Our 2009 Multispace has just failed its test because of the above message appearing on the centre display screen for up to twenty seconds after starting the engine. The message then goes out and does not re-appear until after the engine is re-started again.
The amber ABS icon on the small dashboard display screen goes off and stays off as normal once the engine has started.
We purchased the car with the known fault as it had not been an issue at its latest test and it has passed two further annual inspections since.
We are glad now that it has been picked up by the examiner and the time has come to get it sorted.
It has been suggested that it may be a pump or relay fault so I have checked expected voltages at the ABS duel relay 15 pin connector and they seem fine.
I have fitted a brand new relay and the fault has not gone away.
I have a basic OBD11 scanner and the results from that do not indicate any fault codes. I have used the scanners fault code resetting facility to eliminate the possibility of fault codes stored from when the original relay was still in place.
The next logical step on this journey points towards the ABS pump module unless you guys with far more experience than I may be able to suggest other possibilities.
(15-08-2024, 05:24 PM)Kazik Wrote: Our 2009 Multispace has just failed its test because of the above message appearing on the centre display screen for up to twenty seconds after starting the engine. The message then goes out and does not re-appear until after the engine is re-started again.
The amber ABS icon on the small dashboard display screen goes off and stays off as normal once the engine has started.
We purchased the car with the known fault as it had not been an issue at its latest test and it has passed two further annual inspections since.
We are glad now that it has been picked up by the examiner and the time has come to get it sorted.
It has been suggested that it may be a pump or relay fault so I have checked expected voltages at the ABS duel relay 15 pin connector and they seem fine.
I have fitted a brand new relay and the fault has not gone away.
I have a basic OBD11 scanner and the results from that do not indicate any fault codes. I have used the scanners fault code resetting facility to eliminate the possibility of fault codes stored from when the original relay was still in place.
The next logical step on this journey points towards the ABS pump module unless you guys with far more experience than I may be able to suggest other possibilities.
Thank you in advance of your comments.
AS @shtu has stated the ABS fault waring can be caused by a number of things [not all to do with ABS!!] Without getting a proper fault code read you really are in the dark. It might be worth paying for a proper fault read out, or if you plan to keep the vehicle a lot longer a diagnostic reader that will work on PSA group vehicles.
Sometimes it can be as simple as a wheel sensor, or even a wheel sensor being lifted away from hub by rust build up under the sensor [bit of a design fault on these as only one screw holding a plastic body sensor in place, rust builds up under the sensor and lifts it out of position] but it could be any one of the four.
Also some members have reported broken wires to the sensors, especially across the back axle.
In my case it was liquid damage in the engine bay fuse box causing shorting out of the electronics in that box and causing ABS [and other] warnings.
So it it comes back to the fact you need a proper fault code read to get a starting point, otherwise just changing components can become very costly, very quickly.
At its first test since we acquired the vehicle, the test centre OBD readings indicated a right front sensor fault as an advisory. We replaced that sensor and expected the "ABS System faulty" message to go away. but it never did, so there is something else faulty.
The message appears within seconds of starting the engine and with the car still parked and with the handbrake on. My logic tells me that sensing of wheel rotation is not relevant, although of course, sensor wiring continuity could be.
As suggested, I have more diagnostic work to do.
A trip to the local mechanic and his scanner has to be next but it is Friday afternoon so what chance of catching him at his garage and available to do the scan?
(16-08-2024, 01:37 PM)Kazik Wrote: At its first test since we acquired the vehicle, the test centre OBD readings indicated a right front sensor fault as an advisory. We replaced that sensor and expected the "ABS System faulty" message to go away. but it never did, so there is something else faulty.
Read. My. ABS. Relay. Thread.
I had to actively clear the fault codes stored in the ABS system, they didn't just go away. It may be the same thing with your wheel sensor replacement.
Proper diagnostic tool capable of reading and clearing the ABS faults = essential.
Frankly, I've had so much use out of my hooky chinese Diagbox it's paid for itself several times over.
(16-08-2024, 01:37 PM)Kazik Wrote: Thank you shtu and Multispacer for your comments.
At its first test since we acquired the vehicle, the test centre OBD readings indicated a right front sensor fault as an advisory. We replaced that sensor and expected the "ABS System faulty" message to go away. but it never did, so there is something else faulty.
The message appears within seconds of starting the engine and with the car still parked and with the handbrake on. My logic tells me that sensing of wheel rotation is not relevant, although of course, sensor wiring continuity could be.
As suggested, I have more diagnostic work to do.
A trip to the local mechanic and his scanner has to be next but it is Friday afternoon so what chance of catching him at his garage and available to do the scan?
When you replaced the sensor, did you properly cleanout the recess the sensor sits in? I'm asking as this is quite a common fault rust builds up in the recess, 'lifts' the sensor just far enough to not be able to sense wheel rotation and then you get a fault message. It normally needs a good scrape out [with a small flat bladed screwdriver or suchlike] before the new sensor is fitted otherwise the error will not go even after fitting a new sensor.
Update. So I managed to catch the mechanic at his workshop, between jobs and he was very helpful.
Apart from imparting some of his experience and advice he did carry out a diagnostics scan. Very quickly his device indicated a right front sensor problem and a short test drive proved zero output from that sensor. Having suitably shown my gratitude I left his premises, confident of my next move. Arrived at home and set about accessing the front right sensor connector under the wheel arch. Jacking vehicles up on a loose rock surfaced drive is no fun but with appropriate additional support in place I was able to check for continuity of sensor and that was ok Continuity of harness back to ABS module is missing so there is a break somewhere along that line. Impending rain stopped further work and I packed up for the day.
Saturday morning and I do not want to get wet so decided to come back indoors and check out the original dual relay that I had replaced with a new unit. Bench testing with a meter has indicated the diode feeding one of the two relay coils is open circuit. This has been confirmed by supplying power to the connection pins (7 and 14) and noting the total absence of any click unlike that of its partner on connections 10 and 2 which does operate as expected.
So as is usual, there was more than one fault at play. The relay is sorted and now that it has stopped raining outside I can continue chasing the break in the wiring from sensor to pump module. But I have hit the next snag. I know that I need to test for continuity at pins 6 and 18 of the harness connector but can someone please tell me what the numbering scheme is on the connector and what colour(s) would the wires be that serve the right front sensor?
Thank you in anticipation.
P.S. I have ordered a better scanner, one that does more than just engine tests.
Having removed the plastic mud guard from the left wheel arch I was able to get at the ABS pump module and its 36 pin harness connector. Taking a picture of that and enlarging it on my computer screen showed me the pin numbering that I had been seeking.
I was able to check for continuity of the sensor to module wiring. It was ok.
Put the car back together again. next day, my new scanner arrived and after several hours of software download and update I was able to use it to do a scan. Result showed front right sensor fault and now I was better placed to more easily check the car's vitals. It also showed a hitherto unknown problem with the glow plugs relay, but that's not important, for now.
Decided that it was time for a new sensor so having purchased one today and fitted it tonight, the "ABS System Fault" has gone.
Thanks to those who have commented on this thread. Your advice has prompted me to buy a better scanner and to persevere. During this process I did try to source a relay from the main dealer but apart from telling me that the part was no longer in production, showed little interest in my problem. Fortunately a local motor factor worked his sourcing magic and was able to supply a relay for the following morning.
This problem has now been sorted. Thank you.
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