Magneto Resistive ABS Wheel Speed Sensor Test - 2006 GM

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In this video we are working on a 2006 Chevy Colorado with a left front wheel speed sensor code. This is a digital type wheel speed sensor, so testing methods vary from the standard VR sensor.
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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24 окт 2013

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Комментарии : 141

@adishajrovic2082 7 месяцев назад

Here is a another GOLD MINE video made by Mr. Danner also very good videos and explanations, very easy and simple to understand.

@ScannerDanner 10 лет назад

Agree 100% about the voltage level being different on a different car. IT also will matter what test light you are using. I have used an incandescent light many times but I like the LED light here much more. Better to be safe than sorry.

@malondc1 10 лет назад

The premium is worth gold im subscribing right now. i already bought the ebook and the video lectures 13,14 and 15 thanks paul this is great

@estrelladelnorte1308 10 лет назад

thank you , you know we really enjoy your channel sr , and we apretiate what you do for us , you have no idea how much i have learned from you, thanks for being who you are .

@bbmd2200 Год назад

Love this video because it allows me to see how using an LED test light can be a good thing and can sometimes get you in trouble. I have been thinking of buying one, but have not been able to do that because I usually use a DVOM or an incandescent test light. Especially, after watching one of your most recent videos, where you used the ohmmeter and the diode function to inject a small voltage into the signal wire to check for signal wiring integrity. Wish you and your family a happy new year! Please, Keep Haiti in your prayer. Only Divine intervention can help us out of the mess that we are in.

@michaelgalvin1024 3 месяца назад

Great, I remember this one, it was when you started using smooth introduction pictures/ images. Nice one, thankyou. Mike Galvin

@masksareforwhitepeopleonly4311 10 лет назад

feeling thankful for all the info you already put out there for free thanks, in no way do I feel pintle humped 10 bucks a month thats a deal bro

@ScannerDannerPremium 10 лет назад

Thanks man, and I really value your contributions as well. You have much to offer yourself.

@andyamanda5777 4 года назад

You are genius ! Well done, im very impressed.

@fuckjewtube69 2 года назад

This is still valid and solid information.

@vencentbauer 7 лет назад

nice video Paul I learned a lot on tgat 1

@Jay-vi7el 11 месяцев назад

Great explanation between led and non condesent test light

@victor35ma 10 лет назад

I'll show you how you can test this sensor and the abs ring in one min or less: using a Pistol grip style soldering gun removed tip. The soldering gun connected to power(110 acv) it creates a lot magnetic waves then place the gun as close as you can to the sensor then watching the scanner abs PID specific for that wheel you will see the sensor inputting a lot volt to ABS Module. That’s suggesting good sensor and wiring. Thanks Scanner Danner for another super good lesson appreciated

@ElectronicWorkshop 10 лет назад

your explaination of the test methods to verify the workings of the circuit is very clear, i only wish i could be as clear as you I was describing the inside electronics of a simple LED Light your right about the resister inside the computor, all you need to know is its a high value resister. Keep up the good work, the videos are great

@Mikesky10 7 лет назад

hyundai uses this type of sensor as theres speed wheels sensors, the problem is that when there is any malfunction on it circuit the computer sets a DTC and stops sending the 12 v to feed the sensor inmediatly, but you can see a 12v pulse before it detects a failure in the circuit a stops feeding the sensors, and to check the signal/ground wire do a by pass test like you show in this video!!!, thank you for teaching so much Paul!!!, amazing as always!!!!

@plupkination 5 лет назад

Whoa wait! I have been going nuts with my 2006 Hyundai sonata GLS's ABS system, and this video is the most similar situation to what I have.. I recently had a driver's side front axle replaced after a catastrophic ball joint failure (wheel almost fell off), after which my ABS as well as my ESC lights both came on (already checked sensor lead integrity, it is still good).. So what you are saying is that if the mechanic maybe disconnected the sensor with the ignition on, or if the sensor came unplugged during the ball joint failure, that the car's computer stops sending the feed voltage to the sensors?!??! How do you reset this??! PLEAAASEE!!!! Should it just reset after turning the ignition off/on? Or is this something more complicated to reset?? PLEAAASE HELP!!

