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Opel Vivaro 2.5 CDTi 2006 - No start #

Posted by Dominic Casey on January 5, 2012, 1:12 pm

Year of Manufacture *: 2006
Engine Size and Code *: 2.5 cdti G9U 730
( Optional ) Scanner Used: Solus

Hi all and happy new year to everyone.I have the above vehicle in the workshop it was brought in on the back of a tow truck.Customer said it just died as he was driving like as if he just turned off the ignition.Usual codes showed up like heater plug circuit/preheating relay circuit,but one caught my attention code 1822 fuel pressure solenoid valve circuit.I noticed the wiring looked brittle and coroded from heat so I investigated.I checked and cleaned the connection and checked the wiring a few ins back into the loom and all seems ok.There are 2 wires a brown and a white.With ign on I'm getting 12.5 volts at the brown wire at the connector but I'm getting 3.5 volts at the white wire.This doesn't seem right surely one should be an earth or is it a switch wire ? Could any one throw any light on this ?
Thanks in advance Dominic.

Re: Opel Vivaro No Start

Posted by Chris Angus <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5111' width='330' height='300' border=0 style='border:none;'> on January 5, 2012, 2:07 pm, in reply to "Opel Vivaro No Start"

Dominic, it sounds like a fuel pump problem, can you get someone to crank it over while you're squeezing the fuel priming bulb and see if it starts?

Chris

Re: Opel Vivaro No Start

Posted by Dominic Casey on January 5, 2012, 2:55 pm, in reply to "Re: Opel Vivaro No Start"
Message modified by board administrator January 10, 2012, 12:45 pm

Hi Chris thanks for getting back.I tried your suggestion but to no avail.The customer also mentioned a lack of highend power for a few months before this happened so I wonder is it a pump problem !! I know they have a habit of shearing the keyway on the lift pump.

Dominic

Re: Opel Vivaro No Start

Posted by Tony Attwood <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3025' width='330' height='300' border=0 style='border:none;'> on January 5, 2012, 3:49 pm, in reply to "Re: Opel Vivaro No Start"

Hi Dominic,
What other tests / checks have you done mate?
Live data whilst cranking?
Fuel pressure nominal & actual?
Resistance across terms 1 & 2 of the fuel pressure control valve?

Regards Tony

Re: Opel Vivaro No Start

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on January 6, 2012, 12:18 am, in reply to "Re: Opel Vivaro No Start"

Happy new year Tony

Classic

Modern cars, Its all wizardry and witchcraft

Re: Opel Vivaro No Start

Posted by Dominic Casey <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3313' width='330' height='300' border=0 style='border:none;'> on January 6, 2012, 10:31 am, in reply to "Re: Opel Vivaro No Start"
Dominic Casey

Hi Tony,

Happy New Year!
Fuel pressure while cranking:
actual: 1300 bar
nominal: 2700 bar
Resistance across terminal 1 & 2 on the fuel pressure control valve is 2.7 Ohms.
When the fuel pressure control valve is powered up by an external power source it clicks, but when connected up to the wiring loom in the van it doesn't seem to do anything. As I said earlier I have 12.5 volts on the brown wire and 3.5 volts on the white wire. Is this normal or should I be looking for a short in the loom?
Thanks,
Dominic

Re: Opel Vivaro No Start

Posted by Chris Angus <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5111' width='330' height='300' border=0 style='border:none;'> on January 6, 2012, 11:26 am, in reply to "Re: Opel Vivaro No Start"

Them pressure readings you have can't be right, could it be 130 & 270 bar??

You need to be seeing about 250 bar while cranking.
Check it again from ignition on and see what it starts at and builds to, may indicate if the pump is even trying to make pressure.

Is the fault code logged with just ignition on, which would indicate a solonoid fault? Or is it after a period of cranking, which would indicate a problem with the fuel supply or pump, and the solonoid is going out of range, trying to make pressure?

Not sure what tester you are using but tech 2 has actuator test for the solonoid so you can hear it clicking, you can't just supply a feed to this part, it is controlled by duty cycle or frequency etc. It's normally best to use a scope on the switching side and see what you get with ignition on and cranking, but then if it clicks when you're supplying a direct feed, then it's safe to say the solonoid works.

You need to check the fuel supply is good to the pump and also injector leak offs.

Hope that is of some help.

Re: Opel Vivaro No Start

Hi Dominic,

As Chris has said the IMV is controlled via a duty cycle (PWM)signal from the ECU.

The best way to monitor it would be via a scope, but you should get an idea by connecting a multimeter set to duty cycle.

Hth

Mark

Modern cars, Its all wizardry and witchcraft

Re: Opel Vivaro No Start

Posted by Bryan Smith <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5330' width='330' height='300' border=0 style='border:none;'> on January 7, 2012, 12:32 pm, in reply to "Re: Opel Vivaro No Start"

Hi Dominic,
As Chris has mentioned your pressures don't look right. You yourself have mentioned the key/drive shaft on the lift pump, have you checked this yet? It only takes a few mins to do.
Regards,
Bryan.
PS, Forgot to say, in relation to your question about voltage, that as Chris and Mark say, this is probably PWM, so you wont get the same volts as a supply or earth. It will vary according to the duty cycle. HTH's

Re: Opel Vivaro No Start

Posted by Piotr Sokolowski <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1848' width='330' height='300' border=0 style='border:none;'> on January 8, 2012, 11:12 am, in reply to "Re: Opel Vivaro No Start"

have you done injector back leak test?

Link: www.pandpauto.eu

Re: Opel Vivaro 2.5 CDTi 2006 - No start #

Posted by Bryan Smith <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5330' width='330' height='300' border=0 style='border:none;'> on January 14, 2012, 2:23 pm, in reply to "Opel Vivaro 2.5 CDTi 2006 - No start #"
Bryan Smith

Have you got any further with this yet Dominic?
Bryan.

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