[928uk] PSD

[S C]

That would also explain why the ABS isn't grumbling.

I've heard it's possible to clean them but if I remember it looks like a sealed unit. Any idea? The price new is unbelievably horrendous but it's shared with the 964 C4, so hopefully second user ones appear online.

On 16 Feb 2012, at 23:10, Paul R Smith <smiffypr at clear.net.nz> wrote:

> Made me wonder if it could be the lateral G sensor as that is ignored at low speed.
> 
> Smiffy
> 
> On 17/02/2012 11:20 a.m., Simon Crowe wrote:
>> 
>> Hi Alex
>> 
>> I agree, the hydraulic side of the PSD system needs to be considered, and in my experience of the system on the two cars I have owned both have been hydraulic related issues rather than electrical. A good indicator is that an ECU with no error messages but a PSD system that is disabling itself does point to a hydraulic related issue, rather than the electronics around it.
>> 
>> In Chris's case the pump has been rebuild by Paul and the system will have been bled, plus the symptoms seems to occur at a particular speed, it would seem more likely to be electrically based rather than hydraulic. 
>> 
>> I hadn't thought about the slave leaking into the transaxle, that's a scary thought given how rare the manual transaxles are becoming, The slaves are a bit exposed too, although I haven't had one fail yet, just as well given the current OPC price for a replacement.
>> 
>> Cheers,
>> Simon.
>> 
>> From: Alexander Popov <alexander_e_popov at yahoo.co.uk>
>> Date: Thu, 16 Feb 2012 15:50:43 +0000
>> Cc: 928uk List submission <928uk at lists.928.org.uk>
>> Subject: Re: [928uk] PSD
>> 
>> It is worth pointing out that the PSD light would illuminate even when the actual system is not functioning. 
>> 
>> You can get error messages for many reasons. To name but a few:
>> 
>> - faulty pump cannot build enough pressure in the accumulator
>> - air lock in the system fooling the solenoid valve 
>> - faulty solenoid valve
>> - faulty pressure switch 
>> - slave cylinder leaking into transaxle. not enough fluid, pump cannot built pressure. this should be part of the annual inspection. at the age our cars are, the seals are beginning to get very brittle. left for too long, it will destroy the gearbox. 
>> - faulty ABS brain
>> - faulty ABS sensor 
>> - faulty PSD relay in spare wheel well
>> 
>> Some of these can be diagnosed with the help of a Spanner or Hammer, but for others you would need your eyes and hands. 
>> 
>> Hope this helps,
>> 
>> Alex
>> 
>> Sent from my iPhone
>> 
>> On 16 Feb 2012, at 09:49, "Chris Madden" <madds at compuserve.com> wrote:
>> 
>>> Hello All
>>> 
>>>  
>>> 
>>> When I bought my car I was aware that the PSD was not working as the dash told me whenever I started the car, I’ve since had the pump overhauled by Dr A which seemed to fix it and I now see the PSD light active from time to time.
>>> 
>>>  
>>> 
>>> But I then found that occasionally when cruising at Motorway speeds in a straight line and with apparent loss of traction, the PSD light would appear and then possibly be disengaged. I mentioned this to Dr A on my next visit and he changed the ecu but it still switches itself off and it seems to happen at speeds around 60mph. (this may be coincidence), but I’ve never seen it happen at low speeds.
>>> 
>>>  
>>> 
>>> Dr A has advised some self-diagnosis to try and keep on top of costs and so I wondered if anyone else has experienced anything similar?
>>> 
>>>  
>>> 
>>> Many thanks
>>> 
>>>  
>>> 
>>> Chris Madden
>>> 
>>> Guards Red 1990 GT
>>> 
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