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Sticking gears & limp mode! Help please

sclasscab

New Member
Joined
Jul 20, 2009
Messages
12
Location
Norwich
Car
S320 CDI
Hello again guys and gals, I am at my wits and pockets end! I did previously post and took your advice to get codes read S320 CDi 2001. Jobs done and parts replaced since first codes read etc.
New mass sensor, air filter, oil seperator (not seperating), No1 injector, gearbox oil and filter renewed (at merc garage/indi), all gaskets from turbo to inlet (rubber rings & board) replaced, removed intercooler and cleaned (not too dirty), EGR removed and cleaned (water side not too bad 4 months old (prior to my purchase), inlet side absolutely caked in carbon and oil), Fingers up inlet manifold and a hand full came out, manifold off, if I condensed the amount of crud it would fill 4 mugs (amazed it was running at all), clip union (from stepper motor) to secondary flap openings was disconnected with flaps closed and siezed, steam cleaned EGR and inlet manifold, new gaskets/rings for heat exchanger and EGR. refitted all in anticipation of a new car like feel, started car and left on tickover to warm up, fair amount of smoke/fumes two bad black patches on the grass (doh) from exhausts, out for a run (15 miles) felt as if it were breathing better then, LIMP MODE (aargh).
I had previously removed the gear selector module, opened the black box and cleaned the led sensors for selector position and repaired a broken case fixing which worked fine for three weeks, then back to sticking in any gear it fancied, job done again and fine for one week. Sorry about the length of this post, but I thought it best to give all info. So I think try a main dealer diagnostic they might be better (against my better judgement). After their first test they said they could not tell me for sure if it were the selector module at fault as the report was inconclusive and could I return the vehicle once it had played up again. So back I went the following day with both problems, onto their machine it went, initial and final tests after clearing codes, and you guessed it, can we keep the car for two days to run as many tests and work we deem required to fix your bank balance, sorry problem. Below are all the relavant codes, I have ommited dodgy seat and comand, mirrors etc for obvious reasons. A couple of small points that may help are, the vacuum pipe from pump to brake cylinder does not appear to seal very well, it can slide off without using the retaining clip tabs (tried a bit of PTFE as a short term bodge) to help the suck. Seems to stick in the particular gear it was in when braking to a stop, ie third to stop, pull away in third etc, although not always. If I accelerate around a bend in limp mode on occasion it seems to be able to rev (higher than the usual 2K) some times up to 3.5K (Strange). I have checked as best I can the vacuum units for the EGR and the turbo and pipes, if anyone knows a difinitive way it would be appreciated.The BAS and ESP warnings come on at random and apparently have done for years with no major side effects (mmm)!
ecas = event current and stored cas = current and stored es = event stored s = stored
First diagnostic from Merc indi,
04.08.09
ETC Event p2311,p2314,p2316,p2312,p2315,p2404,p240c all es
ESM Code p1856,p1911 both s
CDI 2 Code p1470-016 s,p0100-001 ecas,p0100-128 ecas, event p0703-128 es
ESP Code c1022-025,c1200-008,c1204-003,c1201-003,c1024-004 all s
Airmatic Code c1026-002,c1026-004,c1026-016,c1027-001 all s

05.08.09 follow up merc indi
ETC Event p2311 ecas,p2314,p2316,p2312,p2315,p2404,p240c all es
ESM Code p1856 cas
CDI 2 Code p1470-016 s
ESP Code c1022-025,c1200-008,c1204-003,c1201-003,c1024-004 all s
Airmatic Code c1026-002,c1026-004,c1026-016,c1027-001 all s

14.09.09 main dealer initial test
ETC Event p2311,p2314,p2316,p2312,p2315,p2404,p240c,p2313 all es
ESM Code p1856,p1911 both s
CDI 2 Code p1470-016,p1403-032,p0110-002,p0105-001,p1664-008,p1192-004 all s, Event p0703-128 es
ESP Code c1022-025,c1200-008,c1204-003,c1201-003,c1024-004 all s
Airmatic Code c1026-002,c1026-004,c1026-016,c1121-002,c1027-001,c1027-002,c1517-002 all s

They failed to give me the final quick test

15.09.09 main dealer initial test
ETC Event p2311,p2314,p2316,p2312,p2315,p2404 ecas,p240c all es
ESM Code p1856 s
CDI 2 Event p0703-128 ecas
ESP Code c1022-025 cas,c1200-008 cas,c1204-003 s,c1201-003 s ,c1024-004 cas
Airmatic Code c1026-002,c1026-004,c1026-016,c1027-001 all s

15.09.09 main dealer final quick test
ETC Event p2311,p2314,p2316,p2312,p2315 all es
ESM tick
CDI 2 Event p0703-128 es
ESP Code c1022-025,c1200-008,c1204-004 all s
Airmatic Code c1026-002,c1026-004,c1026-016,c1027-001 all s

Congratulations if you have made it this far, apologies for the length again. If any of you kind wizards can help solve my problems I will personally buy you a beer as I do travel the country as a taxi driver, and hopefully in the S before too much longer, I have only had it a short time but do now understand why you guys love em (when they work). Any queries or questions and I will get back to you as soon as I can. Many thanks, Danny
 
Looks like something is dragging down the CAN bus. The CAN is the Control Area Network, much like a home PC wired network where information is shared between individual modules.

