We some times get a seemingly simple diagnosis we can't explain. This is one of those times. This 2002 Ford Explorer Sport Trac came in with an ABS light on and a not functioning Right Front Speed Sensor. Simple right!? -Enjoy!
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50 thoughts on “Ford explorer sport trac: abs light on / wss signal i can not explain??”
  1. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Interesting how the signal is pushing slitley above the 0v scale 🤔 did the sensor go high resistance 🤔 Eric O @SouthMainAutoRepairLLC

  2. Avataaar/Circle Created with python_avatars Efrem Williams says:

    Exactly why I never wanted to be an engineer, I learned their were tolerances and values that I would never understand.

  3. Avataaar/Circle Created with python_avatars Coy Hilron says:

    Shove a Q-tip in the hole and clean out the crap in the hole

  4. Avataaar/Circle Created with python_avatars Coy Hilron says:

    If you have lighting that uses ballast sodium or florescent it can induce noise into the body of the truck.

  5. Avataaar/Circle Created with python_avatars Coy Hilron says:

    You know the issue is the sensor or crap between the sensor and the wheel

  6. Avataaar/Circle Created with python_avatars Jason Ross says:

    the signal isnt strong enough i think the sensor isnt near enough to the moog hub to see a good signal..that or the hub has got alot of stuff like salt stuck to the hub 🙂

  7. Avataaar/Circle Created with python_avatars Russell Jones says:

    Could of tried removing the shim on the week side may have increased the wave. if there was still clearance.

  8. Avataaar/Circle Created with python_avatars Kingship LLC says:

    shim it out with a washer

  9. Avataaar/Circle Created with python_avatars Sal Demarco says:

    You look like your Lit you on that sauce 🔥 🔥🔥🔥👍🥴🥴💯💯🔥

  10. Avataaar/Circle Created with python_avatars Phil Lully says:

    Okay great tip Eric O. on that wheel speed sensor fit due to length difference from a standard size.
    Go figure Chinese parts.. Will we ever get back to good ole American parts?

  11. Avataaar/Circle Created with python_avatars Grant Hodge says:

    Maybe the longer WSS was the correct one.?.

  12. Avataaar/Circle Created with python_avatars phil merrifield says:

    That doesn't look like a sine wave to me looks more like a sawtooth wave but I'm probably going to get a comment explosion saying I'm wrong but brilliant editing and explanation of steps and troubleshooting keep up the excellent work, stay safe and well

  13. Avataaar/Circle Created with python_avatars Shawn Perry says:

    What if you already replaced one brand new hub up front and the same abs issue is happening? Abs light had been on for a while, drivers speed sensor wire was cut for atleast 2 years, 2003 ford explorer sport trac xlt finally the bearings started to roar. Replaced drivers hub yesterday.

  14. Avataaar/Circle Created with python_avatars Tombs says:

    had that problem on my 01 sport trac (your one explanation)
    no abs light on but abs kicking in coming to a stop.
    Had to make a habit of starting to brake like 10 feet++ prior to where I normally would.

    or else I would rear end someone or go into the intersection

  15. Avataaar/Circle Created with python_avatars CHUCK timm says:

    mine the breaks are coming on and RSC BUZZ AND ALARM IS COMING ON THEN GOES OFF I PULL ALL 4X4 FUSES AND IT WILL DRIVER but RSC still comes on with tc abs lights

  16. Avataaar/Circle Created with python_avatars Douglas Johnson says:

    Sometimes older Mook hubs get magnetized and stops the wss from reading accurately. I had the same issue and found that out by chance!

  17. Avataaar/Circle Created with python_avatars Desert Mike DIY says:

    If the cables going from the speed sensors to the abs module were disconnected at the abs module, then any dc bias source in the abs module would be eliminated. What screen capture software you using for the Pico video inserts? Quite well done.

  18. Avataaar/Circle Created with python_avatars parochial2356 says:

    Good example of raw data versus processed data.
    "Look at all my trials and tribulations,
    Sinking in a gentle pool of antifreeze.
    Don't disturb me now, I can see the answers…."
    [The ballad of Eric O.]

  19. Avataaar/Circle Created with python_avatars explotole says:

    greetings friend i'm from venezuela i say bad english i use google to talk to you … I have an explorer 2010 4.0 v6. I have abs lights on, skidding, handbrake … the scanner code b1342 error or ecu error appears. The module was sent to be checked on a test bench and everything went well, I tested the direct positive 2 pins (1-32) and the direct ground (16) on the abs module cables as well as the positive one for the suiche. I also tested pins 12-13 of the 61 ohm given by the two module communication pins … I would like help with this friend please something else that I can review. here the situation is difficult to have experts … the 4 abs sensors are perfect the scanner allows me to see that they work perfect …

  20. Avataaar/Circle Created with python_avatars Federico Montelongo says:

    wheres that German caliper scraper thing lol

  21. Avataaar/Circle Created with python_avatars Jeff Jankiewicz says:

    Oh boy, an Exploder!! Look at all the crusties on that thing!!

  22. Avataaar/Circle Created with python_avatars Garth Clark says:

    Regarding Moog and being Chinese made parts. Guess who else is made in China? OEM parts are. GM, ACDelco and all of them. Parts are Chinese. Even though Moog is associated with a large mother corporation, they still are good parts as any other. Just my opinionm having much experience with trying to get USA OEM when I can and finding the OEM part boxes labeled China.

