V70 fault code power supply pump motor
 

2005 facelift V70 D5

The abs light is on and the code reader says 'power supply pump motor'

The mechanic suggests the abs pump might need to be replaced

The relevant fuse was missing and when replaced the light went out briefly but returned within a few hundred metres. Very occasionally the light still goes out but comes on again

I have seen abs pumps are available on ebay but it seems they would need coding. Is that correct? I don't think my local mechanic could do that and i don't want to try a main dealer

My question is is it most likely to be the pump / module? Can one be replaced without the other? Would it definitely need a recode?

Is there anything around the pump which might cause this? Like a faulty connection?

https://volvodiagnostic.com/ is about an hour round the m25 and up the A13 to Tilbury, so not too far away

they can do programming, if it is necessary

I would drop them an email first and just ask what they think about the fault and if a new/replacement 2nd hand one would be likely to cure it

contact@volvodiagnostic.com

someone else might come along and suggest other things to try like which pins to test for voltage or whatever

its probably the pump itself , just swap over from another unit to prove a point ..

So if the pump and module come as one (which they seem to on ebay) split them and just install the pump?

Hi. Strange that the fuse was out . Possibly someone was trying to hide the fault.
Anyhow , sounds like a poor electrical connection. May be pump internals as they do go bad.
Best thing is to remove the elecronics module from the square block ( usual power down op first ) . This is the only part coded to the car so no worries.
Remove the pump motor from the square block carefully trying not to dislodge the eccentric disc that the pump shaft passes through . This disc sits between ball/spring operated pistons in the square block. If you do dislodge the disc it can be fiddly to get back in .
Un-plug the main harness. The pump power pins pass through the square block on a long connector . Usually , it is tarnish / corrosion causing a bad connection . You can put 12v across the pump to make sure it runs OK before refitting.
No hydraulics , brake fluid or bleeding involved.

yes exactly , but the problem is likely to be where the pump lead wires are soldered to the main board in the electronic part of the ABS unit . the heat causes the soldered joint to crack with the constant heating and cooling ,over decades , this goes right back to the 850 models , not on all by any means but the heavily used ones . there are companies which can repair this for you .

And in this case either replace the electronic part (the module?) for one without damage (which would require programming?) Or get my one fixed (which could go back on without programming?)

At the minute it sounds like VOLVOBOY is saying the fault could be the connection for the pump itself and Clan is saying it could be the connection to the module

Is that right? Possibly two seperate areas? Does each part have its own power supply?

Yes re soldering under the cover is not too bad a job .

No.
What i am saying is to pull everything apart and check it as you go. To cut open the electronics module would be the last thing that you`d want but if you don`t find the fault then Clan is right , it must be at the board end.
It`s the same electrical supply. It will all become clear as you take it apart. If you get a second hand unit complete before as Clan suggested do a dummy run on that first.