XC90 PEM / FCU replacement tutorial
#41
07-23-2019, 12:54 PM
#42
07-23-2019, 02:22 PM
PEM Location
If it is not in front of rear passenger wheel, then someone relocated it, usually under rear seat area, but could be out of site, but has to be somewhere for vehicle cannot run without it.
#43
07-31-2019, 05:37 PM
never find
hello guys, after many attempts to want to find the PEM in my XC90 2017 and not find it, and knowing that the problem was that there was no current to the fuel pump, (look inside the car even until you reach the dashboard behind the glove compartment, lower the fuel tank, look at the two rear dashboards) I decided to look for a switch current in the fuse box under the steering wheel and carry a line that connects to the BLUE wire (current) that reaches the pump and ready, my auto works perfectly, it should be noted that the PEM regulates the speed of the fuel pump and therefore the pressure with which it works, now only works at 100
#44
01-31-2020, 01:56 PM
Having fuel issues with 2011 xc90 V8. Fuel pressure sensor has been replaced. Fuel pump runs when jumped. I want to replace the PEM next before taking it to the dealer. Is it located in the right rear wheel well on this model year? I have heard that it may be necessary to have the PEM programed by the dealer. Is there any truth to this or should a used one from the junkyard or ebay be plug and play?
#45
01-31-2020, 06:59 PM
Junior Member
Having fuel issues with 2011 xc90 V8. Fuel pressure sensor has been replaced. Fuel pump runs when jumped. I want to replace the PEM next before taking it to the dealer. Is it located in the right rear wheel well on this model year? I have heard that it may be necessary to have the PEM programed by the dealer. Is there any truth to this or should a used one from the junkyard or ebay be plug and play?
#46
02-02-2020, 09:51 AM
#47
02-02-2020, 10:17 AM
Junior Member
My 2006 xc90 PEM was under middle passenger side seat, under carpet etc...
i replaced my PEM didn't have it programmed.
what eventually fixed my problem was replacing fuel pump. I really can't say for sure PEMs don't need programming. I'm a decent mechanic, but not a professional. When in doubt, I used a local pro to diagnose my Volvo. Programming parts, or not, on Volvo's is can be a mystery. I replaced my throttle body, forums guy a service writer for Volvo dealer out of CA said throttle body didn't need programming, local dealer said it did, in the end, local dealer admitted they were wrong... but in the ultimate end (pun intended) I had to put in a new ECM for $2000 (that needed programming).
that was a few years ago... other problems have raised their ugly f'n head... I got rid of the money pit.
will NEVER own a Volvo again. Sorry for the negative response, but having to give in to the only local dealer has soured me big with this brand of car.
good luck to you.
i replaced my PEM didn't have it programmed.
what eventually fixed my problem was replacing fuel pump. I really can't say for sure PEMs don't need programming. I'm a decent mechanic, but not a professional. When in doubt, I used a local pro to diagnose my Volvo. Programming parts, or not, on Volvo's is can be a mystery. I replaced my throttle body, forums guy a service writer for Volvo dealer out of CA said throttle body didn't need programming, local dealer said it did, in the end, local dealer admitted they were wrong... but in the ultimate end (pun intended) I had to put in a new ECM for $2000 (that needed programming).
that was a few years ago... other problems have raised their ugly f'n head... I got rid of the money pit.
will NEVER own a Volvo again. Sorry for the negative response, but having to give in to the only local dealer has soured me big with this brand of car.
good luck to you.
#48
12-20-2020, 08:40 PM
Pem
I'm posting this tutorial because finding XC90 specific information on the web for this was pretty limited. This covers the removal and replacement of the Fuel Control Unit (FCU) also known as the Pump Electronic Module (PEM). From here on out I'll refer to it as the PEM.
First let me share what led to me replacing this on my XC90. I was having intermittent hesitation issues. It began as slight intermittent hesitation on the highway to the car stalling and eventually not starting leaving me stranded. See the following thread for more information:
https://volvoforums.com/forum/volvo-...y-ideas-70511/
Car:
2005 XC90 / 2.5T / FWD
Codes:
P0089 (fuel pressure regulator)
P2177 (system too lean off idle)
P0087 (fuel rail pressure too low)
Interventions:
1. Replaced the fuel pressure sensor (no change)
2. Replaced spark plugs (no change)
3. Replaced fuel filter (car ran perfectly for a few weeks, self clearing the CEL)
4. Ran some Seafoam cleaner through a tank of gas (car continued to run fine)
5. Cleaned MAF (no change)
6. Replaced fuel pump (no change)
The car would run fine after sitting for a few days making me think whatever I replaced fixed the issue only to have the issue resurface within a week or so. This finally lead to the one thing I hadn't looked at yet which was the PEM.