  23. Avataaar/Circle Created with python_avatars Corbett Knowles says:

    Stay voltage would be my guess

  24. Avataaar/Circle Created with python_avatars Fred Bach says:

    Ok. I haven't finished this video yet but I gotta say that when you see a DC offset from a device that isn't supposed to generate DC, two areas to investigate are thermocouple effects and chemical effects. A little bit of salt in the wrong place can do it. Did you measure the DC resistance of each sensor? Did you check it's impedance? Did you measure if that ac waveform generated can stand a normal AC and DC load? Your scope won't provide a low enough impedance to check that. There are three other way-out sources of a mysterious DC offset. One is if you have a badly oxidized connection AND a lot of random AC (generally high-frequency RF) field nearby. The scope won't display the RF cuz the frequency is too high. But the oxidized connection will rectify the RF yielding a mysterious and variable DC voltage. OK. That was weird enough. Here's another: a malfunctioning electrolytic capacitor. I don't think wheel sensors have those. An even weirder one is if you are dealing with something radioactive that spits out a charged particle. They do make laboratory current sources out of Carbon-14, for instance. I doubt this is your problem.😉 But seriously, you should compare the left and right sensors into a decent load resistor not just measure their open-circuit waveforms which is what a scope does.

  25. Avataaar/Circle Created with python_avatars The Radio Mechanic says:

    Moisture, Salt and different kinds of metals ( copper steel etc. ) and you have a battery. Probably moisture leaked in with the salt. Viola, voltage offset. ?????

  26. Avataaar/Circle Created with python_avatars Richard Mann says:

    I wonder how well an undercarriage car wash would do in those salt areas? Justs deposit your money, drive over the special water jets and flush all that salt. Could do well during the winter, maybe not so much in the summer, except for mudders.

  27. Avataaar/Circle Created with python_avatars Richard Mann says:

    My brother in law, who is a retired Marine, would flip out watching you hammer with anything other than a hammer. He's really strange about who and how his tools are used. We all have our little quirks.

  28. Avataaar/Circle Created with python_avatars pierre brunet says:

    the abs is looking for a threshold voltage to start recording

  29. Avataaar/Circle Created with python_avatars Richfo100 says:


  30. Avataaar/Circle Created with python_avatars darryl mcleman says:

    Much excitement on the west coast Canada today! 3/8 cordless Mac  ratchet with Dewalt batteries arrived at the door.First seen on S.M.A. vid. And a bonus mac tool truck to stick on the fridge!!!

  31. Avataaar/Circle Created with python_avatars John Pilgrim says:

    I’ve been coming across quite a few moog bearings over the last couple of years with improper gaps on the wheel speed sensors. The Chevy bearings from moog have been the worst.

  32. Avataaar/Circle Created with python_avatars Norman Gallant says:

    The twilight zone that is the explanation

  33. Avataaar/Circle Created with python_avatars Dick Marshall says:

    Clean your file with a piece of copper pipe — flaten one end of the pipe with a hammer, then you can drag and push the end of the copper pipe on the file. Let me know how it works for ya. I need to do it again on mine.
    I am in Arizona retired USAF. I am coming back in May to the finger lakes for two weeks to see my brother. No I won;t brother you, time is money. Have a great day.

  34. Avataaar/Circle Created with python_avatars Harry Sanders says:

    Eric, buy a 4000 psi pressure washer, and blast the shi…. out of everything you work on. HAHA

  35. Avataaar/Circle Created with python_avatars William Wilde says:

    Can we get a tour of your MAC tool truck?

  36. Avataaar/Circle Created with python_avatars Ed ogle says:

    nice show thxs,would like it if made second video….

  37. Avataaar/Circle Created with python_avatars Logan says:

    Does the computer ignore a sensor that it deems out of spec once a code is thrown? Not a professional mechanic, just a Q.

  38. Avataaar/Circle Created with python_avatars jerstuube says:

    I’ve run into 3 times in the past month and have no idea why the ABS module isn’t liking it? Sure it’s a little low but I thought it should eventually pick up. Interestingly all 3 bearing were the same manufacturer of low line bearing. Hopefully if u find the answer please share! It’s baffling me. (And I’m sure my boss would like a proper reason as to why it’s no good, other than “it’s junk” lol)

  39. Avataaar/Circle Created with python_avatars Tim Graham says:

    I've never been a fan of ABS or airbags. I don't need a bunch of feel good "safety" equipment.

  40. Avataaar/Circle Created with python_avatars Jason The Municipal Mechanic says:

    I have a suburban that had about 750-900 milivolts on three wheels and one that put out about 300 mv and it was tripping my stabilitrac during acceleration I used a caliper and the air gap in the hub was within spec. I tried closing it up a smidge and Also tried a different abs sensor in the hub and still same result. So replaced the hub and it worked putting out the Correct voltage.

  41. Avataaar/Circle Created with python_avatars Docoski says:

    I see the comments about two metals and such, are they talking about the shim and hub?

  42. Avataaar/Circle Created with python_avatars Anjelica Dixon says:

    I love You!

  43. Avataaar/Circle Created with python_avatars Garrett McEwen says:

    Nice use of the electrician's hammer there

  44. Avataaar/Circle Created with python_avatars Cobra Ninety Six says:

    My guess is air gap between hub and sensor!

  45. Avataaar/Circle Created with python_avatars Rob Anderson says:

    you know a massive amount about electrical systems, i have been learning lots, thanks for the brake cleaner and extractor set easy out demo, and Mrs. O is wearing a well designed shirt