How to Troubleshoot ABS on a Tractor Trailer
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- Опубликовано: 29 мар 2017
- If you understand how the ABS system works on Tractor Trailer units it makes it a lot easier to find and fix faults.
**I mentioned in the video that I thought the blink codes were the same from bendix to wabco, they are not the same. The links below will give you the proper blink codes for each system**
Meritor Wabco Blink Code Diagnostic guide
www.meritorwabco.com/MeritorWA...
Blink codes for bendix, meritor wabco and haldex
ipatools.com/media/Manuals/ABS...
Trailer Teck light and brake tester
redtech.ca/brochures/brochure_...
Here is a good resource on how the air brake system works
www.free-ed.net/sweethaven/Mec...
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Disclaimer: This video is for information only, do not attempt any repairs unless you are properly trained and competent. 
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I mentioned in the video that I thought the codes were the same between bendix and wabco. They are not the same. I provided links to the blink codes in the description.
How to put on abs-tractor abs valve
+Donald Kirven take a few pictures of the old one before you take it off. Then you can reference your pictures when you install the new one. I also like to use colored zip ties to mark the position of each air line and abs wire. Don't forget to use thread sealant on all NPT fittings. (pipe thread) Check to make sure you don't have any air leaks, and make sure all your brakes are applying and releasing properly before you take it for a test drive.
Depending on the abs valve it may need to be programmed when you install it. Usually if your truck has a stability control system. So you'll need a computer with the right adapter and the diagnostic program from the manufacturer of your abs valve if that's the case. (Probably better to take it to a shop if you don't know) Hope that helps.
I habe a question mecanics are always too busy..everytime I hit the brake abs locks for like 11 secounds...please help
On trailer
@@TheHDPerspective My friend, im having an issue with abs that even the dealer cant find the problem. What is going on is that the dash Tractor and trailer Abs light comes on when i start the truck and will go up after driving a few minutes (like 10 Minutes) NO CODES! Dealer replace my abs ecu! Still same problem. All started when dealer replace my egr sensor. Have you had any similar problem? Thanks in advance
The most comprehensive video on ABS I’ve seen so far. Thank you
Glad I could help
I too thought this was a very good video but, he did not mention any info about the hubs/tone rings other than their existence. They also perform a crucial function in the abs system.
If you do all these steps and the trailer comes back due to an intermittent abs malfunction, you may have bad hubs.
I have been seeing more trailers with intermittent abs faults that make no sense and have found hubs with corroded teeth sufficient for the system to malfunction.
Perhaps only a few teeth will be corroded an pointed in shape instead of square etc.
You have to inspect all of the components.
I really appreciate this information. You really explained and demonstrated how easy it is to troubleshoot the abs system. 💯💯
The best video on ABS so far, You are awesome. Thank you
Great informational video. I just found your channel and subscribed. Looking forward to seeing more videos. Thank you.
Great explanation of abs system..
*Very informative video*
Expand very well brother. Thanks 👍
just found your channel and subscribed. i hope to see more of your repair videos!
+J.C. SMITH PROJECTS thanks for watching!
The is by far the best video I've ever seen
Hello, saludos desde panamá, excelente video, muy útil, gracias. Bendiciones
Good video, i fixed my abs light from after watching your video. Thanks
Awesome!
Great job on the video👍🏻
Wow excellent video and explained thanks you so much for your information , 👌👍👍
Great info, clear, and concise. Thanks!
Glad I could help
Thank you very much I found the information very useful
Great video. Thanks for sharing some knowledge.
+Reid Sherman my pleasure, hopefully it's helpful
I think you for the informative video you explain things very well in logical order.
Thanks for watching
Great work. Thanks for the help!
I have a fault code indicating: hold solenoid shorted or open, any idea what this might be? Any suggestions would help. Thank you
Fine video. Very informative.
Glad you liked it!
thanks for the info bud i will keep up with your channel looks like we are in the same kinda line of work.
Right on, thanks for watching
Good stuff. I just found your channel and subscribed. Your point was great about color ties on the ABS wires. On our '02 KW's both wires to the wheel sensor are black! So, on a polarity sensitive system, how's a guy to know which is which unless, it's marked. When a tire chain comes loose and breaks the connection, there's a 50/50 chance to get it right the first time.
+Chad Jessup thanks for watching! I'm working on more videos so stay tuned
Thank you so much to share this video 👍
Great video.
Thanks for your info.
Bro u rock you just made my job 100,000,000 easier
Lol, glad I could help.
What would cause the ABS light on the trailer to not cycle during the self test? I’ve replace the bad light on the trailer and a bad relay on the truck.
Great video!!!
Thanks can use all the help I can get
+Derek Hellam glad I could help
thanks man you taught me something
+mike cole glad I could help!
Hello.
Freightliner Cascadia 2016.
Tractor ABS light on.
The truck won't start.
I don't have a check engine light on the dashboard only the ABS light on.
If you guys know something about this can help me.
Appreciate it.
Great information, thanks for sharing
thanks for watching!
