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Old 09-07-2012, 10:39 PM   #1
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w203 EPS FAULT

hi there
i braught a 2001 c180 (w203)
about 3 or 4 weeks ago. Its been going well until this morning on the way to work when there was a sudden jerk to the left followed by the yellow triangle lighting up then followed by EPS fault message.
working at a garage i have access to a scan tool. the codes were
C1022
C1024
C1031
C1200
C1120
C1140
C1400
i cleared the codes to see if it would happen again as some of the codes could have been stored previously.

on the drive home about 20min from home it happend again. the jerk to the left feels like the ABS is locking the n/s/f wheel for a split second

i read the codes again at home and they all have appeard again

i just dont know where to start! im having trouble finding out what all the codes are!

any help would be appecated
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Old 09-07-2012, 10:56 PM   #2
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Hi ya, i will have a look for the others
C1022 ESP CAN communication with the engine system is faulty
C1024 CAN Communication With Engine Control Module Interrupted
C1200 BAS/ETS light on: stop light switch defective
C1140 ESP fault: pin 18,19,20 on ESP controller corroded
C1031 Engine control module not identified or incorrect control module. STORED
C1120 N64(ESP yaw rate sensor):Signal cable has Open circuit or Short circuit. STORED
C1400ASR/ESP charging pump (M15), open/short circuit, This is a generic obd11 code i think and not merc specific

I think all the codes are to do with water ingress

Martin

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Old 09-07-2012, 11:17 PM   #3
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A couple of links for you to take a look at. Not sure about them being year/model specific. Maybe someone with a better knowledge will be able to help.


Mercedes Benz Fault Code Manual





__________________________________________________ _______________

This one doesn't find some of the codes, but there are few.

Mercedes-Benz P0172 OBD/DLC Error Code - System Too Rich


Sorry I can't be of more help

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Old 11-07-2012, 08:09 PM   #4
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thanks for the replys

i havent had any time to look at the car atm
i think i will start by checking the brake switch and the wheel sensors

its just weird how it seemed to happen about 30/40min into a jurney
and at any speed. the first time i was doing 30mph and the second i was doing 70 on a duel carrageway. could possibly be water ingress as i did give the car a good clean
does any one know where the esp ecu is? or is it part of the abs ecu on the pump

the dangerous part is the fact that the abs activates on the n/s/f wheel for a split second an as you can imagn that split second can be extremly dangerous at 70mph
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Old 11-07-2012, 09:50 PM   #5
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Surely it's best to clear all codes and rescan when the fault re appears???
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Old 12-07-2012, 06:51 AM   #6
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Surely it's best to clear all codes and rescan when the fault re appears???
thats what I did the first time! All 7 codes appeard again!
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Old 12-07-2012, 08:44 AM   #7
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thats what I did the first time! All 7 codes appeard again!

I don't think people bother to read the whole thread a lot of the time
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Old 14-07-2012, 01:13 AM   #8
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update:- iv taken the car out for the first time since and no problems ( so far ) I think im
Still gona have a good look over it 2moz! Also I spoke 2 a friend of mine who used to work for mercedes, I explaind the symptoms and codes. He seems to think it could be the brake pedal switch. If so I still cant work out why it would cause just the n/s/f wheel to lock for a split second! If it caused both fronts at the same time then fair enough! but on one wheel? really?
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Old 14-07-2012, 08:58 AM   #9
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If it has stopped doing it then maybe it was water ingress as i said in my first post and it has dried out

Martin
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Old 14-07-2012, 10:12 AM   #10
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Could it be a faulty ABS wheel sensor, or could water ingress of the sensor cause the symptoms?

A couple of extracts from a C Class (W203) workshop manual:

Correct operation of the stop-light switch is essential. Without the signal from the stop-light switch that the brakes have been applied, the ABS will not function. Similarly if the signal from the switch is delayed (due to the switch plunger sticking, for example), there will be a corresponding delay in operation of the ABS.

On models equipped with traction control, the ABS unit is a dual function unit, and performs both the anti-lock braking system (ABS) and the Traction control (ASR) system functions. On models with Electronic Stability Program (ESP), the ASB unit is also used to modulate the brakes as required.

The ECU is located in the fusebox at the right hand side rear of the bulkhead.
There are several warnings regarding static electricity and the ECU. If you intend checking it at all, let me know and I will scan the relevant info and let you have it, or indeed any info you require regarding the brakes and their components.
The ECU is a none serviceable item.
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Old 16-07-2012, 09:03 PM   #11
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UPDATE:- After driving to work today all 40 miles of it (Its back on) about 35 miles into the jurney BING up came the eps warning!
code read it at work and the only code there was the c1120
our scan tool describes the code as- C1120 ESP YAW RATE SENSOR (N64)
but as per walsi's post -C1120 N64(ESP yaw rate sensor):Signal cable has Open circuit or Short circuit. STORED
it could be broken cable to the sensor or the sensor it self?
does any one know any more about this sensor or where it is located?
i did a lil reserch and found the location in the coupe is in the boot but i have a saloon could it still be in the same place?
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Old 16-07-2012, 09:35 PM   #12
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I can't help with the location but i get this code on the vito sometimes when i go over a rough lane, on mine it is located right next to my left boot just under the edge of the rubber floor mat right where it gets wet and dirty if you have muddy boots. What were they thinking sticking it there. I just delete it and forget about it, i might actually sort it one day.

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Old 16-07-2012, 09:43 PM   #13
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Quote:
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I can't help with the location but i get this code on the vito sometimes when i go over a rough lane, on mine it is located right next to my left boot just under the edge of the rubber floor mat right where it gets wet and dirty if you have muddy boots. What were they thinking sticking it there. I just delete it and forget about it, i might actually sort it one day.

Martin

lol im driving with the eps turned off atm and trying to forget about it
but every time i look at the clocks i see the yellow triangle shining away at me lol its hard to ignore lol
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Old 21-07-2012, 12:46 PM   #14
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Right iv located the YAW sensor, it is in the boot. iv also some how located some water around the sensor here is some pics just to show any one else with the problem


the boot


if you look towards the top left you can see a hole gromit i removed to drain off some of the water there is two there both we corroded around the edge. its possible this is where the water got in


a close up of one of the holes. the black mat around the hole is soaked


a close up of the wire harness that comes from under the boot again you can see water and corrosion i have not attempted to remove this yet to clean the hole as i dont know what it goes to or if its supposed to come out.


water and corrosion around where the sensor bolts down.


both the holes. i have removed the gromits and removed the soaked mat dryed the lot and refitted and sealed the gromits.

now just have to wait and see if the water is still coming in
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Old 24-07-2012, 09:41 PM   #15
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ok the problem is still there infact its now getting worse. happening as soon as you start to drive it! i do have access to an oldish carsoft scanner that iv used on my previous 202's. the only thing is it has a 38pin connector not the newer 16 pin
does any one know if the 203 has a hidden 38pin somewhere that mb might use or do mb now use the 16pin?
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