@ScannerDanner 10 лет назад

Nice! Thank you for that. That gives me an idea for a video. Open and short circuit testing with a test light using both LED and incandescent lights.

@ScannerDanner 10 лет назад

I think you are addressing one of my questions in the video. What I didn't know was what the resistor value was inside of the computer on the signal circuit. Not that it matters, I was just trying to explain to some why we did not have a complete 12v drop across the LED light when connected to the signal circuit.

@kerdainkelly8740 4 года назад

Living legend and great teacher

@TRcustomengineering 10 лет назад

Thanks again for another awesome video!

@steveguest8028 4 года назад

Great video Paul thank you 👍

@MitchMartinEngineer 10 лет назад

Good stuff Paul! Keep doin what you're doin!

@nickayivor8432 2 года назад

KNOWLEDGEABLE Sir ScannerDanner Good Morning 🙏 🌄 Take care and have a great day 👍 Tutorial helpful video Sir ScannerDanner From Nick Ayivor from London England UK 🇬🇧

@miltonscornertobylove5068 8 лет назад

I sure did learn something! Aweson video.

@ScannerDanner 8 лет назад

+Milton Solis thanks for watching Milton!

@PompeyMatt17 6 месяцев назад

10:49 on plastic "pull down" sensors the ground is the brass ferrule where the fixing bolt goes through, inside is an earth wire to the sensor

@ScannerDannerPremium 10 лет назад

I did, it is in the video itself. Make sure you do not turn the captions off when you watch my videos. Thanks!

@Mummyy84 10 лет назад

Still great video the led ligth volt testing was new to me. Thanks :)

@abbeyrham4220 10 лет назад

always good quality information, thank you Paul. could u please do a video on the AC type sensors too.

@ozzstars_cars 10 лет назад

informative, thanks again Paul

@jHuff-dm7lz 10 лет назад

Yes, very good video. As always.

@maximobautista4854 8 лет назад

great video. thanks.

@vasiavisilievic1873 2 года назад

As an alternative, you could just swap the wires on left and right sensors, to find out if the sensor or the wiring is bad. Can't think why this method wouldn't work.

@Caradonia 10 лет назад

Just to back up your point on the L.E.D test lights, I just carried out a quick experiment. I've got a very well known brand of test light that was expensive for what it does. At 12.6v this test light carries 14mA of current. Using a 5.1kOhm resistor in series (5100ohms) on the ground side of the resistor, this thing still lights up! This is last thing I'd rely on for finding ground faults that's for sure!

@everardocamacho5063 7 лет назад

Thank you paul,

@trublue2319 5 лет назад

Great video

@JOHNPHUFNAGEL 10 лет назад

Paul great video in the part of this video when you said "How does the computer know when there is a wheel lock up" I was under the impression that it compared the signal between the lock up wheel and the other 3

@gvvq-pi5ml 10 лет назад

Hi Paul, you are right of course, I didn't think about the absence of an earth wire so not a hall effect chip, and yes about the switching so obviously not the reluctor or gap..cheers - Fred.

@ScannerDannerPremium 10 лет назад

Thank you my friend

@kingbodetailthebestornothi9997 Год назад

Excellent!

@ScannerDannerPremium 10 лет назад

Thank you!

