[928uk] PSD

[Paul R Smith]

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 
> <mailto: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 
> <mailto: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 
> <mailto: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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