check abs sensors
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Joined: Jan 2007
Posts: 12
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check abs sensors
C200 -98 classic AUT 280000km
I have a problem with my abs/asr lights being constantly on and the systems not working. Both lights are on immediate after start and always stay on. The lights used to go out before, randomly, but now they are always on.
I have checked fuses, changed the break pedal switch and cleaned both front sensors. Did not find any sensors at the rear wheels so I suppose there is one sensor on the axle for both.
the rpm and km/h meters work fine = the sensor on the rear wheels is ok?
1. the cruize control does not work
2. the kickdown does not work (yes im sure this is the reason, it worked fine whenever the lights would go off.. it shifts down when i press the pedal, but when it reaches high rpm it doesn't shift up)
3. and now after me "cleaning" the sensors (using wd-40 electric cleaning compound) the doors don't automatically lock above 10km/h (they did prior cleaning, even though the cruize, kickdown didn't)
does these symptoms point to a abs sensor? do they point to a specifik, ie the front left?
also read that you can check with a multimeter if the sensor is working correctly by reading the resistance. But where would you connect the multimeter since it is a enclosed system as far as I can see? Included two pictures.
http://public.openmindedprojects.com...sor_Givare.jpg
http://public.openmindedprojects.com...or_Kontakt.jpg
I have a problem with my abs/asr lights being constantly on and the systems not working. Both lights are on immediate after start and always stay on. The lights used to go out before, randomly, but now they are always on.
I have checked fuses, changed the break pedal switch and cleaned both front sensors. Did not find any sensors at the rear wheels so I suppose there is one sensor on the axle for both.
the rpm and km/h meters work fine = the sensor on the rear wheels is ok?
1. the cruize control does not work
2. the kickdown does not work (yes im sure this is the reason, it worked fine whenever the lights would go off.. it shifts down when i press the pedal, but when it reaches high rpm it doesn't shift up)
3. and now after me "cleaning" the sensors (using wd-40 electric cleaning compound) the doors don't automatically lock above 10km/h (they did prior cleaning, even though the cruize, kickdown didn't)
does these symptoms point to a abs sensor? do they point to a specifik, ie the front left?
also read that you can check with a multimeter if the sensor is working correctly by reading the resistance. But where would you connect the multimeter since it is a enclosed system as far as I can see? Included two pictures.
http://public.openmindedprojects.com...sor_Givare.jpg
http://public.openmindedprojects.com...or_Kontakt.jpg
Last edited by noShame; Apr 1, 2009 at 03:19 PM.
Newbie
Joined: Mar 2009
Posts: 2
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C180K C240T
ABS light on
I have a similar problem.
Only that I am still in the intermittent stage. Sometimes they both go on and randomly goes off.
No-one seemed to have a clue.
When it was connected to the computer it mentioned something about right rear. So your guess that the rear one is playing up may be similar.
By the way WD-40 is not inert. When there is a wet film between contacts, it will short it. Try Inox or others that is non-conductive.
C240-1997
Only that I am still in the intermittent stage. Sometimes they both go on and randomly goes off.
No-one seemed to have a clue.
When it was connected to the computer it mentioned something about right rear. So your guess that the rear one is playing up may be similar.
By the way WD-40 is not inert. When there is a wet film between contacts, it will short it. Try Inox or others that is non-conductive.
C240-1997
Thread Starter
Newbie
Joined: Jan 2007
Posts: 12
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Hm ok.. I have heard that the cable, due to twisting and turning (front wheels) could be broken, and get contact / loose contact as you hit bumps and turn the wheels.
Try measuring the resistance over the sensors using a ohm meter to see if the values vary much. I did that and discovered that both my front right and rear sensors gave a reading of 1020 ohms but my front left gave no reading at all. So my front sensor or wiring is broken and I will buy a new one for replacement, holding my fingers crossed that this was the only problem
Try measuring the resistance over the sensors using a ohm meter to see if the values vary much. I did that and discovered that both my front right and rear sensors gave a reading of 1020 ohms but my front left gave no reading at all. So my front sensor or wiring is broken and I will buy a new one for replacement, holding my fingers crossed that this was the only problem
Thread Starter
Newbie
Joined: Jan 2007
Posts: 12
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Changed to a new front left sensor today, but no luck :\
The ABS/ASR lights are still on, do you need to reset it in some way (turning wheel left-right), disconnecting battery?
The thing is, now the doors lock automatically when >10km/h after the sensor change.. Where do I go from here?
