Testing ABS sensor Volvo C30

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Alan SS1
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Testing ABS sensor Volvo C30

Post by Alan SS1 » Sat Jan 13, 2018 9:59 pm

Sorry to post a non-scim question on here but no joy on the Volvo web-site :-(

over last few weeks been getting a 'clicking' noise same as you'd get when teh traction control kicks in an then power drops (sometimes at one and same time) as last week when set off at a roundabout when the TCS light flickered and car power dropped (same as you'd get on icy / slippy road)

I don't get ANY error codes when check with various OBD2 readers, both the app on the phone and a PC based one. TBH I'm not sure if the app actually does ABS . ..

but the PC one 'claims' to do lots of things.

anyway I found a similar fault/issue on S40/V40 online where the drive shaft securing nut if not fully tight allows the shaft to float 'slightly' so carrying the serrated ring to move from sensor. this brings up spurious errors and doesn't always store the fault code (maybe cos it isn't permanent??)

In this car the bearing has a wee magnetic disc as part of the bearing seal and it uses this to give pulses.

did some digging today and it 'appears' as if a chunk of the magnetic ring , about 5 or 6mm is missing

trying to take a photo is ruddy difficult but see a couple of examples.

missing magnetic .jpg
missing magnetic .jpg (135.45 KiB) Viewed 1296 times
any advice is useful,
missing-magnetic.jpg
missing-magnetic.jpg (102.77 KiB) Viewed 1296 times
maybe have to take it to a garage :-(
put it onto the brake rollers to see if we can get the error to appear AND read out/listen where noise comes from?


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Testing ABS sensor Volvo C30

Post by philhoward » Sat Jan 13, 2018 10:57 pm

If you are missing part of the ring, then that will give a plausible (albeit incorrect) signal so I’m not surprised there aren’t any fault codes reporting.

What’s the mark/space ratio and the pulses per rev? Looks like not many compared to modern ABS systems with 20-60 pulses/rev.

Whichever way, you need a new ring.


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Testing ABS sensor Volvo C30

Post by Alan SS1 » Sun Jan 14, 2018 11:16 am

Phil
Thanks, you've confirmed my suspicions , afraid it's not just a new ring, :cry: it is part of the dirt cover on the bearing :shock: I guess that they reckoned more reliable than the old 'toothed' variety.

as for pulses I think the magnetic bits are spaced every 3 -4mm around a 60mm PCD
I think that I was hoping that I didn't need a new bearing at £100 !!! (although when i saw that bit missing it did fill me with dread :-( )
That bearing has only lasted 25k, the first one was a bit 'noisy' (also at 25k) then 'howled' from Kinlochrannoch back to ABZ !!

just changed the other side last month for the spare I'd bought at the same time.

EDIT

just whipped off the sensor plug to that wheel, took it for a quick whirl for half a mile or so ; no problems, no issues, other than a HUGE message saying ABS / Anti skid service required :-)

mind you it was intermittent . . . . . ..


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Testing ABS sensor Volvo C30

Post by peter freeman » Sun Jan 14, 2018 11:54 am

Tut tut - modern cars - stick to older ones - cheaper in the long run.



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Testing ABS sensor Volvo C30

Post by ss1steve » Sun Jan 14, 2018 1:04 pm

Not long ago done the front wheel bearing on the wife's c70, part was £65 from local motor factor ( c30 & c70 are focus based ) new bearing went in the freezer for a few hours, beat the old bearing out & hub went it the oven for 20 minutes, the too went together with a few taps with big hammer :D



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Testing ABS sensor Volvo C30

Post by Alan SS1 » Sun Jan 14, 2018 4:58 pm

Aye I kent FOCUS based, and yes stick to older cars, trouble is that this Volvo is a Ford in drag :wink:

just been away in SWAMBO's 480, (which is an unholy marriage between DAF/Renault/Volvo) BUT much more fun than the C30, and whisper it , nippier than SS1 :shock:

to change the last bearing I splashed out on a 12T hydraulic press and that moved it 'no sweat', this side should be easier as it was already replaced, (i hope)

went back in with a dash of oil and the TANGYE 15cwt version, more control!

£65 sounds CHEAP, I'll give my local guys a ring in AM, cheapest I'd seen on tinternet was around £100 (ish) but cheaper this time than last, they must be selling more of them . . . . .


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Testing ABS sensor Volvo C30

Post by Alan SS1 » Sun Jan 21, 2018 5:07 pm

Update
Removal of bearing was similar to previous efforts and this time it comes with a snazzy 'dust shield that sits on teh drive shaft and keeps most of the rust/debris etc away from said ABS ring.