Hello. I need help please. I have 2007 Vanguard trailer. I have 5 volts on the module, wires right before sensor 5volts. Sensor wire 1200 resistance when set on ohms, both wheels. Lift up both wheel spin the wheels there
is consistency and i still get the yellow light, new green cable that connects truck and trailer but i know that the truck is not issue cause i have other two trailer and i never get the abs light on This issue is driving me crazy. What could be the problem that triggers the abs light to come on ? Yellow light blinks 6 and repeats that for three times
The ABS light was not doing that until I had mentioned it to you the other day . It is not recommended to drive with that ABS light on . The DOT will shut the truck down until it is fixed . I just checked on that
Here’s my issue, would appreciate your thought on it;
Bought a used 2016 trailer. Plug into and ABS and it does the normal test procedure and light turns on then off
Driving on snow/ice roads and making a harder brake application, the trailer locks up without any abs function. Abs light does not come on.
I have power at the center pin and to the abs module. Brought it back to the dealer for repair any they handed it back saying abs functioned fine and no stored fault codes. They cleaned connections and sent me on my way. Next snow storm I tested the brakes and of course no abs. Any ideas or past experience with something like this?
It's hard to say without being there, but if all the wheels with the sensors lock up at the same time, the system will just think the trailer is parked. It works by comparing the wheel speeds to each other and if they're all the same, then the abs system won't activate. That could be a possible explanation. Especially if you only have 2 wheel speed sensors for a multi axle trailer. Trailers that have a sensor on each wheel are less likely to suffer from this problem. Hopefully that makes sense.
Fun video. Hope I can remember when I need it.
The beauty is you can always come and watch it again. Glad you learned something.
..enhemm,shall we say a smart answer for not so smart opinion?
Good information thanks
Great video. The shop I work at part time the one guy uses a vantage pro
+GREG Feeney is that a light cart or a scan tool?
Dif 1 asr valve fault. Any ideas what it means?
Thanks I will try this on my trailer
My abs light don't come on when I turn the key to on or turn the semi truck on. I just changed the pigtail wire and a brand new round abs light, and still not working. What can it be? Do I test the wire for current? And if there is no current then what?
My abs for the truck is on
It initially powers on does self test fine. I drive down the road and could be 5mins or a couple hrs. It comes on. And my cruise control won't set the speed. Only if I'm lucky it will set after 30 times of hitting the button. Please help?
Probably have an abs wire that's corroded some place.
I have an abs light that WONT turn on during MUT test. I traced wires and basically found power was going to abs module but no power out to the light from module. What tests can I perform for that?
If there’s no power coming out of the module. You either have a bad ground or the module is no good.
Thank you 🙏🏻
hi Dillon what if you have 1700 ohms resistance instead of 1100 ohms. is that sensor still bad?
+Florentino Balandrano I would compare it to the other ones if they're all 1700 then I'd say you're good. Some sensors from different manufactures can be a bit higher. But if only one is 1700 and the rest are 1200 then I would change that one sensor.
Great 👍🏽! 👏🏾👏🏾👏🏾 Thanks you very much!!!
Glad I could help
great video
+nauman malik thanks for watching and subscribing!
I have a trailer that the light will come on sometimes after making a very sharp turn. It goes off after a key cycle.
But i will get the 5 flashes on 1st key cycle
I would start by looking at the plug on the trailer cord. It might be getting worn out.
My Stoughton trailer has ABS illuminated and when I shut my truck off and apply the truck brake ( yellow on dash). And start rolling the light goes away and comes back on 10 miles or so down the road and have to shut down and roll again. Dealership that sold me trailer can’t seem to find the issue. Really frustrating.
Do you know what kind of abs module is on it?
I hope you read the comments because I can really use some input on a problem I'm have with the exact same system as you test in this video.
My problem is the valve boots up correctly and tests good. No blink codes, the problem is the abs indicator light stays on all the time and wabco has been no help in aiding me. I figured the valve is what controls the abs light shut off so I replaced the valve with a new one and I have the same problem so it's not the valve. I cant track the indicator hot wire because it goes into the harness at a rubber block junction that runs to the front of the trailer and down to the valve. Inside the harness it's just standard 7 way. I need to know some common problems and what color wire coming out of the valve goes to the indicator light please? Hope you can help with this.
What happens when you use a different truck?
@@TheHDPerspective it's the same with any truck or my light box tester.
Hey bud! I really enjoyed your video... what do you think it would be when I turn the ignition on the abs light does NOT come on, but it will when I press the breaks when driving, it would come on for few seconds then go off even if I still have my foot on the brakes??? Please help I’m driving 2016 Pete 389 car carrier
Is this just on the trailer or the truck? If it's just the trailer you probably don't have power going to the abs module on the blue wire or centre pin on the light plug. Check to make sure you have power going through the plug. You can try spreading the pins a I little bit with a small screw driver on the trailer side of the plug to get a better contact, but be careful not to break them. You'll need to isolate between the truck and trailer. If it's the truck it's likely the same thing. Could be something as simple as a fuse. Or could be broken wire. Good luck!
