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V70 tdi. Fixed, broken, fixed. Unexciting update


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#61 ONLINE   scdan4

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Posted 05 March 2018 - 11:40 AM

Mot time.

Amazingly the turded overactive abs behaved itself on the bay. What are the chances of that?

Straight through.

92796E9A-0B94-45E7-B61B-BB1466520E90.png

Happy days.
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#62 ONLINE   scdan4

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Posted 13 March 2018 - 05:13 PM

To celebrate the mot pass the ovlov was rewarded with a sorta service.

I’ve got a new pela. Car was nice and warm so the oil was nice and runny. Much quicker.

68D96296-8CF1-4D64-ABEC-020CA6E99E22.jpeg

Air filter needed doing. I’m wondering if I missed the last service somehow.
856AFB77-20FE-42C4-B64E-BB4EC652B4E9.jpeg

Flushed with the success of the t cut session on the mondeo, and with it to hand I had a go at removing the evidence of a bout of bin fighting.

317E1C43-D9CA-446F-8CBC-7E802FFF145E.jpeg

A9204E12-E58B-4AC8-BAB2-0735626B1CF0.jpeg

There we are, perfect*

And a much more usual size oil puddle from the filter, which is nicely accessible from the top of the engine, so I kinda just let it all fall.

33443741-41F5-41B4-8851-37DEDFB47F03.jpeg

Still pretty good for me.

Does anyone know how to reset the service light?
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#63 OFFLINE   Dirk Diggler

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Posted 13 March 2018 - 06:41 PM


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#64 ONLINE   scdan4

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Posted 13 March 2018 - 08:06 PM

That’s amazingly easy.

Thanks for looking that up for me, can’t believe I haven’t done it before. Lights been on since I got it.
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#65 OFFLINE   sutty2006

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Posted 13 March 2018 - 09:27 PM

Glad the old purple throbber continues its service to you. Mileage unreadable???
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Sideways is the only way forwards!

 

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#66 ONLINE   scdan4

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Posted 14 April 2018 - 06:17 PM

Help please. There is a problem and I don't know how to solve it.

 

The abs is activating a lot of the time under normal, quite light braking. The car usually, but not always, pulls off to the left when this happens. The brake pedal is stiff, graunchy and thumpy, its definitively the abs. There are no dash lights and codes when hit with the appropriate scanner. It thinks it is all hunky dory,

 

If you disconnect the electrical multiplug from the abs ecu unit, the brakes are transformed into reliable, glorious stopping devices with a much lighter pedal and more feel). But the dash shows the abs warning and brake warning lights and the speedo doesn't work. There is also (unsurprisingly) no abs (tested).

 

It first did this shortly before mot time so it was handed to the mechanic with a "please sort it if you can". He took it to his mot garage and they put a proper scanner on it and could find nothing. luckily it behaved long enough to pass the brake test. "it was fine on the bay sir"

 

Initial googles revealed that 850/v70's shit their abs ecus for fun, so although my symptoms didn't match any other ones I could find on the web, I figured it was the ecu and ordered a guaranteed working one from a ebay 850 specialist breakers. 

 

I swapped the ecus, cleaning the multiplug on the way with contact cleaner as it was full of green fur and no dice. Exactly the same. 

 

So it's a wheel sensor then isn't it. I measured the resistance on the sensors today - and as far as I can see they're all within the same ballpark. The rear sensor wires sprout up under the rear seat, so I have no idea about right of left, but can't see it matters now. (All sensors also gave reliable repeated readings.)

 

N/S/F 788 ohm

O/S/F 773 ohm

rear 787 ohm

rear 761 ohm

 

I have no idea of the expected precision of these - should they be 787 on the nose and hence 761 is enough to fuck it up? Happy days if so, but I would like confirmation of that before firing in a new one and being in the exact same position. However, I suspect that is not the problem.

 

Other than that I'm completely stumped, with no idea what to look for next. 

 

My mechanic isn't keen to get stuck into forensic mechanicing and can't say I've got the inclination or wallet fund it, especially as better condition ones keep going for sensible money on ebay, a days work and a couple of parts and it could cost the same as a shiny new* one.

 

But I'd much rather fix her. Is there something else I can check? 