It could be one of the onboard modules or it could be a wiring fault, it's gonna need some time spending on it to pin down.
 
Hi again, do any of you think I need to change the gear selector module? I dont know where else to start, I know this would not effect the limp mode but at least I could drive it to work out the limp diagnosis, what do you guys recommend?
 
why do you suspect the esm? it is not the hot favourite regarding limp home, unless i missed something? did you cross reference all those fault codes??
 
The ESM is also on the CAN bus so could be a candidate. The vehicle modules are connected in what is essentially a paralell electrical circuit by 2 hardwired connections named CAN high and CAN low. The implication is that any module on the circuit by virtue of the way they are connected can (and often does) "drag down" the whole bus when an internal module failure occurs, this causes multiple CAN error messages in various modules.

It looks at the moment that the raft of DTC's you have are re-setting straight after they have been cleared, this ought to simplify matters. You're gonna need a STAR or similar.......Unplug say the ESM 1st, clear the codes and see what re-sets with the ESM unplugged, sure, you're gonna get an ESM comms/CAN code from the TCM, but if the other modules then come back online and you don't get the CAN codes for ECM, instrument cluster etc. then there's your culprit, if not then repeat the operation for the other modules, if none of that has the desired effect then it looks like a wiring loom fault.

Just one more quick check.......Make sure you have a healthy battery, if when cranking the battery voltage drops below about 10V this can cause heaps of trouble.

HTH.
 
Thank you for the help Buggerlugs, do you know if I can buy a reader cheaply and if so where from, as I suspect my local indi would not be happy with me tying up his machine for that length of time. I can get a secondhand gear selector for £220, and with the sticking in gears I am leaning towards it, any ideas. Thanks again guys.
 
Thank you for the help Buggerlugs, do you know if I can buy a reader cheaply and if so where from,

Sorry m8, I don't. Problem is, the "cheap" readers won't be any use anyway. TBH, if I were you I'd have the car into a competent local MB specialist or Sparky and let them have a couple of hours on it.
 
Another reason I think it may be the selector module is, whilst in my main dealers buying some bits the other day I asked the price and availability of the gear selector module, it showed up on his stock record that MB had issued 559 of them in the UK in the last year. I asked him about recall but due to the age/mileage of my car they would'nt touch me (doh)! Shall I plump for the secondhand one £220 with 3 months guarantee, or main dealer £370 +vat and an hour coding at £115 + 7-10 from Germany? I also have a wedding to do next weekend! Any advice gratefully received.
 
The only further help I can offer right now is to tell you that I've never had to code a new ESM. Perhaps that's something to clarify with your dealer?
 
thanks, but i understand the technology buggerlugs, this is my day job. :)

i suggest again that the o/p changes the brake pedal switch first, as it is a recurring fault and known problem. also very cheap and easy to do.

yes, it could be a module corrupting can comms, but why suspect the esm? as buggerlugs says, disconnecting them one at a time is a good way. i read this as an intermittent fault however, and as such it is sadly not possible to go this way. the esm can be swapped for a s/h one if the part numbers are the same, but should need the coding setting for the specific car, eg engine type. i do wonder how much oil has got into the etc module though, could be worth a look...
 
Sorry guys I should have said before re the brake switch, I have had three new ones altogether, including one the MB garage tried whilst doing their diagnosis test. Also noticed a leak from the banjo joint on the bulkhead end of the fuel rail, I have new MB washers does anyone know the torque setting for the banjo as I would hate to ring it off whilst tightening? Pretty please. Thanks again for all your posts.
 
no idea of the torque, but it would be hard to get a wrench in anyway. i should not worry too much, the rail is made of a hard material and it would be very hard to overtighten (unless you were actually trying to).

you are showing us four test results at the top of the page, are we to understand that all module memories were erased after each test? i can see some obviously were, but unless all were each time we may get the wrong picture.

i work in stowmarket danny, if you wish us to have a look then you can ring me at work on monday. i suggest you pm me for details if interested...
 
I was told they tried to clear them after each test, however I was told there were some they could not clear. Alexander I am not allowed to pm until I have posted 30 times, is it possible for you to mail me your number and a convenient time for me to call you.
 

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