Steering pressure pump

[Pie-eyedpiper]

I've previously swapped my steering wheel for a TT one, that was back last Summer and all was good after. Doubtful thats caused anything.
So yes, I can take it off again.
My wife took it to be tracked, prior to having it MOTd thinking the tracking being way out was causing the issue.
The track was way off, and they have sorted it as best they can (I can post before and after diagrams). But it hasn't sorted the issue, and they didn't even straighten the wheel before aligning.
And that is at a dedicated tyre fitting company.

 

[PlasticMac]

If you remove the airbag, you can check if the steering wheel is fitted correctly, as the wheel centre and the splined shaft are marked, and if they are inline, the steering wheel is fine. Unless it's been off previously, it will be spot on .
Mac.

 

[PlasticMac]

I've previously swapped my steering wheel for a TT one, that was back last Summer and all was good after. Doubtful thats caused anything.
So yes, I can take it off again.
My wife took it to be tracked, prior to having it MOTd thinking the tracking being way out was causing the issue.
The track was way off, and they have sorted it as best they can (I can post before and after diagrams). But it hasn't sorted the issue, and they didn't even straighten the wheel before aligning.
And that is at a dedicated tyre fitting company.

Did you line up the scribe marks, when you fitted the TT wheel?
Can you jack the front up, so both front wheels are off the ground, then see how the steering feels. Should be light and easy, even with engine off, and no PS assistance.
Mac.

 

[PlasticMac]

I second what PlasticMac said about finding a tracking workshop.


How confidant are you taking the steering wheel off? I can talk you through it with photos if that would be helpful?

Edit

If you fancy some background design and function info about the A2 power steering seek out the following pages 20 through 29 in this publication.

 

[Pie-eyedpiper]

If you remove the airbag, you can check if the steering wheel is fitted correctly, as the wheel centre and the splined shaft are marked, and if they are inline, the steering wheel is fine. Unless it's been off previously, it will be spot on .
Mac.

I didn't know about the scribed marks, just lined the wheels up straight and fitted the wheel straight, as the old one was.

 

[PlasticMac]

I didn't know about the scribed marks, just lined the wheels up straight and fitted the wheel straight, as the old one was.

Might be worth a look then. You can't see the shaft mark without removing the sleeve nut though. The spline is very fine, allowing very precise alignment.
Unless it spot on, the steering angle sensor will be out too.
Look at Group 04, Block 01 in ABS, Should read zero +/- 4.5 minutes, with wheel dead ahead. so with wheel dead ahead, at 12 o'clock, should read zero, (+/- 4.5 mins). if it doesn't read zero, the figure shown is how far out it is. Easier than removing the wheel to find out.
Mac.

 

[Pie-eyedpiper]

Might be worth a look then. You can't see the shaft mark without removing the sleeve nut though. The spline is very fine, allowing very precise alignment.
Unless it spot on, the steering angle sensor will be out too.
Look at Group 04, Block 01 in ABS, Should read zero +/- 4.5 minutes, with wheel dead ahead. so with wheel dead ahead, at 12 o'clock, should read zero, (+/- 4.5 mins). if it doesn't read zero, the figure shown is how far out it is. Easier than removing the wheel to find out.
Mac.

Group 04, Block 01 in VCDS?

 

[Pie-eyedpiper]

I second what PlasticMac said about finding a tracking workshop.


How confidant are you taking the steering wheel off? I can talk you through it with photos if that would be helpful?

Edit

If you fancy some background design and function info about the A2 power steering seek out the following pages 20 through 29 in this publication.

Thanks for that.
Blimey, it's quite a complicated system, seems there could be many causes of heavy steering.

 

[PlasticMac]

Group 04, Block 01 in VCDS?

Yes, ABS Controller, Group 004, Block 01.
Mac.

 

[Deleted member 20348]

Thanks for that.
Blimey, it's quite a complicated system, seems there could be many causes of heavy steering.

The steering design team did a fantastic job.
Electro, mechanical, hydraulic, speed sensing, skid detecting, accelerometer controled harmony.

I probably missed something from the list.

What was wrong with a rack and pinion?

 

[Pie-eyedpiper]

Did you line up the scribe marks, when you fitted the TT wheel?
Can you jack the front up, so both front wheels are off the ground, then see how the steering feels. Should be light and easy, even with engine off, and no PS assistance.
Mac.

Car jacked, both front wheels off the ground. Steering is nice and light.
Is this indicating something wrong with the steering angle sensor position rather than the rack and system itself?

 

[PlasticMac]

Car jacked, both front wheels off the ground. Steering is nice and light.
Is this indicating something wrong with the steering angle sensor position rather than the rack and system itself?