@ElectronicWorkshop 10 лет назад

great video Dan LED circuit design have a high value resister to limit current in the led, this resister is determined by the current rating of the light emitting diode, the led has a voltage drop of between 1.8v and 3.3v. depending on the type of led, you can find the value of the current limiting resister if you know the led voltage drop and led current rating

@user-wd1rj6sb5l 5 месяцев назад

I think that the design is an internal resistance in the PCM connected to the ground inside, let us assume its value (1 k ) ohms, and the positive line coming out of the PCM is 11.6 volt , and the sensor is two resistors whose values, let us assume (3.87 K ) and ( 6.73 K ) ohms, are connected in series and fed to the source ( 11.6 Volt ), One of the two resistors ( 3.87 k) is connected in parallel with a transistor that connects and disconnects with the rotation of the wheel. When the transistor connects, it will cancel the resistance ( 3.87 k ) ohms , and thus the internal resistance of the PCM, which is 1 kilo ohm, will become connected in series with the resistance (6.73 k) and thus the voltages on the PCM pin will be ( 1.5 volt ) But when the transistor is cut off, the three resistors become connected in series, and thus the voltage becomes ( 1.5 volt ) volts , this is my think

@ScannerDanner 10 лет назад

Also, you are correct in that any time we call a bad ABS sensor we should always verify air gap and check for a cracked tone ring (this is not possible on the units that are combined with the wheel bearing assembly). In our case I do not believe that was necessary. Remember the voltage levels? .6 with it low and 1.8 with it high? We had a flat line 0v signal. I do not believe an air gap problem would cause that. The signal could be fixed, but not at 0 on this design.

@ScannerDanner 10 лет назад

In our case I do not believe an air gap could be the problem. Remember the voltage levels? .6 with it low and 1.8 with it high? We had a flat line 0v signal. I do not believe an air gap problem would cause that. The signal could be fixed, but not at 0 on this design. But I agree, a visual is always in order when testing ABS sensors.

@ScannerDanner 10 лет назад

The computer and it does monitor the feed side too. At least for opens and shorts. I am not sure how much on this design that it is "watching" the feed voltage for signal interpretation. I did prove that the signal is monitored on the other wire though right? You will see in my next upload, that this changes. That on some it is the feed side that is monitored for a signal. And again, I know that current is also monitored on these too but that doesn't change our diagnostic approach.

@Caradonia 10 лет назад

Look forward to it. Your book ebook is great by the way. Highly recommend it to anyone thinking of buying it.

@redsson6669 10 лет назад

great video as always, are you gonna be making part2 of the picoscope training?

@flapbean Год назад

Great video, thank you. What should I be looking for in the service manual as to what tolerances are acceptable? Cheers

@ScannerDannerPremium 10 лет назад

Thank you so much. I promise to uphold my end of the bargain.

@Caradonia 10 лет назад

Great video again, Paul. Thanks! A simple way to explain the test light lighting is simply two resistors in series. The L.E.D being one of them and likely to be around 900ohms, which will leave very little for the computer resistor.

@7minnow 5 месяцев назад

Mr Paul, can’t find your friend on the LED on the internal design of the testlights Thanks SD the Best

@all-about-programming 3 года назад

You the best......

@99rattle 10 лет назад

Nice explanation on the testing speed sensor. One question wouldn't the sensor air gap be a factor to the problem shown as well ,due to corrosion & mislead you to replace sensor ??

@jarredtoms9637 9 лет назад

Good video, the only thing i would comment on is (and please correct me if im wrong) but by not using a wiring diagram you could in theory have the 2 wires round the wrong way on the abs plug (unlikely, but still very possible if a vehicle had a wiring repair or a new incorrect harness for example) im not sure what effect this would have on the system, but my guess would be a good power feed but missing or incorrect voltage out, which would lead you to replace the sensor or look for mechanical defects.

@7minnow 2 года назад

You Da Man SD

@ScannerDanner 10 лет назад

Hopefully soon. Got a lot on my plate

@sunnypatel1524 4 года назад

Sir you said in the video that you will leave a link to somebody's video. The video in that explains internal cuircit of speed sensor. But, I did not find that link

@ScannerDannerPremium 10 лет назад

An air gap issue is always a concern, but in this case an air gap issue would not have caused a 0v signal all the time. A good visual inspection should always be done though for sure.

