How to test a digital ABS wheel speed sensor
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- čas přidán 4. 08. 2024
- This case study is a good example of how my engine performance testing methods can easily be applied to other areas of the car, giving you confidence during diagnostics! This Chrysler 300 comes equipped with ‘digital’ ABS wheel speed sensors, which differ from conventional variable reluctance sensors, and are becoming more and more common on newer vehicles. Be sure to check the related videos below for more ABS sensor testing info.
Engine Performance Diagnostics chapter 2
Symptoms
- ABS/traction control lights on
- ABS codes 12 and 13 stored
Fix
- replace the right front ABS wheel speed sensor
Tests shown
- using graphed scan data to check for wheel speed sensor function
- using the Snap-On Troubleshooter to learn more about component testing
- how to scope test a digital ABS wheel speed sensor
- how to check if a sensor circuit is pull-up or pull-down by disconnecting the sensor
- how to perform a bypass test (pull-up or pull-down) on a sensor signal circuit
- understanding bypass test variables, including shorted sensors and setting trouble codes
- how to perform a visual inspection on a wheel speed sensor and tone wheel
Tools used
- Autel MS905 MaxiSys Mini Diagnostic System with Connector Kit - USA Version
www.jbtoolsales.com/autel-ms9...
- PicoScope 4425 4 Channel Standard Diagnostic Kit
www.aeswave.com/cart.php?m=aff...
- incandescent test light
www.jbtoolsales.com/otc-3633-...
Playlist
- ABS Wheel Speed Sensor and System Testing
• ABS Wheel Speed Sensor...
Related videos
- How to test a digital ABS wheel speed sensor - 08 Chrysler,Dodge,Jeep
• How to test a digital ...
- Magneto Resistive ABS Wheel Speed Sensor Test - 2006 GM
• Magneto Resistive ABS ...
- ABS activates on every stop - damaged tone ring
• ABS activates on every...
- How to test an ABS Wheel Speed Sensor (VRS type)
• How to test an ABS Whe...
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. - Auta a dopravní prostředky
For those who are concerned about running higher voltage to low-voltage circuits (like in this video), I have one question for you: When you open the fuse box in your car, do you have 10 volt fuses, 5 volt fuses? No. It's the amperage that burns the circuits, and since the test light has a limited current drawing bulb in it (I think the one he mainly uses, doesn't draw more than 200mA), there isn't enough amperage flow through the system to cause damage.
Great explanation of the test procedure. My wife came home tonight from work and told me the abs/vdc light came on just before she got home. I'm going to the downstairs to the garage now ;-)
I think you are correct. This is not a "hall effect" design. Mitchell-On Demand describes this as an active wheel speed sensor with an integrated circuit inside the sensor. There is also mention that the computer looks for current and voltage changes on the signal wire
Had a same type of faulty sensor on Fiat Stilo 2002. Your video helped me a lot, I'm used to those inductive, classic abs sensors. Thanks, best wishes from Serbia. :))
Your videos are great, learned a whole lot in just 2 videos. Will definitely subscibe and follow!
Excellent tutorial. Well done. Very informative. Thank you for posting.
Great video Paul. A lot of great information.
Whenever I get an email notifying me of a new scannerdanner video I get quite excited!! No, I've not got a sad life (well, ....). As usual brilliant Paul. You must seriously enjoy your job.
awesome video Paul , I learn something new from each your video, thanks for sharing ..
never thought of bypassing the signal wire .. good info!!!
there are lots of different people showing how to videos but they dont give any depth of understanding and that can create room for error.you have this down to a science. the material is so packed with information and reviews are a must to get it into memory.your book is the greatest in my collection. keep it up this is better than dealership training. i like field videos without schematics because it show how to real time diag. great video
thank you so much!
@@ScannerDanner sir, my car i20 has 2 wire speed sensor.
If I drive constant speed 40 kmph or above, will the output signal of the speed sensor remain 5 v?? How this value is proportionate to the rotation of the wheel? For eg, 1 pulse per 5 revolution??
@@tnamen1307 it is a pulsed signal and the pulses are counted by the computer, so it is a variable frequency signal
@@ScannerDanner is there any frequency to voltage converter module for giving out a constant output voltage say 5 or 12 v from the pulsating input signal?
Fantastic Presentation. Totally Awesome!!!
It's a well learned lesson. Don't forget the basics. And I'm glad I learned this hard lesson on my car at home and not on a customers car.
I graduate from UTI Sacramento next August and from there hope to do a manufacturer specific advanced training. I try to watch at least one of your videos a day. I have learned so much! I can't wait to get your book when I get some extra dough. Don't feel bad for laughing. I laughed too.
good way to explain the pull up,pull down design sensor type voltages, good to know thet way you can bypass pretty much any type of sensor to check the circuit going to the pcm..goo video Paul
watch the video response from one of my friends here. He does an excellent job and will answer your question
Nice video man thanks!