The ABS/ASR lights are still on, do you need to reset it in some way (turning wheel left-right), disconnecting battery?
The thing is, now the doors lock automatically when >10km/h after the sensor change.. Where do I go from here?
Thread Starter
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Joined: Jan 2007
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Read that models prior -98 only have one sensor on the rear but that models onward have two sensors, one on each wheel. I jacked up the car and discovered that mine sure enough has two sensors, they were hiding behind the heat shield on the wheel so I didn't see them the first time around.
Did a ohm reading, the left gave a reading of 1050ohms which was close to the readings of the front wheels but the right one was dead giving no reading at all. Cut the cord and tested it, had contact.. so it wasn't the cord but the sensor body. Will buy a new sensor tomorrow and fit it holding my thumbs.. ill keep you posted on the progress!
Btw, looking at the homepage of a local dealer there are three different sensors based on chassis number, but all of them are "no ASR". Does this mean that ill have to buy it from expensive MB?
Did a ohm reading, the left gave a reading of 1050ohms which was close to the readings of the front wheels but the right one was dead giving no reading at all. Cut the cord and tested it, had contact.. so it wasn't the cord but the sensor body. Will buy a new sensor tomorrow and fit it holding my thumbs.. ill keep you posted on the progress!
Btw, looking at the homepage of a local dealer there are three different sensors based on chassis number, but all of them are "no ASR". Does this mean that ill have to buy it from expensive MB?
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Thread Starter
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Success! I changed the right rear sensor today and started the car, the lights were on. I drove 20~ meters, still on. I drove a couple of meters more and did a hard break to stress the system, the lights went out and I felt the pedal pumping! Now the cruise control is working, the kick down is working perfectly, antispinn is working, pressing the ASR off button turns it off. Everything is working great again!
I want to thank everybody for helping me solve this!
Info below is for future reference when people are searching_____
keywords: abs, asr, sensor, kickdown, cruise control, break pedal switch, w202, ate
w202 C200 -98 280000km
Measured resistance on front sensors: ~1100 ohms
Measured resistance on rear sensors: ~1060 ohms
Model year 98 onward, two rear sensors behind the heatshield,
models prior 98 one rear sensor on the rear axle.
part numbers for my sensors
front left: a 202 540 23 17 (ate)
rear right: a 202 540 28 17 (ate)
I came to the conclusion that the door locking function when speed >10km/h is controlled by the front left sensor. Also my kick down function and cruise control did not function correctly/at all while I had a problem with the ABS system/sensors. This could be of some help to someone having problems with kick down/cruise and dirty/faulty sensors.
Again, thanks for the help guys - anybody having problems/help ask and I will do my best to help you.
I want to thank everybody for helping me solve this!
Info below is for future reference when people are searching_____
keywords: abs, asr, sensor, kickdown, cruise control, break pedal switch, w202, ate
w202 C200 -98 280000km
Measured resistance on front sensors: ~1100 ohms
Measured resistance on rear sensors: ~1060 ohms
Model year 98 onward, two rear sensors behind the heatshield,
models prior 98 one rear sensor on the rear axle.
part numbers for my sensors
front left: a 202 540 23 17 (ate)
rear right: a 202 540 28 17 (ate)
I came to the conclusion that the door locking function when speed >10km/h is controlled by the front left sensor. Also my kick down function and cruise control did not function correctly/at all while I had a problem with the ABS system/sensors. This could be of some help to someone having problems with kick down/cruise and dirty/faulty sensors.
Again, thanks for the help guys - anybody having problems/help ask and I will do my best to help you.
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Newbie
Joined: Jul 2010
Posts: 2
Likes: 0
C200
c200 1997 ABS light on-gear stuck in D.
Success! I changed the right rear sensor today and started the car, the lights were on. I drove 20~ meters, still on. I drove a couple of meters more and did a hard break to stress the system, the lights went out and I felt the pedal pumping! Now the cruise control is working, the kick down is working perfectly, antispinn is working, pressing the ASR off button turns it off. Everything is working great again!
I want to thank everybody for helping me solve this!
Info below is for future reference when people are searching_____
keywords: abs, asr, sensor, kickdown, cruise control, break pedal switch, w202, ate
w202 C200 -98 280000km
Measured resistance on front sensors: ~1100 ohms
Measured resistance on rear sensors: ~1060 ohms
Model year 98 onward, two rear sensors behind the heatshield,
models prior 98 one rear sensor on the rear axle.
part numbers for my sensors
front left: a 202 540 23 17 (ate)
rear right: a 202 540 28 17 (ate)
I came to the conclusion that the door locking function when speed >10km/h is controlled by the front left sensor. Also my kick down function and cruise control did not function correctly/at all while I had a problem with the ABS system/sensors. This could be of some help to someone having problems with kick down/cruise and dirty/faulty sensors.