@bwdz75 4 года назад

One thing to add is that on the Colorado they are famous for throwing a code on the incorrect sensor. Also the design of the brakes makes it very easy to damage the bearing magnetic ring or -/+ ring if that's what they're called when removing or replacing the rotors and it is difficult to re use the sensor and sensor holder with the correct gap particularly when rusty

@jonka1 4 года назад

@20:18 I always thought that the computer compared wheel speeds to detect full or partial lockup. Surely to make decisions on individual rate of change is going to take more computing power at the same time as it's monitoring the other wheels. Or am I wrong? Great channel I've just found you. Subscribed.

@ScannerDanner 10 лет назад

What are you said about? I am not changing anything I do on this channel. Just moving all of my classroom lectures and future live events to a paid subscription channel. It will be way cheaper than what I am charging for the lecture videos now and as long as you are a subscriber the videos never expire.

@twiggy04072 10 лет назад

The voltage levels you measured indicates there is a 100 ohm sense resistor in the signal side of the computer because that sensor is designed to switch between 7 and 14mA. Just wondering if you tried to measure that resistance with power off.

@gvvq-pi5ml 8 лет назад

Hi Paul i believe most LED's use 20 to 30 mA, except the 12 volts ones, i don't know about those, from Fred in UK

@pierrebrunet1529 3 года назад

mercedez uses this type of sensor ,is there a difference in voltage fluctuation on the negative side of the wire

@ScannerDanner 10 лет назад

It's probably because my theories of the workings of the computer signal circuit are not accurate. I know that is also measures current but in my opinion measuring sensor Miiliamp draw is not necessary in this particular case as I will show in the next upload.

@randy1ization 3 года назад

when troubleshooting my 2000 bmw z3 with key on. the front wheel sensors have 3 wires, and one one wire shows 2.40 vdc, and the other (signal wire) shows nothing when spinning the wheel. the rear sensors have 2 wires, and generate a small a/c voltage when spinning the wheel.. the left side does, but right side doesnt.

@randy1ization 3 года назад

I think my front sensors are active sensors because it has 3 wires and a 2.40 supply voltage from the computer with the key on . when I put my meter on the signal wire with the connector plugged in, via backprobe, and spin the wheel, what voltage should I get ,, does the speed sensor interrupt that 2.40 supply voltage and become an on/off signal to the computer? nothing is happening, and im wondering if my digital VOM cant pick up the dropout voltage?

@ScannerDanner 10 лет назад

In the workings now my friend. Probably in a few weeks.

@danielgromala5084 5 лет назад

mr danner looking for your friends vidio on internals at one time it was posted cant find it use what i have often in class he did an outstanding job on explaining mag res circuit can u direct me to that vidio

@kruno45 10 лет назад

Stupid question I have a ford explorer I'm working on what if a bearing for a passive system was accidentally installed on a active abs system?

@AutoDiag_ Год назад

Would you recommend led test light for sensor bypass wiring integrity and to see live data change? Or it is safe with normal bulb that draws around 120ma.

@ScannerDanner Год назад

On this type of sensor circuit, absolutely.

@anthonybrownsr8764 2 года назад

What type of obd two scanner that show you which wheel speed sensor is bad?

@ScannerDanner 10 лет назад

That is part of it too for sure. I never meant to imply that it wasn't watching the other wheel and other inputs. Sorry about that.

@vicky-nc3to 4 года назад

I am checking a ferrari 575 M, There is a fault related to ABS system, C-1202. I checked all the speed sensor value with tester & come to know that rear right speed sensor value does not changes while driving. Ok it could be a speed sensor problem, but this fault is not getting erased while the car is stopped/ idle. I guess it should be erased while it is ignition on condition. Any idea about that ?

