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C4 Grand Picasso 2009 ABS / ESP issues |
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HardNock
 
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   Member No: #59603
Joined: Apr 11 2022Location: Bridgend, South Wales, UK |
Hey all, I'm new here but have owned Citroen and / or Peugeot cars most of my driving life. I purchased a 2009 C4 Grand Picasso VTR+ 1.6 HDI with a 6 speed semi-automatic gearbox in March of this year. Lovely car, very clean for the year. I had no issues with the car until I had a tyre replaced and tracking altered, after which I was getting intermittent issues with an ABS sensor (triggering the usual ABS / ESP / Parking Brake / Gearbox fault messages). DiagBox (and an Autel diagnostic handheld device) displays error code C1 331 Front right wheel speed sensor signal fault and was unable to select higher than third gear. Stopping the car, turning off the ignition and starting the car back up then pull off and drive cleared the fault, assuming because the speed sensor was picked back up. This was quite intermittent and only seemed to really occur on longer drives when getting to 50+ MPH. The speed / ABS sensor itself was disgustingly filthy so I cleaned it up but the issue remained. I purchased a new sensor and fitted it, but now the fault is permanent. If I clear the fault and drive off, the same fault re-occurs almost immediately. I removed the new sensor thinking it may be faulty and re-fitted the old sensor, but this also now triggers a permanent fault. I've removed the wheel and cleaned around the whole hub, wheel bearing and driveshaft as they were pretty dirty but the permanent fault remains. I can't drive the car any more as I can't select higher than third gear. When I check live data, there's voltage on each corner so the sensors are being detected by the module. Any ideas? I'm now at a loss! I don't want to believe the ABS unit itself is faulty, it seems too coincidental that the fault only occurred after a tyre change and tracking adjustment (the tyre was o/s rear, so not the same corner as the fault) and the permanent fault only occurred after changing the sensor. | ||||
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HardNock
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Member No: #59603
Joined: Apr 11 2022Location: Bridgend, South Wales, UK |
Just to confirm what I've already checked, considering this seems to be a common issue (I also had the same issue with a 2012 Peugeot 308, on the same corner, a speed sensor change didn't fix this either but changing the ABS ring did - the C4 has no ABS rings on the front, none that I can find anyway):-
As mentioned in my original post, I can erase the fault code but the error reoccurs almost immediately after pulling off. |
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HardNock
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Member No: #59603
Joined: Apr 11 2022Location: Bridgend, South Wales, UK |
I realise this is in the wrong forum (right car, wrong sub forum) but I can't find a way to move it. Anyway, I've bought a new Active Sensor Bearing for the same corner and just fitted it but still getting the same issue. Kinda stuck now, not sure where to go from here? |
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Farmerguy
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 Member No: #59597
Joined: Apr 10 2022Location: Denmark west part |
Hi did you also change the magnetic abs ring with the bearing? Can it "see" speed when you drive on the diagnostic tool? | ||||
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HardNock
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Member No: #59603
Joined: Apr 11 2022Location: Bridgend, South Wales, UK |
Hi Martin, There's no magnetic ABS ring on the front axle of my car, just on the rear. The ABS sensor reads the Active Sensor Bearing (wheel bearing) on the front axle, which has been changed today, without rectification. The diagnostic tool does detect the sensor and displays speed, until the car reaches about 10 mph, which is when the fault occurs. Craig. |
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Farmerguy
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Member No: #59597
Joined: Apr 10 2022Location: Denmark west part |
Hi yeah it was the one i meant, the protector part of the bearing. Then it reads the suspect areas are connectors and electric harness. The conditions of the fault is also 20km/h so that's like what you write. |
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HardNock
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Member No: #59603
Joined: Apr 11 2022Location: Bridgend, South Wales, UK |
I fixed the issue and thought I'd post the solution in case this crops up with someone else. The sensor and active sensor bearing both turned out to be fine and functional, as were the connectors and electric harness. It turned out that the sensor mounting had been knocked slightly out of place somehow. The only work done to that corner was the tracking correction, as mentioned in my original post. I took measurements and compared them with the n/s front corner and the o/s front corner which returns the error differed by a few mm. I manipulated it back into position and the error hasn't returned since. | ||||
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tomandjo2
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  Member No: #20851
Joined: Jul 17 2011Location: Cambridge |
Well done! | ||||
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