Good test,., thanks,. Paul,
Very Nice Video Mr.DannerScanner
For those, like me, that dread the idea of pumping 12v into an ECM there is the Voltage-gate. It uses a 12 ohm and 3 ohm resister to pull the voltage down to 3 volts. Ask any electrical guy and they'll build you one.
Yep, this channel has what I needed, I kid you not some youtube guy Scotty Kilmer said to, ignore and or take out the ABS fuse.. I kid you not...
Not surprised by that. Thanks for watching!
thank you!
RJ
I am still laughing. I am so sorry for your trouble my friend. It really is kind of funny though isn't it? I feel bad for laughing
Very interesting.
Thanks Hank!
It is such a valuable tool, isn't it? I am always looking for ways to "create a signal and look for a response"
Speed and accuracy is what this type of testing provides. Don't you think?
Good question Malisa!
I wonder if the maxidas could check the speed sensor like the verus does. I like that graphing you have.
Hi Paul. I have a question regarding wheel sensor with hall effect. Some European cars have wheel sensor but instead of the gear ring who make the square wave, they have a magnet ring (north, south pole) which makes digital waveforms when it turns. And it is difficult to determine is it the sensor faulty or the magnetic ring. I had a case study where the magnetic ring was faulty and I did not how to check it unless I switched sensors from left to right and check it again on scan tool. Thanks!!
use at least a 5k ohm resistor. this will protect the reference circuit from an accidental short to ground. doesn't matter resistor size as there will be no measurable amount of current flow so heat is a non issue
i do thanks Andy
Will a resistance check work on this type of sensor?
This is better information that the factory service manual. The manual only shows to check for feed voltage, shorts to ground and resistance continuity tests. No mention of the wave type the sensor creates and how it should look like on a scope.
So, I looked at my car the other day and noticed that I didn't have an ABS light illuminated during the bulb check when first turning the key ignition on. I decided I was going to find the problem ensuring that all the wiring was sound and that the bulb was in fact the source of the problem. I was inspired by Mr. Danner. I did a ton of research, found wiring diagrams for my car and after completely tearing the dash apart, I found out why the ABS light didn't work...
I don't have ABS! :(
🤣🤣
What is the difference between hall sensors and magneto-resistive sensors ?
Which kind of sensors are used in ABS and what are the components in the sensor?
to free 4 jumpin, if a signal wire unplugged has no voltage what is the only thing that can possibly effect it ? pulling it up because something at rest stays at rest until it is moved, voltage is the push it needs. when it is plugged in pulling it down is just resistance needed to get current to move.get the book. read it everyday until it becomes like breathing.this stuff doesnt come easy for me, all things are possible. good luck i wish all the best to you.
Could you have just closed the gap with something steal and see if the sensor responded and sent a signal? Prior to removing it. Would that confirm whether your sensor was operating correctly and the air gap was for sure the only cause?
it was on a Ford 4-wire MAF sensor. recent video. i think it was on Taurus
Dan, What do i have to do if my power wires to both front sensors don't show battery voltage however the rear sensor does. It is a 2006 F-250. I have proven to have good wiring to and from the sensors. I'm thinking I need to replace the ABS module. Thank you.
I am directing all help requests to my forum. Sign up (it's free) and create a new post. Be sure to add a name under "alias" as this is the name that will appear in the post.
Here is the link to the forum.
www.scannerdanner.com/ForumRetrieve.aspx?ForumID=3226
what is the scan tool u use?
Thank you Mr. Danner. I just wanna know if there is a difference between haul effect sensor and magnito resistance sensor? I think you showed, in this awesome video, the magnito resistance sensor not the haul effect one. And I also think that the magnito resistance sensor does not need ground connection. Thank you again. I'm waiting for new videos.
what would it be the resistor value PAUL? and the resistor should be a 1/2" 1/4" 1/8" size?
did i label the title wrong in the video? sorry for the confusion
How do I check tone ring on drum brakes?
wouldn't back probing a hermetic connector possibly cause problems down the line by compromising the seals? Are there any other methods to tap in to the signals?
when you work in the aftermarket like I do and are dealing with 40 different manufacturers, there is no better way than to backprobe a connector. I do not have the option of having hundreds of different breakout type test connectors, not to mention where to actually buy them
Nice Video, Paul. Thanks for posting paper version in Aeswave.. I know u did a bypass test with resistor bridging 5V reference. do u know which video is that so I can search in ur site.. thanks..
What happens when you have those same dash lights on that you mentioned, but no engine codes showing up on a code reader? =/
What same dash lights? Help me out a little, this is an older video.
