Alright, I need some help. My XC90 started up and then died one morning. There are no codes showing. I've narrowed it down to fuel not sending. I thought it was the fuel pump so I switched it out, but that didn't help. Also tested the old pump and it worked. I've read that the fuel control module is the problem, but I searched for it and can't find it, also doesn't seem to have it on the 2003 model. So.... what next?

 

Forgot to mention I checked all fuses and relays

 

Looks like its by or on top of the fuel tank - see pdf

 

that's what I thought at first, but if I look up the part by my vin it doesn't show my car having the part. Was this some inbetween before they added it?

 

what is your VIN?

 

YV1CZ59H331007798

 

Your PEM control unit is #30742823

We have them for $307.01

 

I have to be able to find and change it first hah

 

looks like there was an earlier thread talking about this ...

https://volvoforums.com/forum/volvo-...utorial-71534/

 

I saw that one. It showed me the wheel well and under rear passenger seat, but no luck

 

There shouldn't be a PEM on a 2003. Just a fuel pump relay on the CEM (CMI12)

 

That's what I thought. I've been getting mixed information though. I've checked the relays as well. Is there any other part that wouldn't allow it to pump? There's a solenoid or something right behind the tank above the spare tire that's connected to the gas. I've never worked on a Volvo, but I'm starting to understand why they cost so much to repair.

 

Do you have power to the pump when cranking?

 

Just checked it. I do. Anything that would make it not pump?

 

I also hooked the old pump up to power. It started and I can hear the pump when I turn the key. However it is not actually pumping fuel

 

Went through hell narrowing down problem, not easy. You should now check fuel pressure at rail, you need to know if you have proper pressure, around 43 lbs. is average. I made mistake of going for pump too, bad advice, pumps evidently don't go that often. If you are not getting codes, that makes it even more difficult. If pressure is not there, then change pressure regulator which is easy 1-2-3 solution, it is located on driver side of fuel rail if you have the 2.5 motor. Relays rarely go, of course, fuses do blow once in awhile, so put meter on fuse, looking at them sometimes does not show bad.

Good luck,

 

Well, the fuel problem turned out to be the Camshaft position sensor which I've never heard of causing a pump problem, but I unhooked it just messing around and boom....fuel. Switched it out now we have fuelat the rail, but still not starting. Going to check for spark next.

 

Turns out it was the camshaft sensor the whole time. I went out to check spark and thought maybe I should check fuses again. The ignition fuse was blown from all the excessive cranking I assume. Replaced it and bam! For anyone having this problem unplug the camshaft sensor and if fuel starts pumping that's it.

 

Just when you think you heard it all when working on Volvo issues, something new is discovered. God only knows what a cam position sensor has to do with fuel pressure, does not compute using common sense, but that is common on Volvo's. I will keep this in mind next time my fuel pressure drops.

As a side note, I was getting constant P0343 codes which indicate the camshaft sensor problem. I changed it, same problem. So I went further and checked cam pulleys, both were loose, excessive play and oil seal was starting to leak, so will replace and see if this solves constant P0343 codes.

 

Anyone know what a 2003 uses in replacement of the fuel pressure sensor in the later models?