Neil Haughey
New member
After reading all the replies and having been through all sorts of ABS issues myself I reckon its the pump. Had pump problems of my own as they can get sticky but thus far has always eased up again.
ABS Problem, Searched And Found Nothing!
- Thread starter 944Fripp
- Start date
Thanks for the optimistic reply.
The car has been at a Porsche specialist today and has gone through a full visual and diagnostic check, and guess what no fault found. So come on you clever guys what do I do now... ( take the bulbs out ?)
Any help would be appreciated
Kind regards
The car has been at a Porsche specialist today and has gone through a full visual and diagnostic check, and guess what no fault found. So come on you clever guys what do I do now... ( take the bulbs out ?)
Any help would be appreciated
Kind regards
Thanks Colin, I am getting to the end of my tether with this annoying warning light coming on after a very short run, (100 yards or so) . Following the forum people seem to suggest that if the warning light only comes on when moving , that the pump is working ? But if a change of pump is the answer I would go for it. I have no idea as to the cost, but would be great full if you could advice.
Kind regards
Keith
Kind regards
Keith
eddieedmo
New member
Keith , iust to recap your ABS light comes on just after you set off at approx 8mph ?.Is the pump self testing and priming when you set off ,you should hear a feint whirring noise ?.
Is the ABS ACTUALLY WORKING ? have you tested it to see on a loose surface at speed ?
How did the specialists check the system ? - wiring,connectors,sensors etc. for connectivity and earthing ?
I have spare sensors and a Bosch tested ECU if you want to borrow to try.
It is very frustrating I went through it last year , keep going and you will sort it.
Nick [
]
Is the ABS ACTUALLY WORKING ? have you tested it to see on a loose surface at speed ?
How did the specialists check the system ? - wiring,connectors,sensors etc. for connectivity and earthing ?
I have spare sensors and a Bosch tested ECU if you want to borrow to try.
It is very frustrating I went through it last year , keep going and you will sort it.
Nick [
]
So I did say I would keep you all upto date with the abs warning light and the full diagnostic at the main Porsche dealer in Kendal. Well after 2 hours of testing and checking NO FAULT FOUND.
More help needed together I am confident you guys out there will hold the answer to my abs problem. PLEASE
More help needed together I am confident you guys out there will hold the answer to my abs problem. PLEASE
Hi Keith. From the numerous problems I have had with mine, this is what I can gather....basically the ECU is a lazy bu99er and looking for just about any reason to turn the system off and have an easy life!
The system start up seems to be that on ignition the ECU passes a current around the entire system to check everything is connected. Correct me if I'm wrong anyone but if the pump is seized it won't show at this point however if the pump or sensors have a bad earth, it will (this was the case with mine....that I started this thread off with). If the ECU isn't working it will flag up the problem and turn on the warning light. If the sensors are connected correctly the light won't come on. So I'd say your pump is earthed OK, your sensors are connected OK and the ECU us functioning just fine.
It all changes however when the car starts to move. As soon as the wheels turn the ECU receives signals from the sensors and if even one isn't working the system will cut out and show the ABS warning light. This happens immediately as you set off, not after a number of seconds or a couple of meters but immediately as the wheels turn. I know this as like many others I've had a sensor go too and experienced this. Try driving at a speed less than 10mph and see if the light comes on. If it doesn't your ECU is fine and your sensors are fine.
At 10mph the ECU primes the pump. You can hear the pump priming if you don't breath and are on a good road surface (best of luck with that!!)!!! If the pump doesn't prime the system disables itself and flags up the problem. From what you describe, I think this is the problem. The fault won't clear until the engine is switched off and the sequence is restarted so this small couple of seconds ends up affecting the rest of the journey. Told you.....lazy bu99er!!
I don't know enough about ECU diagnostics to know if this would show as a fault but perhaps the diagnosis is only looking at passing the current around the circuit check and hence would not pick up a seized pump. Maybe you were unlucky that the one time it works was when the diagnostic was done (always happens to me....take the car in and it works, go and pick it up and it starts throwing its toys out the pram again!!).