The HD Perspective this is just on the trailer
I have the same issue where u able to figure out what was wrong with it
Andy I yes I did figure it out... the power was getting lost at the pig tail, all the wires got corroded where they hook up to the back of pig tail box , I just cleaned them up a bit , got a new box hooked it all up, and done.... the box was like $20 the Phillips aluminum one.... best of luck to you...
@@andreypanchelyuga7078 was it on trailer side or truck side
Thanks
So the sensor has to actually rub the tone ring for it to work ????
will haldex abs sensor work with bendix abs system and vice versa?
Yes
I have 07 freightliner century class automatic transmission. I have 2 codes 1- 130 231 14 which is transmission reservice code. 2- 136 231 09 Brake update code . When i checked it it says j1939 not communicating. These 2 codes shows up on usually rainy days but it goes on and off and no one can figure it out. When the codes comes transmission doesnt shift. It kills me. NO ONE COULD FIND IT because when you stop code goes away. Any ideas ?
J1939 codes can be hard ones to find. If it’s coming on when it rains I would say it’s in one of the connectors for the harness that is missing the little rubber seal somewhere. Sounds like a harness issue. That’s where I would start.
great video, i have a costumer w a freighliner and a dry box trailer abs light is on the dash, i hook up my laptop and gives me no codes or perhaps no communication any advice?
Can you get blink codes?
The HD Perspective i
just found the blue wire that goes to the abs module damaged!!! thanks for quick responce
The HD Perspective fixed the wire it still wont communicate
The HD Perspective cant get the trailer abs light to blink either
Glad you found the problem!
Is it possible that faulty ABS makes one wheel to lock when applying brakes
Not likely, probably have a sticking s cam or broken return spring in the brake pot. Something like that
I did what you said I get 5 DC volt an 1200 oms but light still on what can it be
Could be the abs module itself, but without being there to see I can't say 100%
What causes the abs light to turn on when applying the brakes?
You likely don't have power going down the center wire on your plug. Either on the plug or somewhere in between the tractor and the abs module on the trailer.
Why my abs light doesn't come on when I turn the key on, but will turn on when I brake and stays on if i keep my foot on the brake, it turns off when I let off the brake? Please help, thanks.
+Tarzanovich is this on the truck or trailer?
2005 Great Dane 53ft reefer trailer.
+Tarzanovich what happens when you turn your hotline switch on, in the truck?
I have a 98 freightliner fld truck, I didn't turn The switch on and don't know where it is .
+Tarzanovich it seems to me that you don't have power going to the center pin on your light cord, you should see 12 volts there.
Push on brake pedal and no light comes on for a b s. Tested the light, the light is good. Even put on new light. On trailer.
I have the issue of abs light comes on and it errors my meritor webco onguard system which then puts my truck into manual transmission. Driving a 17 freightliner cascadia. Some trailers it works fine on and others it errors out. But when trailer is unhooked truck works great. I think the problems is what this guy talks about in this video. Ive had the onguard system replaced. Any ideas?
Sounds like a tricky problem. I'd need to take a look to figure it out. But I'd probably start with the trailer cord, it's possible the plug is just on the verge of being worn out and your not making good contact with every trailer.
What do I do when ABS box is 5 volts both lines are 5 volts and both sensors are 1.22 and the light still won't go off ?
Do you have blink codes?
@@TheHDPerspective It blinks six times so i'm assuming the sensor is not within the 40 thou tolerance
Did you check the tone ring it could be bent or a tooth missing or cracked?
So if i get 1800 ohms in one sensor that means its bad
DAM good video thank you..
Very helpful thanks! 👍🏾🫡
I have to replace the ecu constantly. Maybe haledex isn’t as reliable.
Usually they are pretty solid
What if im getting 10volts at the module?
Definitely not good
Wish you where in Tampa, fl😡
Lol I wish I was too! It's freezing here!
What if you just get a light that says j1939 abs failure on your dash under faults and no abs light for tractor or trailer? where do you start.
You would likely need the OEM program to scan the abs module and go from there
@@TheHDPerspective Theres no signal to the module. I need to work backwards to the module. All have is the truck diagnostics abs failure j1939. The computer cant find the module or abs system.
It's usually a blue wire that transfers the data. It's the centre pin on the plug.
I have the same problem on t660 no ignition cycle, no abs light but same j1939 abs failure code. Did you fixed it?
Awesome video.
+A O thanks for watching
hhhmmm, good info
I’m just a regional company class A driver who’s tired of shops like loves not knowing how to diagnose trailer ABS problems so... here i am I guess
Guess ill do it myself 🤷🏾♂️
If you want it done right, you got to do it yourself.
Your working on a wabco
Ya, that's the most common system
Hit me up if u need help in central Florida
Once you told I need a machine like that to put air , l switched to a different video.
You don't need it but it makes life a lot easier
Can I borrow your cart?
Sorry I don't have one anymore. Work on heavy equipment now so no more trucks and trailers for now
Where u located
Alberta
Thank you