Removal and Replacement of the PEM
1. Disconnect the negative terminal of the battery before you begin.
2. Jack the passenger rear side of the car up and remove the passenger rear wheel.
3. Remove the two plastic nuts that hold the wheel well liner in place with a 10mm socket.
4. The PEM is located behind the front portion of the wheel well liner. You have to carefully peel it away from the plastic moulding. Once free I closed the back door on the liner to keep it out of my way while working.
Attachment 17018
Attachment 17019
5. The PEM sits in a bracket that's attached to the chassis. Get your fingers behind the bracket to work it free.
Attachment 17020
6. Remove the PEM from the bracket and unplug the electrical connection. If yours is corroded like mine was this will take patience and time. Just keep working the plug back and forth until it lets loose. In fact I ended up breaking the locking tab before getting it apart.
7. Check your plug connections to see if they're corroded. If it is (like mine was) take a little time to remove the corrosion with something abrasive making sure not to damage the plug. This will help ensure a good connection.
Attachment 17021
Attachment 17022
Attachment 17023
8. Plug in new PEM, replace in old bracket and reattach to the chassis.
NOTE: There is a way to relocate the PEM to the interior of the car. I decided against this. The first one lasted 7 years and 200K miles so I feel confident the new one will last as long as I need it to. With that said the location of the PEM in these cars is pretty dumb. As an alternative Xemodex offers a waterproof version.
9. Replace the wheel liner and secure with two plastic nuts.
10. Replace wheel and reconnect the battery.
Hope this helps others. Good luck!
First let me share what led to me replacing this on my XC90. I was having intermittent hesitation issues. It began as slight intermittent hesitation on the highway to the car stalling and eventually not starting leaving me stranded. See the following thread for more information:
https://volvoforums.com/forum/volvo-...y-ideas-70511/
Car:
2005 XC90 / 2.5T / FWD
Codes:
P0089 (fuel pressure regulator)
P2177 (system too lean off idle)
P0087 (fuel rail pressure too low)
Interventions:
1. Replaced the fuel pressure sensor (no change)
2. Replaced spark plugs (no change)
3. Replaced fuel filter (car ran perfectly for a few weeks, self clearing the CEL)
4. Ran some Seafoam cleaner through a tank of gas (car continued to run fine)
5. Cleaned MAF (no change)
6. Replaced fuel pump (no change)
The car would run fine after sitting for a few days making me think whatever I replaced fixed the issue only to have the issue resurface within a week or so. This finally lead to the one thing I hadn't looked at yet which was the PEM.
Removal and Replacement of the PEM
1. Disconnect the negative terminal of the battery before you begin.
2. Jack the passenger rear side of the car up and remove the passenger rear wheel.
3. Remove the two plastic nuts that hold the wheel well liner in place with a 10mm socket.
4. The PEM is located behind the front portion of the wheel well liner. You have to carefully peel it away from the plastic moulding. Once free I closed the back door on the liner to keep it out of my way while working.
Attachment 17018
Attachment 17019
5. The PEM sits in a bracket that's attached to the chassis. Get your fingers behind the bracket to work it free.
Attachment 17020
6. Remove the PEM from the bracket and unplug the electrical connection. If yours is corroded like mine was this will take patience and time. Just keep working the plug back and forth until it lets loose. In fact I ended up breaking the locking tab before getting it apart.
7. Check your plug connections to see if they're corroded. If it is (like mine was) take a little time to remove the corrosion with something abrasive making sure not to damage the plug. This will help ensure a good connection.
Attachment 17021
Attachment 17022
Attachment 17023
8. Plug in new PEM, replace in old bracket and reattach to the chassis.
NOTE: There is a way to relocate the PEM to the interior of the car. I decided against this. The first one lasted 7 years and 200K miles so I feel confident the new one will last as long as I need it to. With that said the location of the PEM in these cars is pretty dumb. As an alternative Xemodex offers a waterproof version.
9. Replace the wheel liner and secure with two plastic nuts.
10. Replace wheel and reconnect the battery.
Hope this helps others. Good luck!
#49
12-23-2020, 05:02 AM
2007 xc70 Volvo
hi I'm in Australia. Purchased a 2007 xx70 Volvo wagon. Recently put new fuel pump in an car still wont start . I'm just wondering if my model has a pem an if so were would it be located
#50
06-09-2022, 02:27 PM
#51
06-09-2022, 02:29 PM
#52
06-09-2022, 02:52 PM
#53
06-09-2022, 02:53 PM
I'm not sure where it would be located for sure. My gut tells me under the second row just because not all XC90s had 3rd rows. As mentioned in this thread, mine was jammed up behind the wheel well liner on the rear passenger side.
Good luck!
#54
07-12-2022, 11:15 AM
#55
07-13-2022, 02:20 PM
Thread
Thread Starter
Forum
Replies
Last Post
trg
For Sale / Trade - Archive
0
12-10-2014 01:48 PM
