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Old 07-05-2019   #1
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Power Steering Saga Part Deux

Ok I'm tearing my hair out here.

Purchased a refurbed steering unit which I was told didn't need a code.

Mechanically it's fine, works perfectly, city mode included.

BUT... It's throwing a U001 Can signal error.

I purchased a multimeter and checked out the earths at the weekend as per the elearn diagnostic.

Measured battery voltage, then voltage across the connector to the unit.

Static load I had a 0.2V drop. Dynamic load there was no drop in voltage.

So I'm assuming the earth's are all ok.

Where the hell do I go from here though? Got my MOT in a month and it's going to fail even though there's nothing wrong with it.
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Old 07-05-2019   #2
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Re: Power Steering Saga Part Deux

Ask the people who you bought the refurbised item from for help..error code wasnt there before ...was it?....Im making an assumption that you cleared the code...

The unit DID have matching numbers to your original one...didnt it?
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Last edited by nikrox; 07-05-2019 at 14:39.
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Old 07-05-2019   #3
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Re: Power Steering Saga Part Deux

Quote Originally Posted by nikrox View Post
Ask the people who you bought the refurbised item from for help..error code wasnt there before ...was it?....
I didn't check for a code before removing the old one. It mechanically sounded awful then failed so it was obviously buggered

Quote Originally Posted by nikrox View Post
Im making an assumption that you cleared the code...
I did after installing the new unit and it came straight back

Quote Originally Posted by nikrox View Post
The unit DID have matching numbers to your original one...didnt it?
Indeed it did.

They sent me a second unit to try so they're now saying the fault is at my end. Damned if I can work it out though.
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Old 07-05-2019   #4
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Re: Power Steering Saga Part Deux

Did you do the proxy alignment to the new PSU?
If not then it makes sense it won't communicate on the can network.

You'd nee access to a oscilloscope to test the car's CAN network... you only need to see if data is transmitted on those wires with the PSU connected and disconnected.
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Old 08-05-2019   #5
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Re: Power Steering Saga Part Deux

When I fitted 'my' unit it plug and play..It had the same identity/serial numbers on it as the original.

Maybe I got lucky.
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Old 09-05-2019   #6
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Re: Power Steering Saga Part Deux

Bernie,

Could you lay your hands on a wiring diagram for the Can connector please?

Cheers.

My next plan of attack is to check the resistance on the CAN signal wires with the unit attached and unattached.

If that's ok I don't have an oscilloscope but I have got a full version of multiecuscan.

I'll hook it up and see what data I can graph from the module.

If anyone's familiar with the software and can offer any hints I'd appreciate it.

Failing that it's going to be a trip an auto electrician.

Thanks,

Thomas
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Old 10-05-2019   #7
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Re: Power Steering Saga Part Deux

Hi Thomas,

sorry that's all I can find ...

BRs, Bernie
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Old 13-05-2019   #8
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Re: Power Steering Saga Part Deux

Morning All,

Found a pinout for the can plug for the steering module and checked the power to that as well. All good.


Hooked up the laptop and got the error code, stayed after clearing.


Done proxi alignment and position calibration ok.


Tried to do torque calibration and it came up with an out of range error. Any ideas on this one?


Few screenshots below in case they are of use.
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Old 13-05-2019   #9
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Re: Power Steering Saga Part Deux

The PSU module is probably OK..since it communicates and you can see it/connect to it with MES.
The column sensor might be bad. So that might be the reason why it's saying out of range. Trying to send sensor position to the can network...
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Old 13-05-2019   #10
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Re: Power Steering Saga Part Deux

Quote Originally Posted by aurick86 View Post
The column sensor might be bad. So that might be the reason why it's saying out of range. Trying to send sensor position to the can network...

Thanks Aurick, much appreciated.


Is the column sensor part of the power steering unit itself?


Thanks,

Thomas
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Old 13-05-2019   #11
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Re: Power Steering Saga Part Deux

I think that steering column sensor is not present (as MES says) because you have vehicle with ABS. Are you sure that you choosed right car/model in MES? Becuase if you choose similar model (like EVO instead of Grande) , not all parts of diag are working properly. That's my experience... For example first I choosed Grande, and I was not able to reset ECU's learned parameters. After that I choosed Punto 1.4 8v 2012+ or something like that and reset was working OK...little chance...but still some chance...maybe you can make Proxi Allignment procedure again with different car model...
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Last edited by Rado77; 13-05-2019 at 12:35.
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Old 13-05-2019   #12
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Re: Power Steering Saga Part Deux

I'll double check but I'm pretty sure I had the right model. Thanks for the tip.
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Old 13-05-2019   #13
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Re: Power Steering Saga Part Deux

Ok found a guide to the column sensor. (Attached PDF)

Couple of things spring to mind. The column sensor on the reconditioned one has the cable inside. (My old unit had the plug on the outside like the one on the PDF) Wondering if it's possible when they reconditioned it, they installed the wrong item.

Looking at the end of this document does the wheel have to be at -144 degrees/ 0 torque when you perform the position calibration?

If so I can potentially try that in the software again tonight.

Thanks,

Thomas
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Old 14-05-2019   #14
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Re: Power Steering Saga Part Deux

I've found that the CAN signal plug into the power steering module is a bit past it.

It's missing the red tab and is a bit wobbly. It's gotten worse in the last day or so and has started throwing an ABS light as well now.

Spoke to the parts department who said they couldn't supply a new connector!

After a lot of trawling I found this Delphi connector. Minimum order of 10, 12.95 delivered!


QUESTION: For those more experienced with auto electrics than me, how sensitive are the CAN connectors to loose/wobbly connectors. I'm going to order a pack of these and see if it helps the problem out.

Thanks,

Thomas
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Old 14-05-2019   #15
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Re: Power Steering Saga Part Deux

I would suggest that a plug that provides intermitent signals,due to it being 'wobbly' is a very real pita.
If your competent at soldering go get one off a car in the breakers and see how that works out..
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