D5 (D5244T to 2005) Not starting

[5cilinder]

First make sure the regulator is ok or not
If its ok then the sensor and regulator are ruled out

Sometimes its hard to find a fault , then you have to systematicly rule components/sensors out
If the regulator turns out ok will think further , ill have some drawings of the pump

I had a bad connector on the fuelpressurerailvalve wich intermittantly shut down the engine
If i had asked volvo to trouble shoot that i guess they had changed everything according to the faultcodes and flowcharts
Point was that i measured the sensor and connector wich measured ok (for that moment) later i wiggeled it with a running engine and it replicated the fault

[doliver]

OK, I had to wait a while to borrow a pressure regulator as my one was chacking out fine.
The one I borrowed from a working D5 engine had no effect on the problem.

I installed my pressure regulator in other engine and I started fine - confirming beyond all doubt that the fault does not lie with it.

So, back to square1 re-checking all the basics........

After several hours of checking each component, and still founding no faults, I noticed a large fluctuation of the live rail pressure reading for a smll moment with the enigne being at rest for over 2 hours

With the pressure sensor consistantly checking out OK, I looked to the ECU as the problem. I removed and re-installed it, then tried to start the engine again ................ it started first time.

Looks like the ECU was not seated properly
Luky I spotted this as I was on the verge of sending it to volvo

thanks to all and especially 5cilinder for all yor help

[outnumbered]

well done and glad that you have sorted it.just goes to show what you have to do on these cars.
mike

[5cilinder]

Originally Posted by doliver

OK, I had to wait a while to borrow a pressure regulator as my one was chacking out fine.
The one I borrowed from a working D5 engine had no effect on the problem.

I installed my pressure regulator in other engine and I started fine - confirming beyond all doubt that the fault does not lie with it.

So, back to square1 re-checking all the basics........

After several hours of checking each component, and still founding no faults, I noticed a large fluctuation of the live rail pressure reading for a smll moment with the enigne being at rest for over 2 hours

With the pressure sensor consistantly checking out OK, I looked to the ECU as the problem. I removed and re-installed it, then tried to start the engine again ................ it started first time.

Looks like the ECU was not seated properly
Luky I spotted this as I was on the verge of sending it to volvo

thanks to all and especially 5cilinder for all yor help

Good news you solved it in the end!
Whats puzzling me is what you did with the ECU ? just disconnected it and connecting it?
It could be that the connector that connects all the sensors to the ECU was " loose" or internally a bit loose
Beware that if its an internal loose contactpoint (in the connector or in the ECU) that vibrations could disconnect and shut your engine down at random