[928uk] Differential control off warning

[Paul R Smith]

If, for example, the pump is bunged up with sludge, and if every time 
you turn the ignition on it tries to run the pump for a minute before 
realising that it hasn't built up pressure and turning the pump off. 
Then it could be beneficial to disconnect the power until you fix it. As 
it's not fused, I think you would need to unplug the pump relay, which, 
unfortunately, is mounted on the pump unit behind the left rear wheel. 
You could disconnect it at the battery if you could work out which wire 
it is.

On the other hand it might not try to run the pump once it registers the 
fault.

Either way, it's not dangerous to drive.

Smiffy

On 06/02/2023 15:39, Richard Armstrong via 928uk wrote:
> You can drive it just fine. You won't have any limited slip diff but 
> just drive a little slower!😁
> Regards
> richard
>
> On 06/02/2023 15:36, Jan-Willem Labeij wrote:
>> Thanks Richard,
>> That was quick!
>> Can I drive it or does it need fixing asap…
>>
>> Sent from my iPad
>>
>>> On 6 Feb 2023, at 15:28, Richard Armstrong 
>>> <richard at ritech-systems.com> wrote:
>>>
>>>  Hi Jan-Willem
>>> That means your PSD pump is not working - not keeping the system at 
>>> pressure so it shuts itself down.
>>> It could be the brake fluid level is low (but that would be because 
>>> of a leak anyway) or, more likely, the pump has stopped pressurising 
>>> the fluid. It is a spring and ball bearing rotating in an eccentric 
>>> case and when the fluid gets old and gets some moistue in there it 
>>> gets crystaline and jams the pump.
>>> It could also be the accumulator leaking - it is very high pressure 
>>> and not to be messed with if you don't know what you are doing!
>>> Richard
>>>
>>> On 06/02/2023 15:05, Jan-Willem Labeij wrote:
>>>> A red differential control off warning is showing after start up.
>>>> 1990 S4, what does it mean?
>>>> Cheers,
>>>> Jan-Willem
>>>>
>>>> Sent from my iPad
>>>
>>> -- 
>>> <Email%20Signature%202018.jpg>
>