ESP fault plus ABS straight after !!!

[S50OOL]

Hi,
This fault now has me perplexed. We have a c180 kompressor 1.8 petrol 6 speed manual, 2005. We have 4 other cars so doesn't do great mileage in fact 1006 miles since last year's mot. When last driven all was fine. Getting it ready to go for this year's mot on road it throws esp light up and then within couple of seconds and light up on dash. If I stop it resets but then same scenario once travelling. I'm lucky enough to have my own star set up and the code showed was for right side multiple ring so ordered and replaced and erased code. Road test still had same experience so to rule out I put ring in wrong swapped osf and nsf hubs expecting to see fault transfer. No still the same faults showing. Then checked the sensor but showed as ok but changed to new to be certain thinking it's the only other possibility. Road test shows same results on star. Have checked and cleaned the connections all way back to N47-5 esp,aps and bad control module. Checked integrity on loom and all appears perfect. Swapped the ecu on a chance but still the same. Have reset the steering angle sensor and nothing I can find alters the problems. Can anyone take pity on my insanity and point me to anything obvious I am missing and not so obvious. Star showing nothing else at all. The only other thing I find is sometimes it shows as a stored code others it is present and stored but no rhyme nor reason to it, mostly shows as stored but wanted to mention this if it means something to someone. Thank you for reading my long post but wanted to try and convey all I have done to ensure it doesn't waste extra time saying I tried that!!!

 

[Flyinspanner]

Is stored code for brake switch?

Had that on our A class recently, They not only illuminate lights but signal the ECU, I had same symptoms, star diagnosed it, and a switch is around £11 from MB, takes one minute to change.

There may be a BAS switch on your servo - not sure on that model, may be worth a trip to your local indie?

 

[S50OOL]

It's the facelift model so doesn't have the normal brake light switch as our clk320 was cured along that route. The code is consistently showing as the multipole ring check and clean which is why I'm so confused. Clearly changing that and the actual sensor for new should mean the code is now cured as nothing else is in the circuit. The wiring is ok and checked all the way back to the ecu. According to wiring diagram nothing else on that circuit. Will check the bas sensor though on master cylinder. I will see if unplugging it will bring another code up and then that should confirm if it's working correctly at present hopefully. Thank you for taking time to respond and I will update when I finally cure this in case it helps others long term

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[S50OOL]

As an update so far, I used the live useage data function on star to check the outputs on the abs sensors while driving. The nsf, nsr and osr all give steady and consistent outputs correct to speed shown on dash. However the osf that is bringing the fault code up is dropping signal, for example say a steady 30mph it will drop to 11.4mph then recover to correct speed then to 16.6mph etc. As I have replaced the multipole ring and sensor and cleaned the connections I am assuming and yes probably dangerously so that it must be a loom fault from sensor to ecu. This will be my next fun time activity to check through. If I am missing something them please shout out as I am more than willing for any advice and even reprimand for incorrect assumptions. As before I will update for any help for others in future. Forgive the delayed replies as I have a heart condition which some days curtails my ability to play !!!! Thanks for your patience reading my waffle.

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[S50OOL]

As promised I wanted to give the solution to the problems with the esp and abs on our C180K. After the star diagnosis and fault code for C1114 right sensor check clean multipole ring ect and the previous listed checks and much tearing out of hair, checking all wiring, connections and so forth and all related systems with no further problems being found it was apparent this had to be some sort of obscure event causing the systems to bring the error up. The only thing I had noticed on checking hub and ring ect was that the brake disc back plate was corroded particularly the raised protective part that covers the back of the hub and sensor. Approx 60% had rusted away so with everything else checked I, with very little hope or understanding why it should bring up a fault ordered a new back plate. Fitted it today reset all the system with star and roadtested and the car is back to its perfect running self. I have no idea why it should bring this fault up but it certainly has and replacement has cured the problem, the only thing I could think of is because the back of hub and sensor was now open to the elements it affected the signal pick up. If it helps some one with a very odd to cure fault on these systems please check the backplates if everything else you check hasn't worked. I thank everyone for their patience reading my drivel and happy motoring in the best marque out there.

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[John Laidlaw]

Thanks for the update - all’s well that ends well etc

 

[LostKiwi]

I'm guessing while it was all apart the whole area was given a good clean? Rust flakes on the reluctor itself would cause the sensor to misread.

 

[John Laidlaw]

Aye rust is a great conductivity resistor !

 

[S50OOL]

Yes while apart everything was cleaned thoroughly and the new multipole seal fitted with great care and attention. I also stripped and checked the other side expecting the shield to be in same condition if not worse considering it was the nsf and so getting the worse of the weathering from the kerbside. I found that almost perfect so clearly on this car the osf shield has been the one by far the poorest made. Thank you for all the replies and again if this can help some one else with an odd esp fault then all's well.

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[RUBBER_UNDIES]

My abs and esp light came on. This I what I did to fix it.

I have a 2003 w211 though.

The dust plate at the back of the brakes was rattling on my front of my car.

I left it for a few weeks. It was then rubbing on The abs reluctor ring and wore it out.

Replaced the rings and fixed it. The abs sensor was okay.

Hope this helps

 

[mercmancdi]

My abs and esp light came on. This I what I did to fix it.

I have a 2003 w211 though.

The dust plate at the back of the brakes was rattling on my front of my car.

I left it for a few weeks. It was then rubbing on The abs reluctor ring and wore it out.

Replaced the rings and fixed it. The abs sensor was okay.

Hope this helps

What is abs reluctor ring , is it where the sensor fits to the back of the brake.

 

[XJ600]

This is the reluctor or exiter ring. Creates signal via pick up (sensor)

 

[mercmancdi]

This is the reluctor or exiter ring. Creates signal via pick up (sensor)

Thank you ,so it’s in rear drive shaft.

 

[RUBBER_UNDIES]

Thank you ,so it’s in rear drive shaft.

Yes. It works on what's called a HALL EFFECT.

 

[LostKiwi]

Yes. It works on what's called a HALL EFFECT.

Only newer technology. Early ones work on reluctance (hence reluctor).

 

[RUBBER_UNDIES]

Only newer technology. Early ones work on reluctance (hence reluctor).

Aye.....