The description above points me in the direction of the 30 amp power steering fuse, or the supply to and from it. Check the fuse box in the footwell (passenger side in RHD, not sure about LHD), and the connections to it. It sounds very like voltage drop across a high resistance connection. The power steering dears a very high current, so connections must be clean and bright, and tight.The "Steering Fault" is activating only from time to time and usually just for a moment (I get a "beep" and the fault, but the steering is fine and the fault clears immediately) - it stayed longer only a few times (with the steering assistance gone).
I happens while maneuvering in standstill or almost standstill and while maneuvering on bad road surface - therefore I reckon that in those conditions the steering HPU motor require more power (hence more amps) to operate and maybe some earth connection/supply wire is staring to develop bad contact.
VCDS diagnosis shows no faults regarding the power steering.
Air-con is working just fine (but as it is winter I do not use it very much).
Maybe I need to visit the opticians?Good Afternoon Mac,
Fuse is 80 amp not 30 amp.
Andy
I'll put the opticians off for now, here's where 30amp came from, I'd assumed the (30) meant 30 amps. So eyesight is OK, but thought process, maybe not so much.:Maybe I need to visit the opticians?
Very high current then. Wouldn't need much resistance to drop a few volts.
Mac.
Can you show me the bottom part of this diagram - I hope to see the reference to which earth point is connection T2e/2 connected ...Also check the connection between the fuse, the power steering module (J500), and from the power steering module to the power steering pump
itself, as these all carry the high current supply.
Mac.
View attachment 102789
Have checked fluid level in the reservoir below the NS headlight . All seems ok. I do need to check connections for corrosion and confirm Earth is OK too.Too little or too much fluid in the pump will also have and effect as would the wrong fluid. The wiring connections on the pump can corrode so that would be an area to check really carefully.
About the earth point - are you referring to the one that starter motor is connected to?The pump motor itself could be failing. The power steering pump is by far the largest consumer of power and will have problems from the simplest thing to the most complicated. All connectors need to be corrosion free and tight. The battery and all the connections to it including the auxiliary positive box must also have clean contacts and be tight. The fluid level must be correct in the pump and its connector clean and tight. The main earth lead from the starter to the chassis under the left headlight must be perfect- can be clean and tight at either end yet corroded or broken under the insulation. The alternator and charging system must be working correctly. The fuse must be good, clean and no signs of burning......
Yes I need to check the earth from starter to under headlight, then alternator ... then take it from there ...The pump motor itself could be failing. The power steering pump is by far the largest consumer of power and will have problems from the simplest thing to the most complicated. All connectors need to be corrosion free and tight. The battery and all the connections to it including the auxiliary positive box must also have clean contacts and be tight. The fluid level must be correct in the pump and its connector clean and tight. The main earth lead from the starter to the chassis under the left headlight must be perfect- can be clean and tight at either end yet corroded or broken under the insulation. The alternator and charging system must be working correctly. The fuse must be good, clean and no signs of burning......