Ok, my dad has this i think it's an A170 MB that has ESP/BAS light on and automatic tranny that i think is in limp mode, since it only has 2nd gear and reverse working..
We checked the codes with a scanner, its showing:
cdi:
P1221 Can signal from ASR/EGS/ESP -Current and stored
esp:
C1024 Engine CAN to N73 (EIS control module) interrupted -Fault indicator lamp on
The scanner we have wouldn't connect to transmission control unit, so i cannot know about that.
But these codes seem to indicate to ESP, so is it possible ESP is making the transmission go to limp mode?
I was reading this forum and noticed many people replacing the brake switch, could this cause the problem here too?
On the other hand the problem stays on on this car even after clearing the codes.. At first we were ably to get the ESP/BAS light off by clearing the codes but now it stays on all the time.
Can anybody help with this one?
When I had problems with the esp, yes I did clear it by fitting a new brake switch but my car is manual
so i can't help beyond that except to say make sure the battery is fully charged and the the detectors have not been /dislodged affected by snow ice if you have that sort of thing where your are? #
the duff/suspect battery causes a multiude of problems with his car.
We checked the wheel sensors with the scanner, all showed approximately the same speed when driving. The battery seems ok, since the car starts normally, but i guess we could check that aswell. The brakelight switch was checked, we didn't find problems with that.
Just as a point of interest how did you check the brake light switch?
Mine was working normally but i had an ESP light lite . Having checked all the sensors connections etc I decided the cheapest place to start was the stop light switch £10, seconds to fit , no diagnostics required to change that and I was right when i pulled the switch apart Bert Rowe's-A-class info .Brake Servo, Foot Brake Handbrake.& ESP/BAS
the contacts were badly pitted and worn I have no problem since, but I could have still be looking if I hadn't had the hunch that was the cause.
The brakes and ESP/ABS are so closly linked that it pays to try a new £10 switch before moving on the the more expencive items and daignostic tests unless you have your own unit, or money to burn.
Daft though this sounds, get the tracking checked. Faulty tracking caused the ESP light on mine to come on.
RH
What's tracking? Do you mean the wheel sensors or what?
Lofty, thanks for the input but my dad said he took the switch apart and he said both the contacts were ok. Also i would think there was a diagnostic code referring to the switch if it was the problem, instead it points towards the CANbus..
yes I would expect the tracking(Alignment of the wheels with the chassis when the steering wheel is centralised ) to bring up an ESP light in the same way worn trailing arm bushes will do the same in each case there is some tolerance.
yes I would expect the tracking(Alignment of the wheels with the chassis when the steering wheel is centralised ) to bring up an ESP light in the same way worn trailing arm bushes will do the same in each case there is some tolerance.
Ok, i get what you mean now. Perhaps this is caused by wheels not spinning at the same speed, caused by the misalignment.
Though i think it's not the case with this car since the ESP/BAS light won't even really turn off anymore even if we try to reset it with the scanner.
It's off only a second after resetting and when i turn ignition on, it comes right back on..
Ok, it seems now that the esp code c1024 goes off if brake pressure sensor connector is removed, and codes being reset, but ofcourse brake pressure code will appear.
Apart from the camber of the wheels, or the vertical plain of the wheels, which causes wear to the outside edges of the tyres dependent of which way the camber is out of line, there is also the problem of tracking, where the wheel is not pointing 100% in line with the car when the steering wheel is centralised, this causes rucks on the tread of the tyre as the tyre is running at an angle reletive to the road. can easily be cause by incorrect adjustment/fitting of track rod ends
In older cars this problem could be clearly seen whilst following the car, sometimes known as crabbing, the car actually runs at an angle to the road. like a crab hence the word crabbing
When removing struts or track rod ends for istance these MUST be reassembled precisly as removed if you make any adjustments, intentionally or otherwise you will have problems and undue wear on your tyres as well as the ABS/ESP light may light in the instrument cluster when you start driving the car..
There are no sensors on the car to my knowledge that will detect incorrect camber angle ,(wheel angle) however if the tracking is out the ESP/ABS light will light, this should cause you car to fail the MOT, in the uk at least.
Remeber that on the 'A' class the ESP/ABS light will show automatically every time the battery is disconnected,reconnected, by turning the steering wheel fully left, then fully right the lamp should extinguish.
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