces all over the place.
Im with you on the theory Lee that the hp pump shouldn't cause a high pressure issue.
Not a fix yet as my customer doesn't want to pay the dealer price but as far as I can tell its a dealer only part.
Thanks again for the help
Dave

Re: Vauxhall Vectra 2.2 P1191

Posted by Kevin Apps <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2589' width='330' height='300' border=0 style='border:none;'> on September 30, 2013, 11:12 pm, in reply to "Re: Vauxhall Vectra 2.2 P1191"
Kevin Apps

David
The regulator has been updated many times, so make sure you only fit a genuine one.

Cheaper than a pump !

Kev.

Re: Vauxhall Vectra 2.2 P1191

Posted by Liam Boyle <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5195' width='330' height='300' border=0 style='border:none;'> on October 1, 2013, 4:32 am, in reply to "Re: Vauxhall Vectra 2.2 P1191"
Liam Boyle

I haven't seen this fault for a while but up until a couple of years ago I was still getting these changed for free at the Vauxhall dealer on 2.2 Vectra, Signum and Zafira models. I think it was after Watchdog investigating the sudden cutting out problem and how it could cause an accident. The last one I took in was a 2005 Vectra Elite and that was around November 2011. There was a recall/field remedy number I used to quote from TIS that ensured the work was put through.
Might be worth seeing if they will still honour the extended warranty on the regulator. They would never just supply the part to me on an exchange basis but would always want to do the job themselves which may be a pain depending on how far the dealership is and how quickly they can book it in. However you could always send the customer to them.
I also noticed that everyone I had changed would return with 1 male torx head bolt and 1 female. If yours has 2 odd bolts it may have been changed already.

Liam

Fixed #

Posted by David Evason on October 1, 2013, 10:14 pm, in reply to "Re: Vauxhall Vectra 2.2 P1191"
Edited by board administrator October 2, 2013, 4:08 pm

Thanks Kevin & Liam,
I did come across a few articles regarding the watchdog situation and the regulator that's has a few revisions.
I did explain to my customer about the recall etc but instead he bit the bullet and bought a genuine one.
Not 100% confirmed as a fix yet as I only got it 15 mins before closing time but I managed to get a quick capture of the new regulator and the live data was looking positive. Just needs final running time and test drive for me to be totally happy !!
Thanks for everyones help !!

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