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Post by chippie on Dec 16, 2023 16:51:30 GMT 1
No1 son's tiggy keeps coming up with F/O wheel tyre pressure error in tpms.
It will clear but then comes back after driving several miles.
AFAIK, it doesnt have active measurement, relying on angular wheel velocity...
So, it could be an abs sensor, but the ABS system isnt reporting any issue?
So before I start ripping into taking things apart, anyone got any suggestions?
Scanning the vehicle with VCDS comes up with C102D 00....
Looking that up on Googlemechs comes up with a load of unhelpful non-sense..as usual
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Post by Noberator on Dec 16, 2023 17:53:29 GMT 1
Chip Have you checked the tyre in question to see if there's any signs of a slow puncture?
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Post by chippie on Dec 16, 2023 18:35:43 GMT 1
Yup, we checked the obvious first…
I think we’ll swap the front wheels over first, and while the wheels are off, check the o/s speed sensor…
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Post by OldGit on Dec 16, 2023 19:36:55 GMT 1
Is the tyre size correct & the tread depth significantly more or less than the others? Is it a TPMS error or a low tyre pressure warning? If it's a TPMS error, then something is implausible - remember that wheel speeds differing is 'normal' for ABS and won't throw a DTC unless outside of the bounds of plausibility (like one wheel reading 0 and the rest reading 30mph) or it sees one of the sensor circuits having an electrical defect. Also check the wheel bearing and have a look at the reluctor ring through the sensor mounting hole to make sure it's still in one piece.
ETA - also check the same on the other side, it could be throwing the expected values out.
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Post by chippie on Dec 16, 2023 19:46:00 GMT 1
Is the tyre size correct & the tread depth significantly more or less than the others? Is it a TPMS error or a low tyre pressure warning? If it's a TPMS error, then something is implausible - remember that wheel speeds differing is 'normal' for ABS and won't throw a DTC unless outside of the bounds of plausibility (like one wheel reading 0 and the rest reading 30mph) or it sees one of the sensor circuits having an electrical defect. Also check the wheel bearing and have a look at the reluctor ring through the sensor mounting hole to make sure it's still in one piece. ETA - also check the same on the other side, it could be throwing the expected values out.
Low tyre pressure warning… Both front tyres are the same size as are the rears, tread wear is normal.. As for wheel brg, the car has just gone thru an MoT at Halfords…(rear spring showing signs of cracks..) and come out with a clean bill, so not expecting a brg issue. the abs sensors are handed, so cant swap them over.... I’ve told him I need the car to look at proper sometime…due a service soon so may get a look see then…
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Post by OldGit on Dec 16, 2023 21:42:28 GMT 1
Is there a steering angle sensor? and is it reading correctly?
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remmington
Apprentice
Owns Spark Eroder
Posts: 4,971
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Post by remmington on Dec 16, 2023 22:21:45 GMT 1
Is there a steering angle sensor? and is it reading correctly? My Passat highline estate was pig for the indirect TPMS system. Light was always coming on - but tyre pressures seemed OK with a (newish) PCL Accura Mk4 digital inflator Had to over inflate tyres - reset and roadtest - then deflate and then it would be OK. Never was really sure of the reason. But since replacing the mixed set of 2x Goodyear/2x Kumho tyres with a matching set of Continental Premium Contact 6's The TPMS light has never been back on.
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Post by chippie on Dec 16, 2023 22:48:13 GMT 1
Is there a steering angle sensor? and is it reading correctly? Probably….and don’t know.., More to check out I guess…thnx
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remmington
Apprentice
Owns Spark Eroder
Posts: 4,971
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Post by remmington on Dec 16, 2023 22:54:43 GMT 1
Is there a steering angle sensor? and is it reading correctly? Probably….and don’t know.., More to check out I guess…thnx Is it a 4x4 Tiguan and is the Haldex unit starting to play up?
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Post by valhalla on Dec 17, 2023 0:40:56 GMT 1
I'm not very impressed with even the direct TPMS on VAG ; I have a local Fabia on a 2023-plate that is endlessly setting the warning on the dash, yet the tyre-pressures are within 0.5psi of each other and the whole lot reset twice. I'm told it has been OK over the last 3weeks, but it seems overly-fussy.
Only link between "faults" on this system (it doesn't actually have any codes, so the TPMS thinks it is fine in that respect) is a certain bit of road at a certain time into each journey - seems to set each time, just there!
As OldGit mentions, worth checking the wheel bearings in-case the signal is being momentarily disrupted, but also the security of all the wiring and clipping in that wheelarch, also the connector to the ABS sensor.
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Post by chippie on Dec 17, 2023 9:32:55 GMT 1
Std tiggy, no Haldex..
There hasn’t been any work done on it that would involve disturbing the wiring…
I’m leaning towards the abs ring either dirty or damaged..but without looking it’s a wild guess really..and potentially an expensive repair if it is…the ring is part of the bearing carrier isn’t it?
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remmington
Apprentice
Owns Spark Eroder
Posts: 4,971
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Post by remmington on Dec 17, 2023 9:40:41 GMT 1
I'm not very impressed with even the direct TPMS on VAG ; I have a local Fabia on a 2023-plate that is endlessly setting the warning on the dash, yet the tyre-pressures are within 0.5psi of each other and the whole lot reset twice. I'm told it has been OK over the last 3weeks, but it seems overly-fussy. Only link between "faults" on this system (it doesn't actually have any codes, so the TPMS thinks it is fine in that respect) is a certain bit of road at a certain time into each journey - seems to set each time, just there! As OldGit mentions, worth checking the wheel bearings in-case the signal is being momentarily disrupted, but also the security of all the wiring and clipping in that wheelarch, also the connector to the ABS sensor.
I think I like the indirect systems better than the direct systems. Less to go wrong - no valve sensors or RF pickups. But when a indirect system goes wrong - it normally a wheel speed sensor or a rotor ring. It is intermittent faults with indirect systems I can never ever work out what is wrong with them. But my Passat looked like it was a matched set of worn rear axle tyres that was the problem - tyres good enough to pass the MOT - but not good enough for the TPMS system on my VAG.
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Post by Noberator on Jan 5, 2024 18:18:28 GMT 1
Chip Did you get to the bottom of this and fix it for your son?
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Post by chippie on Jan 5, 2024 18:51:00 GMT 1
No not yet….
Was going to look at doing it over the new yr but I got sciatica..
Looking to check the front o/s wheel brg housing for the mag ring condition and go from there….
I don’t have a 34mm( ? ) socket yet either for the bolt….,
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Post by chippie on Apr 24, 2024 17:02:42 GMT 1
Got a further chance to look at this today.
I removed the front o/s sensor, check it physically, no damage…the abs ring look rather rusty… Put it all back together..
VCDS is reporting that the speed of the wheel is ok, as same as the other three…however the air gap is reading 65335mm! But so is the front near side?…yet the 2 rears are reading around 7mm each…
So do we have 2 duff front wheel bearings? Is the rust sufficient to throw a gap error?
I don’t want to buy 2 new brg assemblies if this doesn’t solve it..
Any thoughts chaps?
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