I wouldn't worry about the steering angle sensor for now.
I'd say the primary problem is that power steering pump not running on full power.
Could be the pump/controller, or supply to the motor, which is very high current, so intolerant of any less than perfect connections.
Could be a sensor somewhere flagging a problem that triggers reduced steering assistance, as a safety precaution. But that would, I think, bring up a dash warning, which hasn't been mentioned.
So it's the pump, pump controller or supply. I'd want to rule the supply out first. The no comms to the PS Controller hints at supply side.
Mac.

 

[PlasticMac]

Car jacked, both front wheels off the ground. Steering is nice and light.
Is this indicating something wrong with the steering angle sensor position rather than the rack and system itself?

If you have axle stands, for each front wheel, you could run the engine, and see what the PS does, with no load, abs, maybe check voltage?
But, only if the car is safe on axle stands.
Mac

 

[Pie-eyedpiper]

I wouldn't worry about the steering angle sensor for now.
I'd say the primary problem is that power steering pump not running on full power.
Could be the pump/controller, or supply to the motor, which is very high current, so intolerant of any less than perfect connections.
Could be a sensor somewhere flagging a problem that triggers reduced steering assistance, as a safety precaution. But that would, I think, bring up a dash warning, which hasn't been mentioned.
So it's the pump, pump controller or supply. I'd want to rule the supply out first. The no comms to the PS Controller hints at supply side.
Mac.

I seem to have hijacked this thread, you gave got my problem mixed up with the OP @ NI Jim
I havn't got a "no Comms" issue. I fact I haven't got any related fault codes come up at all.

You mentioned putting my headlights on before.
Us that testing the alternator out?

 

[PlasticMac]

I seem to have hijacked this thread, you gave got my problem mixed up with the OP @ NI Jim
I having got a "no Comms" issue. I fact I haven't got any related fault codes come up at all.

You mentioned putting my headlights on before.
Us that testing the alternator out?

You are correct, @Pie-eyedpiper I have confused you with @NI Jim

Edit: To check out your steering angle sensor, use:
ABS Controller, Group 004, Steering Angle / Lateral Acceleration / Rotation Rate
Block 01,Steering Angle,Sensor (G85),Specification: ± 4.5 °
Block 02,Lateral Acc.,Sensor (G200),Specification: ± 0.5 m/s²
Block 03,Rotation Rate,,Specification: ± 2.5 °/s

Block 01 should be zero, +/- 4.5 ° Any out of tolerance error here is the angle your steering wheel is out compared to the steering angle sensor. If it is actually out, it's wheel off and refit to scribe marks. If no scribe marks, set column so that Block 01 reads zero, then refit wheel at 12 o'clock.
You will then need to get the tracking reset, to get the straight ahead when driving, at 12 O'clock though.
Mac.

 

[Deleted member 20348]

Easily done.

Hi there everyone. I’ve just joined today and am brand new to this. I have a 2002 1.4 SE that I have owned from new and have a big problem with the steering pressure pump. Mechanic told me it was faulty. I bought second hand one that was meant to be the same. The fault light goes out but it won’t communicate with the car. The part is 8Z0423156R. Any hints or know anywhere I could get it repaired

Hello,
Hope you're well.
whilst searching old forum posts this one popped up. I thought it maybe of some use. It's 5 pages long but the solution to their steering problem is fixed on page one.
I did check this post to see if this has been suggested by someone. Apologies if I've repeated you.
This link talks of how the wire loom can rub on the NS front suspension tower and suggests that the loom is checked here for chafing. If it looks as if there's ware to your loom but it's not gone through, I'd wrap some extra cloth tape in that area.
EDIT
TESA cloth tape is fantastic for OEM looking loom repairs. Treat yourself if you don't already own some!

All the best

EDIT

 

[NI Jim]

Hi guys. I’ve not posted for a while but I’ve checked everything on here and all is ok. Even sent the original pump to ECU testing but they returned it saying they couldn’t test it due to the software level. I’m totally baffled! So I’ve ordered a fully reconditioned one from Western Power Steering which they tell me is plug and play. So fingers crossed. I’ll update after I get it. Thanks again.

 

[NI Jim]

Ok guys. Here’s an update and if anyone has any thoughts I would really appreciate them. Reconditioned steering pump fitted and its firing up and buzzing away. The fault has also cleared but steering not fixed. The fault is now showing as a steering angle sensor. Problem is I can’t currently drive the car as the clutch is gone and I was hoping to clear the steering problem first before spending more money. Ran steering angle sensor adaptation but the programme stopped before finishing. Thinking that maybe the car needs to be driven for the sensor to calibrate. Any thoughts? Thanks Jim

 

[PlasticMac]

Yes, the adaptation requires the car to be reversed a few metres then forwards the same. Engine running in neutral, steering wheel dead ahead, level ground, and an assistant to push you should do it.
Mac.