Again, thanks for the help guys - anybody having problems/help ask and I will do my best to help you.
I want to thank everybody for helping me solve this!
Info below is for future reference when people are searching_____
keywords: abs, asr, sensor, kickdown, cruise control, break pedal switch, w202, ate
w202 C200 -98 280000km
Measured resistance on front sensors: ~1100 ohms
Measured resistance on rear sensors: ~1060 ohms
Model year 98 onward, two rear sensors behind the heatshield,
models prior 98 one rear sensor on the rear axle.
part numbers for my sensors
front left: a 202 540 23 17 (ate)
rear right: a 202 540 28 17 (ate)
I came to the conclusion that the door locking function when speed >10km/h is controlled by the front left sensor. Also my kick down function and cruise control did not function correctly/at all while I had a problem with the ABS system/sensors. This could be of some help to someone having problems with kick down/cruise and dirty/faulty sensors.
Again, thanks for the help guys - anybody having problems/help ask and I will do my best to help you.
MB newbie here,
noShame; Do u think that each sensor has a specific reaction when it comes to altering the car systems?? My c200 1997 auto has the ABS light popping on randomly and when it's on my car is stuck in D-gear and refuses to shift
. when i switch off the engine sometimes and wait for 30mins and start the engine, it sometimes behaves and no ABS light and cruising is smooth with all my auto-transmission workin OK
. Please get back to me with this info as i go buy a multimeter.
does 97' c200 hav cruise ctrl? how do u turn it on? plus i got a whiper like control onder the stearring wheel with decel-accel or sth like that?? wats up wit that?
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Joined: Mar 2010
Posts: 5,891
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From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Newbie
Joined: Jul 2010
Posts: 2
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C200
thnx
thnx 4 the cruise ctrl info dont think i need it tho, sounds like a hustle, unfortunately hav no manual. anyways, my original problem is the abs thingie as posted above...its reli startin 2 **** me off bad. my auto transmission wont shift gears with this abs light on. which sensor?? 97' model c200 w202
Junior Member
Joined: Oct 2013
Posts: 17
Likes: 0
c280
Success! I changed the right rear sensor today and started the car, the lights were on. I drove 20~ meters, still on. I drove a couple of meters more and did a hard break to stress the system, the lights went out and I felt the pedal pumping! Now the cruise control is working, the kick down is working perfectly, antispinn is working, pressing the ASR off button turns it off. Everything is working great again!
I want to thank everybody for helping me solve this!
Info below is for future reference when people are searching_____
keywords: abs, asr, sensor, kickdown, cruise control, break pedal switch, w202, ate
w202 C200 -98 280000km
Measured resistance on front sensors: ~1100 ohms
Measured resistance on rear sensors: ~1060 ohms
Model year 98 onward, two rear sensors behind the heatshield,
models prior 98 one rear sensor on the rear axle.
part numbers for my sensors
front left: a 202 540 23 17 (ate)
rear right: a 202 540 28 17 (ate)
I came to the conclusion that the door locking function when speed >10km/h is controlled by the front left sensor. Also my kick down function and cruise control did not function correctly/at all while I had a problem with the ABS system/sensors. This could be of some help to someone having problems with kick down/cruise and dirty/faulty sensors.
Again, thanks for the help guys - anybody having problems/help ask and I will do my best to help you.
I want to thank everybody for helping me solve this!
Info below is for future reference when people are searching_____
keywords: abs, asr, sensor, kickdown, cruise control, break pedal switch, w202, ate
w202 C200 -98 280000km
Measured resistance on front sensors: ~1100 ohms
Measured resistance on rear sensors: ~1060 ohms
Model year 98 onward, two rear sensors behind the heatshield,
models prior 98 one rear sensor on the rear axle.
part numbers for my sensors
front left: a 202 540 23 17 (ate)
rear right: a 202 540 28 17 (ate)
I came to the conclusion that the door locking function when speed >10km/h is controlled by the front left sensor. Also my kick down function and cruise control did not function correctly/at all while I had a problem with the ABS system/sensors. This could be of some help to someone having problems with kick down/cruise and dirty/faulty sensors.
Again, thanks for the help guys - anybody having problems/help ask and I will do my best to help you.
