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Old 10-10-2021, 10:16 PM #1
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Code 39 debris on sensor or tone ring

Well shoot I reckon this post isn't interesting enough to consider! For some reason the 2010 4runner, first year of the 5th gen, has hardly any informative resources. I can't even find the rear hub assembly diagram. Every single diagram I find shows a toothed ring. No toothed ring that I can see through the sensor hole. Im guessing there's a multipole ring. Just so y'all understand the difference between these type of tone rings I attended pictures. I just want to clean my abs tone ring! Taking it completely apart and knowing for sure might be easier than getting some information from a forum.
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Old 10-11-2021, 12:18 PM #2
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Talking

The abs sensor ring is part of the front axle hub bearing assembly with the pole side faciing the speed sensor. Attaching a DMM switched to ac current to the speed sensor produces a faint current. It does not accurately depicts the pulse but can show blank spots if there is debris on the tone ring. Using a long oil paint brush soaked in crc electronics cleaner or denatured alcohol you can clean the tone ring.
Tech stream shows the pulse and will show the interference from debris on the ring.

see attached fig from the fsm.
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Old 10-11-2021, 12:47 PM #3
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Thank you! Looking inside it looks really clean. I blew it out with compressed air and some whirling noise happened for about ten seconds. Sounded kind of like a small electric motor. Wondering what it is. Thanks for the response.
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