@chromeharris 10 лет назад

Where is the LED test light video, also what size of T-pins do you recommend?

@jorgeboyas2255 6 лет назад

I really like the led test light test for checking to see if the computer is bad. I'm really not that comfortable using the test light to do this test because I really do not think I'm ready to take short cuts just yet and I'd hate my self if I burn out a computer. But I see using a test like and checking for power in the signal wire just eliminates and what a flow chart will tell me to do for checking for continuity at the abs sensor connector and the computer connector. Overall, thank you for the video and keep up the great work with the training for all of us technicians.

@ScannerDanner 6 лет назад

You would really like my chapter 3 material on SD Premium. There is a 14 day free trial and you can subscribe here www.scannerdanner.com/join-scannerdanner-premium.html I think after watching these lectures and case studies you will feel a lot more comfortable with this type of testing. Thanks! Hope to see you there.

@mctobbsi 10 лет назад

If I may add something about voltage drop over resistors. The resistor in the circuit doesn't need to hade a high resistance to do a big voltage drop. Example: 2 resistors, 50 Ohms and 10 Ohms will lead to a 10V drop over the 50 Ohm and 2V over the 10Ohm. The same goes for higher resistance. I.e if we hade a 5KOhm resistor and 1KOhm the drop would be the same as above. The total resistance value in the circuit decides what the drop would be over every resistor.

@Mikesky10 8 лет назад

hi Paul, watching this video, and knowing about tension drops, to do the by pass test for this type of sensor, im guessing that i could also use any high cheap resistor, lets say 700 to 900 ohms, watch the 1.4 v aprox. and generate the signal by touching the wire the same way you did with the LED light; is that correct?????, by that way I LOVE THE BY PASS TEST!!!!!, is awesome, thank you for teaching that test!!!!

@ScannerDanner 8 лет назад

Yep. That should work. Thank you!

@Mikesky10 8 лет назад

ScannerDanner what if i use a triple A battery, the ones that you remote control of your tv uses, connect it directly to the signal wire and do the by_pass test?

@ScannerDanner 8 лет назад

sure, but you'll need to ground the other end of the battery to the car.

@Mikesky10 8 лет назад

ScannerDanner of course!, thank you!; but i wonder, how to do the by pass test in the 2008 commander wss, the one that changes the voltage betwen 10.4v and 10.8 i belive; i have not figure it out how to simulate that small drop in the voltage to test the reaction of the module and test circuit wire!

@4YouWHOyou 7 месяцев назад

Can i do that test with regular test light ?

@Mummyy84 10 лет назад

Paul 26:50 You still could have bad ring in axle(drive shaft) or bad magnetig ring in bearing debending what type it is. OR too big airgap betwean sensor and object that its scaning.

@mctobbsi 10 лет назад

Using the LED test light on another car may not produce the same voltage as on this car because the internal resistor to the computer is probably chosen with care for the specific wheel speed sensor used here. In this particular case the internal resistance of the computer probably ain't that high if we get a about 10V voltage drop with the test light. With that in mind I really would not use a incandescent light on a digital wheel speed senssor system. Someone please correct me if I am wrong.

@lucianoecco1690 5 лет назад

what model of your led light test?

@everardocamacho5063 7 лет назад

Hi paul my Buick regal 2002 3.8 has a abs code c1214, check all fuses they are ok, the abs ligth can be cleared what's the problems thank you paul cheers from ontario ca, I like to watch yours videos

@ScannerDanner 7 лет назад

You need to get your hands on a c1214 flow chart and get a good wiring diagram. My forum would be a good place to start. www.scannerdanner.com

@fivefortyeye540i 10 лет назад

In what cases would this test not be valuable in on a input circuit

@ScannerDannerPremium 10 лет назад

lol on the pintle humped Thanks!

