IPD sale XeMODeX - Experts in Volvo Electronics

Get email notification of topic replies. Log in or register (free). Amazon Link Buy anything with this and it helps MVS!

Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
ondatrack
Posts: 3
Joined: Thu Apr 02, 2020 7:38 pm
Year and Model: 2004 XC90
Location: California

Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Post by ondatrack »

My 2004 2.5t AWD XC90 with 130k miles stalled and then would not start while driving home from work. There has never been any starting or hesitation issue prior. Gas tank is 3/4 full. I pulled a code P0089 with my Torque App. I didn’t have a pressure gage but there is no pressure at the fuel rail and just a few drops of gas drip out of the Schrader valve both while cranking and with key in the on position. I also checked the Schrader valve right before the fuel filter to make sure it wasn’t a clogged filter, it didn’t have any pressure either. My first thought was the fuel pump fuse, it was good. I swapped the relay under the dash with the fog light relay that was identical and no change so then I figured it was the fuel pump. In checking this forum and others I read it could also be the Fuel pressure sensor mounted on the fuel rail, which this one does not have or the PEM/FCU. I read the tutorial for a 2005 2.5t XC90 and started looking for the PEM/FCU. I pulled both rear fender liners with the wheels off and it wasn’t there. I pulled both rear rows of seats out along with the side panels and carpet. Still no sign of a PEM/FCU. I did pull the cover off the fuel pump and could not hear anything with the ignition switch on or while cranking. I unhooked the connector and put power directly to the pump and it turned on fine. There are three other smaller wires in the connector that go toward the rear but I could not trace them to anything without tearing the whole rear harness apart. I am at a loss now. I found a couple of threads on a forum that allude to some 2003 or 2004 models not having a PEM/FCU but the threads died with no confirmation that this is the case. Does anyone know for sure that this year and model does not have one? If it doesn’t other than the relay is there anything that would keep the pump from working? Thanks in advance.
wanderdüne
Posts: 208
Joined: Thu May 18, 2017 5:24 pm
Year and Model: 2004, 2006 XC90 2.5T
Location: kitchen
Has thanked: 4 times
Been thanked: 40 times

Re: Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Post by wanderdüne »

User avatar
abscate
MVS Moderator
Posts: 22460
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 376 times
Been thanked: 1170 times

Re: Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Post by abscate »

Behind liner in the XC90 models, right rear wheel IIRC
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
User avatar
ggleavitt
Posts: 424
Joined: Sun Jun 04, 2006 11:33 pm
Year and Model: XC90 05-2.5T, 08-V8S
Location: Seattle
Been thanked: 61 times

Re: Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Post by ggleavitt »

https://forums.swedespeed.com/showthrea ... M-Location

Some alternate PNs as well in the thread IIRC.
2005 2.5T AWD-201k
2008 V8 AWD Sport-132k
jimmy57
Posts: 6634
Joined: Fri Nov 12, 2010 9:25 am
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas
Has thanked: 4 times
Been thanked: 264 times

Re: Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Post by jimmy57 »

If you have the 0089 code then you do have a pressure sensor on the end of fuel rail:
FPS.jpg
FPS.jpg (9.06 KiB) Viewed 126 times
FPS.jpg
FPS.jpg (9.06 KiB) Viewed 126 times
and you have the PEM and it should be in front of RR tire under liner if it has not been relocated inside under rear cargo floor.
ondatrack
Posts: 3
Joined: Thu Apr 02, 2020 7:38 pm
Year and Model: 2004 XC90
Location: California

Re: Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Post by ondatrack »

Thank you for the responses. Unfortunately there is no pressure sensor on either end of the rails. There is no PEM in either of the rear fender/wheel wells, checked very thoroughly. I have pulled every piece of carpet, pad or interior trim out that is in back of the front seats and nothing. Unless it is under the floor pan on top of the gas tank I have looked everywhere.
jimmy57
Posts: 6634
Joined: Fri Nov 12, 2010 9:25 am
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas
Has thanked: 4 times
Been thanked: 264 times

Re: Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Post by jimmy57 »

That is strange. The low fuel pressure code is only possible when it has a way to monitor fuel pressure. That sensor shown is on the driver's end of the fuel rail acting as the end plug when it is there. If it has the code then it should have the sensor or it would have the codes for open or high signal for the fuel temp pressure sensor.
ondatrack
Posts: 3
Joined: Thu Apr 02, 2020 7:38 pm
Year and Model: 2004 XC90
Location: California

Re: Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Post by ondatrack »

I thought it was strange also. There is a plug on the drivers side and a Schrader valve on the drivers side. In my reading I found other references and pictures that showed a 2004 2.5t without the fuel pressure sensor. Thanks.
User avatar
abscate
MVS Moderator
Posts: 22460
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 376 times
Been thanked: 1170 times

Re: Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Post by abscate »

The OEM could have been relocated inside or most anywhere, is there evidence of the old one under the liner?
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
User avatar
RickHaleParker
Posts: 4697
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 603 times

Re: Cannot find PEM/FCU in 2004 XC90 2.5t AWD

Post by RickHaleParker »

Get a second option from a different code reader. I cannot find a P0089 to Volvo XC90 2.5 translation before MY 2005.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Post Reply
  • Similar Topics
    Replies
    Views
    Last post