My 95 C280 had the similar problems. The ABS warning light comes out when the car speed reach at around 80mph. However, the light will goes off when I turn off the engine. unfortunately, the cruise control also did not fucntion correctly as well at the the time while the problems happened.
Oh...One thing I had to tell you that the ABS warning light appear was, after I change the front brake (change to S320 brake system). since the c280 brake pad sensor socket is not compartible to S320 one. I just left it unpluged. (perhaps that might be the cause of the problems). Just searching the forum by knowing you a the expert. Pls give me a sugguestion what to do and how to fix up the problems.. Many thanks
Newbie
Joined: Feb 2020
Posts: 3
Likes: 0
1999 w202
Help!!!
Success! I changed the right rear sensor today and started the car, the lights were on. I drove 20~ meters, still on. I drove a couple of meters more and did a hard break to stress the system, the lights went out and I felt the pedal pumping! Now the cruise control is working, the kick down is working perfectly, antispinn is working, pressing the ASR off button turns it off. Everything is working great again!
I want to thank everybody for helping me solve this!
Info below is for future reference when people are searching_____
keywords: abs, asr, sensor, kickdown, cruise control, break pedal switch, w202, ate
w202 C200 -98 280000km
Measured resistance on front sensors: ~1100 ohms
Measured resistance on rear sensors: ~1060 ohms
Model year 98 onward, two rear sensors behind the heatshield,
models prior 98 one rear sensor on the rear axle.
part numbers for my sensors
front left: a 202 540 23 17 (ate)
rear right: a 202 540 28 17 (ate)
I came to the conclusion that the door locking function when speed >10km/h is controlled by the front left sensor. Also my kick down function and cruise control did not function correctly/at all while I had a problem with the ABS system/sensors. This could be of some help to someone having problems with kick down/cruise and dirty/faulty sensors.
Again, thanks for the help guys - anybody having problems/help ask and I will do my best to help you.
I want to thank everybody for helping me solve this!
Info below is for future reference when people are searching_____
keywords: abs, asr, sensor, kickdown, cruise control, break pedal switch, w202, ate
w202 C200 -98 280000km
Measured resistance on front sensors: ~1100 ohms
Measured resistance on rear sensors: ~1060 ohms
Model year 98 onward, two rear sensors behind the heatshield,
models prior 98 one rear sensor on the rear axle.
part numbers for my sensors
front left: a 202 540 23 17 (ate)
rear right: a 202 540 28 17 (ate)
I came to the conclusion that the door locking function when speed >10km/h is controlled by the front left sensor. Also my kick down function and cruise control did not function correctly/at all while I had a problem with the ABS system/sensors. This could be of some help to someone having problems with kick down/cruise and dirty/faulty sensors.
Again, thanks for the help guys - anybody having problems/help ask and I will do my best to help you.
I'm so glad I found this thread. I am having the exact same problem right now. Could you show me how to get to the rear speed sensors?
Thanks.
Junior Member
Joined: Dec 2017
Posts: 46
Likes: 9
1999 C230K
If yours is like my C230K, the sensors are located on the front of the axle, just inside of the rotors. The wires go from the sensors up into to the trunk to connectors on the trunk floor. The easiest way to check is to unplug the connector and check the resistance of each sensor with an ohmmeter. IIRC it should be around 1.1K. It it's zero or infinite that sensor is bad.
Newbie
Joined: Feb 2020
Posts: 3
Likes: 0
1999 w202
I think I found 'em
If yours is like my C230K, the sensors are located on the front of the axle, just inside of the rotors. The wires go from the sensors up into to the trunk to connectors on the trunk floor. The easiest way to check is to unplug the connector and check the resistance of each sensor with an ohmmeter. IIRC it should be around 1.1K. It it's zero or infinite that sensor is bad.
You were spot on! Mine is a c230k. I went a-hunting yesterday and found what I believe are the rear speed sensor connectors on the trunk floor. I will check resistance values tonight.
I also believe I found a fuel connector down there, and now I know what it does to the car to unplug it. 😁
Thanks for your prompt response.
Junior Member
Joined: Dec 2017
Posts: 46
Likes: 9
1999 C230K
If yours is bad, check the part number on it before ordering a new one. It should be stamped somewhere on it. My part number on my left rear was A2025402717, with A2025402817 for the right, but FCPeuro didn't show that as fitting my car. Using EPC didn't seem to help because it seemed those part numbers didn't quite match my build codes. I ordered the part number that was on car anyway, for under $30, and the car works fine.