@mikeczuba4349 9 лет назад

this is a hall effect type 2 wire instead of 3 there is a resistor in the module signal side the hall effect changes the current typ. 7 - 14 mA magneto resistive magnet in sensor ferrous reluctor some use the magnetic target wheel looks like a hub seal some sensors are directional detecting 3 hall chips and circuitry in sensor still 2 wire produces three different signals stationary, forward and reverse

@Rex-tf1xm Год назад

Sir Paul where's the link you tell that you saw a video of one from your friends drawing a internal diagram of wss?

@ScannerDanner Год назад

If it's not in the description or comments, I'm not sure

@BlackBlade0001 8 лет назад

Would a Power Probe 3 be safe to use as a LED test light, in place of the one you used for this test? I couldn't find what its input impedance is.

@ScannerDanner 8 лет назад

+Chris C yes, just don't push the button :)

@rogerpatrick3642 5 лет назад

Hey scanner Danner I have a question could you unplug it and provide 12 volts on the other side and then see if the other side has a signal that comes out if so that would tell you if the ABS is good or not yes or no just a question you know more about that than I would

@ScannerDanner 5 лет назад

Not all of the ABS sensors operate like this one, so there is no blanket test you can apply. What I showed on this model may not work on another one.

@gvvq-pi5ml 10 лет назад

Hi Paul I would have called this a Hall effect chip no?, seem to behave like one to me, objectively as one of the other comment said, could have been reluctor or the air gap, always one isn't there :-) , good video all the same.....Fred in England

@JDMCARSCIVIC 2 года назад

How would you test the jeep commander type sensor?

@ScannerDanner 2 года назад

I have a video on a Dodge using this type of sensor, I'm sure it is the same as your Jeep

@gypsysharky 5 лет назад

This did not work, is the computer shutting off bypass signal? i tried on both sides with LED test light and reset fault but no signal??

@AAA-br3cs Год назад

Why not bais voltage on signal line?

@ScannerDanner 10 лет назад

No ground on this sensor Fred. I thought these were hall effects initially too. Did you watch the video that I hyperlinked about these sensors from a fellow RU-vidr?

@kdautomotive1165 5 лет назад

Can you post that link it doesn't pop up as a hyper link for me

@lucianoecco1690 2 года назад

how to test a feed 0v if a short to ground in a pull down design abs sensor thanks

@tharindutest9930 2 года назад

Bad English. Try again.

@mototechno834 3 года назад

Hi Paul..Considering the cars with abs system, does the speedometer work with the help of wheel speed sensors??? I mean are these sensors responsible for the speedometer needle to spin?? Plzzz suggest. Thank you.

@ScannerDanner 3 года назад

Some cars, yes

@slikpik88 8 лет назад

hey SD I plan on buying the book; ebook and hard copy. any deals?

@ScannerDanner 8 лет назад

+Dream_Big for sure, especially if you live in the lower 48 of the US. Outside of this area shipping becomes an issue. Send me an email from my website and I'll give you a quote.

@rontownsend8235 9 лет назад

Like he just said, before it goes to ground. There are all kinds of grounds in these systems,just little wires bolted down to the main body works somewhere,if they are not making a good ground because of years of corrosion then you may have a simple problem there, so take it a part, xclean, dielectic grease and put it back together and move on. Do Not use led test light!

@grzegorz16100 9 лет назад

I wish I could understand. I have to watch it again...

@aliakas1402 3 года назад

how abs controller know abs sensor is faulty the same time the wheel is not turnning around . scanner shows abs sensor code once i put the key on

@HAm-ru8qk Год назад

imo because of lack of small current feeding of bias voltage

@Mummyy84 10 лет назад

You are rigth 0.5v is teached to me be the low volt to pcm know is sensor borck or not. so yeah flat 0v makes it kind asure to be sensor. In realife, i make sure to my go workers, look them anyway to be sure not to only trust meters. because we service all cars and if some year or model sudenly its normal and there is simple ring missing, oh boy they get in "Sauna", if they change sensor anyway ;)