You have 10,6 volt at the speed sensor connector I guess there is a voltage drop through the resistor in the computer, because you got a small current flow through the sensor, at the computer there might be 12,6 volt. If you have a open in the signal wire would you have 12,6 volt at the sensor connector since there is no current flow?
thnx
that's a huge gap, unfortunately I'm working on a 01 passat. and it seems that the sensor is not visible for inspection.. will get back with my results.
well it is and after installing a new cv axle, the sensor got bumped and had too big of a air gap. these sensors push in with your fingers and can be knocked out of alignment, my guess by hitting a bump. SO if you have a ABS light on your pos VW. I would check all of the sensors to make sure they are all clean and seated, before you spend BIG money on a ABS module. thanks for the info SD it was a big help locating my problem with my customers car !.. Jay
can you tell me what scanner brand and model you are using i have a cheap 400.00 dollar one ok really not cheap but i know the one you have is a few thousand
when you went around spinning all the wheels you:
spun left front: got voltage fom its sensor
spun left rear: got voltage from its sensor
spun right rear: got voltage form its sensor
spun right front: GOT VOLTAGE FROM LEFT FRONT??????? AND NOTHING FROM THE RIGHT, is this because of a differential?
yep, good eye. It was because of the front differential. When you spin one of the fronts, the other spins as well
there must be a resistor in line in the signal wire.
Can you do this test with multimeter?
no, well, maybe? On an AC scale you'd see those small variations?
isnt that a magnetive resistive speed sensor?
Hello. Hyundai Sonata 2015 Hybrid. RR speed sensor code on scanner. From drawing it is an active magnetosensitive sensor. But when checking the supply voltage there 0V. I check it on LR one which is known to be good and there also 0V.
Please explain where I am making a mistake?
if you have 0v on both ABS WSS wires and one is a known good and the other is a known bad, then you are not dealing with an active sensor, it would be a VRS (variable reluctance sensor) that creates its own voltage
@@ScannerDanner but as per drawing one of the pins VCC other one SIG. Maybe WSS activates on D gear?
@Elchin206 you have known good sensors on the other 3 wheels that you know can create the proper signals. If you're not able to measure them, you're not testing them correctly.
It still could be an AC signal regardless of those designations
@@ScannerDanner measuring method from you book and videos😉(battery negativ and by one by backprobing wires) .
I will check for VRS. If it is AC type then drawing is ....
@Elchin206 awesome, thank you!
did test light blink? while u bypass ground to stuck 1.6v signal wire!
+Raju Yadav I don't think so, I was touching the light on and off the circuit to create a signal to the EBCM
i am thinking that does 1.6v can not blink test light? or 1.6v was bias volt? sorysir my english is not verygood
+Raju Yadav no problem, you are doing very well with your English. Any test I did with the test light was not about what the light was doing, it was about substituting a signal to the computer to test the wiring. Without watching this video again, I'm not sure exactly what your question is. can you give me a specific time frame in the video?
video 11:45 to 12:27 i am taking my question back about bias volt. obviously there 1.6 volt should not be a bias voltage. my only question is. can that signal wire with 1.6 volt blink test light? and i understand the way you use test light for check signal wire and driver. u touched test light(which was connected to ground) on off to signal wire to see tire speed on scanner.we saw tire speed on scanner that means driver and wiring is good.there was a faulty sensor.i am explaining this all beacause i want to show you that i am learning under your teaching.your teaching is very good.and my favourite is when you use sketch for teaching. that is very easy for understand .thank you sir :)
+Raju Yadav ah okay. Good question. The answer is no. 1.6 volts would not be enough to light a test light bulb. Even and LED type light would not light up with that low of voltage.
Thanks so much my friend. And I can see that you are really doing well in understanding even though this is not your native language! Awesome
@mrjost55 The Chrysler 300 didn't go rear wheel drive until 2005
Dude where's your shop? I need help...lol
Actually The LH cars like the intrepid and the top line 300 were fwd! the LX cars were the rear and all wheel drive platfrom!
Another thin you can do is make yourself a tool using a 5v regulator which has three leggs on it one to power of the Battery(CALLED IN) one to Battery earth(CALLED GROUND) and then one to the 5v (CALLED OUT) which you can use to signal the computer googel 5v regulator to see which pins go where
Unfortunately I don't think that sensor could be saved. Looks badly corroded on that hub
Thank man. See my comment to Hank Williams. See if you agree
Hey Paul, are you sure this was a Chrysler 300? Reason I say this is because they are RWD, not FWD.
Nvm, I rewatched the beginning and realized that you had a 300M.
You won't get a signal if the sensor is loose because they ground through the hub. You can also test these using an ohm meter and spinning the wheel.
wouldn't this be a 300M?
Are you a mechanic or a electrical engineer.
+Ishtiaq Ahmed haha, just a mechanic, but I've been teaching for over 15 years at a college, so I've spent a lot of time analyzing stuff and over complicating things too :)
probably a 300M not a 300C
👨🏼🔧🦾👏🏻👏🏻
200$ speed sensor!!!!???? aint nobody got money fo that!!!
Christ! I diagnosed and replaced a sensor in less time than this video. $ 25 for a sensor
you should start doing videos then since you're so awesome!