Mercedes c220 cdi 2005 ,esp and abs on cannot communicate with modules

[luap1]

hi all ,i have a 2005 c220 cdi 2005 ,my abs srs and eps lights
have come on after the car has been sitting for a few months
i have scanned the car and it is not letting me into the abs ,srs and
eps modules,fault codes present are ,

p2300- class 2 serial data circuit is shorted or low for approx, 3 seconds can communication
with other control modules is not possible ,bus off fault

p2310 - one or more messages from control unit n47-5 9esp and bas control module
module not available on the canbus timed out

p2314- one or more messages from control unit n73 eis are not available on canbus
can timed out

p2316- one or more messages from control unit n19 air conditioning control module
are not available on canbus ,can timed out

i have checked fuses, wires etc but no help ,
does the abs module need coded if i replace it as well ?

many thanks
paul

 

[onefortheroad]

Id think so .

 

[robin.large]

I know it's a bit simplistic but have you tried resetting/clearing the codes, then disconnect battery, fully charge battery (charger) then reconnect?

Sent from my ONEPLUS A5010 using Tapatalk

 

[luap1]

hi robin yes scanned and will only clear the abs code for about 3 seconds and then comes back on again
the other faults do not go out at all ,they are not going out as the scanner cannot communicate with them,
there seems to be maybe a canbus fault as it is not letting me scan some of the control units
i have scanned it with 3 different scanners and 0ne of them told me about the non communication with
the modules but the other 2 one a snapon and the other dephia could not get into the control units at all
have you had the same problem robin ?
paul

 

[luap1]

sorry should have said also brand new mercedes battery fitted to the car last week
paul

 

[umblecumbuz]

You mention three scanners. Like more and more manufacturers, the generic OBD codes are supplemented with manufacturer-specific codes that throw gremlins into the mix.
That's why model-specific scanners are way ahead of normal units.
Merc use Star at their dealers, which is obviously capable of reading all the codes, and many members on here are equipped with manufacturer-specific code readers - such as iCarsoft. Generic code readers are often not able to do this, and may throw up faulty diagnoses.
Have you been able to check the wheel speed sensor readings?

 

[luap1]

hi i am unable to get a reading from any components of the abs esp srs etc
i cannot get into to them to see what codes they hold ,the canbus system seems
to be faulty but it runs through all the modules and how do i find which one is maybe
faulty ? there are too many in the car to start disconnecting them one by one
if i fitted a second hand abs pump onto the car as i have a good second hand one here
does it need coded in or is it plug and play ?
cheers
paul

 

[umblecumbuz]

From memory a replacement abs pump on your model does not need coding.
But changing parts before diagnosing the fault is putting the cart before the horse. If faults still show up after you have swapped the abs pump, what will you choose to change next?
The reason I mentioned wheel sensors is that they can throw a host of faults such as you've itemised. So can a faulty brake switch or yaw sensor on your model.
If you tell us your location, there may be a good Merc indie near you who could help. Most of them are known to forum members.

 

[luap1]

hi thank you ,i will only change the pump if needed ,
the merdedes garage close to me will not give out any info
the car has to be book in
paul

 

[umblecumbuz]

hi thank you ,i will only change the pump if needed ,
the merdedes garage close to me will not give out any info
the car has to be book in
paul

That's why I suggested an Indie (Independent Mercedes Specialist). They are generally cheaper than Merc dealers and usually far more knowledgeable and helpful.

 

[luap1]

were i live the is no one about that would specialise in mercs
paul

 

[robin.large]

Once you get errors relating to Can Bus Comms the quickest route is to get a full scan on star or xentry which utilise additional pathway combinatíon.

Sent from my ONEPLUS A5010 using Tapatalk

 

[mattkh]

As the cars stand for so long nowadays, the battery voltages are going down to even 3volts. Was the new battery connected without any problems?
One other thing. Any chance of a rat eating any cable? OR
any rain water going into the car?

 

[umblecumbuz]

were i live the is no one about that would specialise in mercs
paul

That's a pity. I live 120 miles from my nearest Indie, but well worth the drive. Still better service and less expensive than my nearest MB Dealer.

The advice you've been given above still holds good - get the car properly scanned with the right code reader. Otherwise you're guessing in the dark.

 

[luap1]

battery fitted 100 % properly ,rang my merc dealer today and he wants £170
to just do a scan on it ! checked all the wiring from the engine bay to inside the car etc
did continuity test on the wiring and 100% ,it is still just telling me the canbus is not
working on the abs and esp srs modules thats why i can get the scanner to link with them
but finding the problem why they are is becoming very annoying
i am going to do a resistance test on the system tomorrow to see what the resistance reading says
il update if i get ant result from my tests
paul

 

[umblecumbuz]

For less than the cost of your MB Dealer's scan you could buy a iCarsoft MBII scanner, which is about the best dedicated code reader you can get for your model. Using a generic scanner will not give you the true picture.

were i live the is no one about that would specialise in mercs
paul

Whereabouts are you based?

 

[onefortheroad]

battery fitted 100 % properly ,rang my merc dealer today and he wants £170
to just do a scan on it ! checked all the wiring from the engine bay to inside the car etc
did continuity test on the wiring and 100% ,it is still just telling me the canbus is not
working on the abs and esp srs modules thats why i can get the scanner to link with them
but finding the problem why they are is becoming very annoying
i am going to do a resistance test on the system tomorrow to see what the resistance reading says
il update if i get ant result from my tests
paul

The £168 isn't just for a scan ,its for 2 hours and if they can fix it in that time they will.

 

[umblecumbuz]

Hope you get it sorted.

 

[M80]

Be careful doing the continuity tests.
I've seen where meter probes are pushed in and then the blades are flared and can fail to give a reliable connection when plugged back to the sensor.

The only way to be sure is plug it back and test from the other end while manipulating the connection. Unless you have the likes of Star that can often see a failed cct.
At least I was doing that in summer, but still a lengthy process. I identified 3 components with failed connections, the components were ok.

Using needles and croc clips can save that, but then the connection for testing mat not be secure.

 

[Tony Dyson]

Don't do it! Unless you know exactly what you're doing, to measure resistance a test voltage has to be applied and some test instruments can produce test voltages < 1Kv! Anything over 5v will start frying components connected to the Bus.
I would agree with the advice of others and find someone with Star Xentry who can use it.