I also removed any remains of crusty stuff from around the bearing housing , but forgot to apply healthy helping of grease to try and keep rust at bay for a bit longer. paint might have worked given A time & B air temp > -3C

anyhow see photo of offending object
C30 Bearing no  ABS ring.jpg
C30 Bearing no ABS ring.jpg (86.14 KiB) Viewed 1127 times
I'll maybe pull the drive shaft from the other side (ie leave shaft and pull arm away from it) and fit a similar dirt shield to save myself £75 and a whole morning's work

and grief from SWAMBO


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Testing ABS sensor Volvo C30

Post by reliant-reviver » Mon Feb 05, 2018 10:33 am

I'm having fun and games with the ABS on my Mitsubishi.

Broken wire to the OSF wheel sensor, and despite a fruitless hour chopping back and joining new wire in, it seems the copper wire is oxidized the whole length

Mitsubishi want £146 plus VAT with a few weeks wait :shock: P/N# MR370908

A fiver donation to the forum on behalf of anyone who can track down a replacement for a far more reasonable sum.


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Testing ABS sensor Volvo C30

Post by philhoward » Mon Feb 05, 2018 10:48 am

Tried one from something similar? https://www.amazon.co.uk/ABS-SENSOR-Fro ... abs+sensor for example might have a suitable sensor on the end, so a bit of cut and shut on the cable/connector end? Or is it not that easy?


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Testing ABS sensor Volvo C30

Post by reliant-reviver » Mon Feb 05, 2018 11:20 am

It's a fair suggestion, and a fall back option.

Finding parts for a 2001 car shouldn't be this difficult!


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Testing ABS sensor Volvo C30

Post by philhoward » Mon Feb 05, 2018 11:22 am

The joys of JDM imports..


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Testing ABS sensor Volvo C30

Post by reliant-reviver » Mon Feb 05, 2018 11:39 am

It's a bloomin' UK car though! Rare sight on the roads though I'll grant you that.

Taking your suggestion though, I've ordered an "MR289343" sensor for a spacewagon. looks very similar, and the plug connection is at least correct (male pins) so that gives me wiring to play with if nothing else for £8.99 delivered.

Q. The sensor itself is visibly different at the end. Is a double diddler different in function to a single one?
37637f83ee824d8d902f16cd39ad1282_water.jpg
37637f83ee824d8d902f16cd39ad1282_water.jpg (77.68 KiB) Viewed 1022 times
IABSMT004-ABS-Sensor-for-Mitsubishi-MR407270.jpg
IABSMT004-ABS-Sensor-for-Mitsubishi-MR407270.jpg (65.15 KiB) Viewed 1022 times
Just to tie it back into Alan's original post, if this year the Galant causes me too much jip, I'm moving it on and a Volvo wagon is the top of my possibles list.


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Testing ABS sensor Volvo C30

Post by philhoward » Mon Feb 05, 2018 11:51 am

Having had a quick nosey around various Mitsi ABS sensors, there seems to the Legnum one (double dib), but also other double dib ones at various spacings (EVO, Shogun of various ages) which may have an effect..either that, or it's just different colours of the component plastic used.

This is what I think yours is?
Capture.JPG
Capture.JPG (81.85 KiB) Viewed 1017 times
Pic from a place that lists (doesn't mean stocks..) at a tickle under 21,000 Yen which is about £135: https://www.rhdjapan.com/mitsubishi-oem ... kouki.html

My mistake - I thought it was a JDM Import - probably 'cos most of them here are!


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Testing ABS sensor Volvo C30

Post by reliant-reviver » Mon Feb 05, 2018 12:58 pm

That looks very much like the right part so I shall follow up on that. Think I shall extact the old one and compare it to the spacewagon part first and go from there.

Is the resistance likely to have an effect on the ECU and upset it? The other 3 are about 1200 ohms and giving a suitable spike in voltage when spinning each wheel. The one I repaired (badly!) was reading around 2200 ohms at the connector.
I could possibly splice the wiring off the new cheapy ebay sensor near enough straight in the back of the current sensor, without disturbing it (they never extract well) but it may still be giving a higher resistance.

Hmmm. Wondering, perhaps I could find a s/h one with a Legnum still attached :twisted:


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Testing ABS sensor Volvo C30

Post by philhoward » Mon Feb 05, 2018 1:27 pm

Generally, ABS systems do a "static" check on startup which is nothing more than a resistance check. It would probably fail as that's too much of a discrepancy (10-20% would be my ballpark).

Second check is that it sees a similar signal from each wheel when you start moving - a higher resistance will produce a lower voltage signal (or no signal at all) which will again, send the ABS controller into a hissy fit.

3rd check would probably be what Alan had on his (given it was his thread..) - a signal that is plausible but not quite right, hence another reason for the MoT fail light of doom.


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