 

Thanks

 

 

 

 

 



#67 OFFLINE   sutty2006

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Posted 14 April 2018 - 06:47 PM

Have you checked all ABS rings? A tooth out can cause similar problems. My carlton currently kicks the ABS in if I turn right at slow speeds under braking and I think it’s ring issue. I also had a horrible shitroen xantia that the abs kicked in under normal braking for no reason. That turned out to be a broken ABS ring on a drive shaft. Few spots of weld sorted that out temporarily
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Sideways is the only way forwards!

 

1976 Manta B coupe

1987 Manta Hatch 16valve

1989 Mercury Grand Marquis

1992 Vauxhall carlton 2.3TD

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#68 OFFLINE   Mrs6C

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Posted 14 April 2018 - 07:42 PM

This ^^^^ would seem to be about right.

 

Here are a few online discussions about the same symptoms. As sutty2006 says, the consensus seems to be that one of the toothed reluctor rings that the ABS sensor reads is dirty, cracked or broken...

 

https://www.matthews...pic.php?t=43065

 

https://www.honestjo...dex.htm?t=64663
Quote: "Typically, unwanted abs activation without an error code is down to a faulty reluctor ring."

 

Handy Youtube video on how to replace said ring:
https://www.youtube....h?v=cqYm8AdbfF0

 

Hope the above are helpful.



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#69 ONLINE   scdan4

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Posted 14 April 2018 - 07:53 PM

Useful, and your Google fu seems considerably better than mine.

I had glanced at the front ones and all seemed fine, but I will have a proper look.
I will investigate and report back

Thanks.
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#70 OFFLINE   Mrs6C

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Posted 14 April 2018 - 07:58 PM

I have a 1999 V70 T5 auto, so have many Volvo forum threads stored as browser favourites! :-)



#71 OFFLINE   SiC

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Posted 14 April 2018 - 08:42 PM

I bet the ABS reluctor rings have a split in them. They rust up and eventually split. The split can be very small but at speed, the centripetal forces open up the ring causing it to slip and move at the wrong speed.

I've had it on the Saab 9-5 and Smart Roadster. Incredibly common problem on most cars as they age to be honest. Can be a pain in the arse on some cars to get them on. Usually involves getting the ring as hot as possible, then using the old ring as a drift.
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#72 OFFLINE   spartacus

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Posted 14 April 2018 - 09:02 PM

I'll concur and say it sounds very much like a reluctor ring fault. Either heavy dirt build up, corrosion or a split, as suggested above.
If your ABS fixing skills are as good as your T-cutting skills then you'll be fine!
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#73 OFFLINE   rainagain

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Posted 15 April 2018 - 08:00 AM

+1 in it being a split abs ring, my oh’s Tucson did the same, no fault code just the abs kicking in when stopping at a low speed.
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#74 ONLINE   scdan4

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Posted 15 April 2018 - 02:23 PM

Thanks all, I was feeling rather frustrated with it yesterday. You’ve all given me hope again.

Will get on it when I can .

#75 OFFLINE   rainagain

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Posted 16 April 2018 - 12:36 PM

I got my replacement ring from ebay, the seller ' dodthebod' was recommended to me. I followed a video on youtube and heated the ring up with a butane torch before I dropped it on the axle. I then tapped it in place, once it cooled it wasn't going anywhere!

 

I found the crack by removing the ABS sensor and rotating the axle, here's a pic of the crack and old v new rings

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#76 OFFLINE   Mrs6C

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Posted 16 April 2018 - 08:56 PM

I found the crack by removing the ABS sensor and rotating the axle, here's a pic of the crack and old v new rings

Hoorah! :-)

 

Well done you!



#77 ONLINE   scdan4

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Posted 25 May 2018 - 07:44 PM

‘‘Twas the reluctor rings and I cheated and paid a man. I did try and do the job myself, twice, but rain stopped play before it had begun on the first attempt and on the second a promising start was nadgered by my discovery that I no longer own a breaker bar. Time is in short supply at the moment, pay a man, Braking restored. Marvellous.

For a bit.

Then there was a smell, quite a bad smell coupled with a fairly horrific rev dependant metal grinding on metal sound. No warning lights or performance* drop, so as I had shit to do, I ignored it until i got it parked neatly at work. Lots of smoke, all coming from the alternator.

Replacement sourced and fitted - which was a twat of a job as there just wasn’t quite enough room to birth it out of its cubbyhole... but got there by taking out the headlight, loosening the radiator and having 4 hands on the job.

Normal service resumed, which is really very very nice as it’s out working all weekend. Waiting for yodel was a nerve wracking couple of hours.
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