I'm not a betting man but I'd stake my last monopoly winnings on it being the pump in dire need of replacement! And I owned 6 hotels, Mayfair and Park Lane!!! []
This is all open to speculation by folks here that know far more than me but it all seems logical to my mind and there may be something there that helps! I also realise it is a very simplistic view but then again, the system is a relatively simple system...even if I do know nothing about automotive electronics!
Hope the above is of help, been at the end of the tether many, many, many times over the last 5years of owning mine but I promise the feeling of driving along with no warning lights....for even just a few miles is really worth it!
Very best of luck to you and I really hope you get it sorted.
The system start up seems to be that on ignition the ECU passes a current around the entire system to check everything is connected. Correct me if I'm wrong anyone but if the pump is seized it won't show at this point however if the pump or sensors have a bad earth, it will (this was the case with mine....that I started this thread off with). If the ECU isn't working it will flag up the problem and turn on the warning light. If the sensors are connected correctly the light won't come on. So I'd say your pump is earthed OK, your sensors are connected OK and the ECU us functioning just fine.
It all changes however when the car starts to move. As soon as the wheels turn the ECU receives signals from the sensors and if even one isn't working the system will cut out and show the ABS warning light. This happens immediately as you set off, not after a number of seconds or a couple of meters but immediately as the wheels turn. I know this as like many others I've had a sensor go too and experienced this. Try driving at a speed less than 10mph and see if the light comes on. If it doesn't your ECU is fine and your sensors are fine.
At 10mph the ECU primes the pump. You can hear the pump priming if you don't breath and are on a good road surface (best of luck with that!!)!!! If the pump doesn't prime the system disables itself and flags up the problem. From what you describe, I think this is the problem. The fault won't clear until the engine is switched off and the sequence is restarted so this small couple of seconds ends up affecting the rest of the journey. Told you.....lazy bu99er!!
I don't know enough about ECU diagnostics to know if this would show as a fault but perhaps the diagnosis is only looking at passing the current around the circuit check and hence would not pick up a seized pump. Maybe you were unlucky that the one time it works was when the diagnostic was done (always happens to me....take the car in and it works, go and pick it up and it starts throwing its toys out the pram again!!).
I'm not a betting man but I'd stake my last monopoly winnings on it being the pump in dire need of replacement! And I owned 6 hotels, Mayfair and Park Lane!!! [
]This is all open to speculation by folks here that know far more than me but it all seems logical to my mind and there may be something there that helps! I also realise it is a very simplistic view but then again, the system is a relatively simple system...even if I do know nothing about automotive electronics!
Hope the above is of help, been at the end of the tether many, many, many times over the last 5years of owning mine but I promise the feeling of driving along with no warning lights....for even just a few miles is really worth it!
Very best of luck to you and I really hope you get it sorted.
Thank you Tom for your excellent and much enjoyed whit, just as you predicted at 3 to 8 mph no warning light, touch the heady speed of 10 mph and on comes the light.
So new or otherwise the search is on for a change of abs pump any one out there with suggestions as to a supplier would be greatfull , to fit a 1991 S2 cab 944 (cobalt blue).
Many thanks again for the time and trouble you have taken to explain and diagnose our problem, lets keep the old girls on the road !
Kind regards
Keith.
Ps 1991 s2 for sale if all fails hehe
So new or otherwise the search is on for a change of abs pump any one out there with suggestions as to a supplier would be greatfull , to fit a 1991 S2 cab 944 (cobalt blue).
Many thanks again for the time and trouble you have taken to explain and diagnose our problem, lets keep the old girls on the road !
Kind regards
Keith.
Ps 1991 s2 for sale if all fails hehe
Thanks for the contact Elliot is a star he sent the ECU and a pump, so I had a go at the ECU change but no change with the warning light coming on. So booked in for the abs pump to be replaced, £220 later replacement pump fitted and you guessed still the abs warning light comes on. Tether now snapped ... What else can we change?
Any help for the next step (take the bulb out )
Kind regards
And a big please any help greatfully received
Keith
Any help for the next step (take the bulb out )
Kind regards
And a big please any help greatfully received
Keith
Posts made and opinions expressed are those of the individual forum members
Use of the Forum is subject to the Terms and Conditions
