ECM-261A Topic is solved

[DavidE7]

I refurbished a dead DEM in the XC70 and it just needed fresh fluid, new filter, and the new design metal cap. I don't remember the codes. The original stamped cap was still holding the very dirty/plugged filter in. The rear differential and bevel gear use the same gear oil so it is worth doing both of them when the car is raised for the DEM service. Get two bottles of gear oil to fill the correct amounts (measured quantity in each). I get to figure out a couple DEM errors on the new-to-me V70R when it gets warm again. I won't be surprised if it is a bad pump, plugged filter, and corroded circuit board.

[Vuym]

I refurbished a dead DEM in the XC70 and it just needed fresh fluid, new filter, and the new design metal cap. I don't remember the codes. The original stamped cap was still holding the very dirty/plugged filter in. The rear differential and bevel gear use the same gear oil so it is worth doing both of them when the car is raised for the DEM service. Get two bottles of gear oil to fill the correct amounts (measured quantity in each). I get to figure out a couple DEM errors on the new-to-me V70R when it gets warm again. I won't be surprised if it is a bad pump, plugged filter, and corroded circuit board.

Thank you both, very helpful.

I've just ordered haldex fluid, filter service kit and rear diff oil from my Volvo dealer to be collected tomorrow. I did see a video where someone managed to change the filter & AOC fluid without having to remove the exhaust and propshaft but it wasn't easy. Hoping I can at least do that much and do some data logging via VIDA - hopefully the DEM module hasn't failed!

[Vuym]

Hey, just an update if anyone's interested:

Turned out the intercooler hose to the throttle body had a fairly large crack at the joining point after doing a smoke test. My EVAP solenoid had also failed so I managed to replace both. Car is now making 1 bar of boost reliabily and meeting the requested boost pressure which I graphed on VIDA. ECM-261A hasn't come back but I think it takes a while for the car to calculate long-term fuel trim, was hoping the EVAP stuff would solve the fuel odour in front cabin too but no luck there.

AWD system still disabled but code isn't showing up, maybe it just takes some time? I'm starting to think it's more likely the pump, especially in light of some of the replies here. I am getting 0 oil pressure, but reading oil temperature at 27 degrees celsius, no history of it being replaced - I wonder if the poor oil quality eventually burned the pump out. I guess it would be worth doing the pump too if I'm going to be replacing the fluids.

Any advice moving forward? Is the OEM pump part # 30783079? Thanks!

[vtl]

AWD system still disabled but code isn't showing up, maybe it just takes some time? I'm starting to think it's more likely the pump, especially in light of some of the replies here. I am getting 0 oil pressure, but reading oil temperature at 27 degrees celsius, no history of it being replaced - I wonder if the poor oil quality eventually burned the pump out. I guess it would be worth doing the pump too if I'm going to be replacing the fluids.

Any advice moving forward? Is the OEM pump part # 30783079? Thanks!

Haldex pump dies every 10-11 years. You need everything in this kit: https://www.fcpeuro.com/products/volvo- ... ervicekit1 Same kit, but a bit cheaper (BorgWarner acquired Haldex some years ago): https://www.fcpeuro.com/products/volvo- ... 30783079kt

[DavidE7]

"was hoping the EVAP stuff would solve the fuel odour in front cabin too but no luck there."

Check for fuel leaks from the upper o-rings on the fuel injectors. You should be able to see any fuel wetness after removing the small black cover with the two T30 fasteners. Also check for a leak at the fuel tank pump module flange. There are a bunch of articles about that problem.

This is a link to the recall documentation for 2001 to 2004 Volvos with leaky fuel pump modules:
https://static.nhtsa.gov/odi/rcl/2009/R ... 3-0099.pdf

I could smell fuel every time I got out of the car when my 2004 XC70 had a fuel module crack and it reduced the fuel economy.