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[wazzajnr]

power steering control unit


Hi all,

Does anyone know where this unit is? it is marked up as k41 in the Haynes wiring diagrams. I'm assuming it's just a relay but not sure which one. Is there a list of omega relays out there anywhere?
Car is a 1999 2.5 elite model. power steering is very heavy (i.e. minimum assistance.) it is working as the revs change when wheel is turned but i'm measuring no voltage at the connector on the steering box so need to trace back to control unit and check there.
Help please!!!

Paul

[Admin]

Relay list here: http://www.omegaowners.com/forum/YaBB.pl?num=1176560725

However, check the fuse also... http://www.omegaowners.com/forum/YaBB.pl?num=1161602008

Unusual to have PAS problems.

[wazzajnr]

Hiya,

Thanks for relay info but nothing shown there for Power steering? I have now found that i was being daft and had meter set to AC when measuring supply to steering box. There is now 12v there but still minimal assistance. Is it possible to change just the solenoid valve on the steering box or is it a new box needed?
The pump has recently been replaced by the previous owner hoping to solve this issue but it was not the problem.

[Admin]

Hmmm, answer on the solenoid question is... I don't know!  
Never had one fail like that (had a pump die once).

Marks DTM Calib will have the answer, and as he is now back off holiday, should be around later.
He is the man who will know.

[Danny]

this might sound like a silly question or 2, but as many of you will know, my knowledge of cars is minimal, what exactly is power steering fluid for?

does every car with power steering need PS fluid?

does a lack of PS fluid have an effect on it's behaviour?

[Marks DTM Calib]

The relay is behind the glove box, easy to spot as it has servotronic written on it (and ZF I think)

Make sure that F14 is ok first!

Is the steering always heavy or does it get easier when revving the lump...if so, then he power steering pump might be getting tired.

As for the fluid question....its dependent on the technique used.....basicaly there are a few methods.

Hydraulic (as per Omega and the most common)
Electro Hydraulic, similar to the above but uses an electric pump rather than an engine driven unit, becoming much more common (i.e. Astra G on wards etc)
Electric, uses a motor acting directly on the steering column i.e. Corsa C.

Basically the first two require fluid as they are a hydraulic assist system.

[Marks DTM Calib]

As for the fluid level.....if it is very low then yes it could have an affect on the system...

[wazzajnr]

Thanks for advice guys.
Mark, I think relay is ok as i have 12v at the steering box so i suspect the solonoid valve on the box is at fault. The steering is heavy whatever the revs and it had a new steeing pump about 3 months ago to try to solve the prob. Is it possible to replace just the solonoid valve or is it a new box needed? if new box, any idea what it would cost??

Cheers

[TheBoy]

Thanks for advice guys.
Mark, I think relay is ok as i have 12v at the steering box so i suspect the solonoid valve on the box is at fault. The steering is heavy whatever the revs and it had a new steeing pump about 3 months ago to try to solve the prob. Is it possible to replace just the solonoid valve or is it a new box needed? if new box, any idea what it would cost??

Cheers

How heavy is it - is it providing any assistance?

[wazzajnr]

it's very heavy. There is some assistance tho as when you turn the wheel it affects the revs and also if you try to turn wheel with engine off it's nigh on  impossible so it is working. I had a similar problem with one years ago but that was fixed under warranty. turned out to be heated washer jet shorting and blowing F14 but it's not that this time.

[TheBoy]

Has it just gone heavy, or was it always like it?  v6 have the speed sensitive steering, so a few things that can confuse it (ie no speed signal), and it has 3 different settings for the amount of assistance...