advice needed r170 slk gearbox issues - Mercedes-Benz Forum
 
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post #1 of 10 (permalink) Old 06-10-2019, 11:37 AM Thread Starter
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Question advice needed r170 slk gearbox issues

firstly ide like to apologies for the likleyhood that this is posted in the wrong place, im new to the forum but il figure it out

im looking for any advice on the issues ive been having with my 2003 slk 230 r170 (automatic)
most signs have pointed to the gearbox but its a big job to change and ide like to look for other causes, any ideas would be greatly appreciated.. heres the situation:
(the first section may not be relevant except it relates to electrical issues which may be [hopefully] whats caused my current problem somehow)

1- old issue
around 4 months ago the central locking suddenly stopped working (hasn't since but dosnt bother me as i dont like waking up to tend to car alarms much anyway)and at the same time the abs light came on and the traction control button became unresponsive. i took the car to a local garage who changed two rear speed sensors (which read from reluctor rings) and a third sensor for air intake temperature which was bringing up a fault code also.
The abs and esp worked for about a week and the abs/esp light came on again, same symptoms.. i went to the same garage who told me the offside rear reluctor ring was damaged and missing a small piece "probably a stone chip" i left this for a week as it seamed unimportant but the problem went away on its own. a month late the check engine light came on and i called the aa before starting it, they told me this was because of the reluctor ring and not to worry. i left it at that. days later it was gone and not heard from since.

2- current issue (help XD)
two weeks ago the car started to make a whining sound when accelerating and decelerating, it was barley noticeable on day 1 and very clear on day 2 (driving around an hour one each). driving on the third day (to my mechanics) i noticed that the car changed a single gear later than it normally would, moments later drive was temporally lost i was reving the engine but effectively no clutch, when trying to change gear manually (this version of the r170 has a sequential electronic stick) nothing happened. i pulled over and noticed that upon engaging drive the car no longer "sat down" infact it was like stick did nothing. after a 10 minuet cool-down it was able to move again but only a few 100 yards.
i had it recovered and the garage changed the oil in the gearbox as well as replacing the filter. the car was fine untill the other night (10 days since oil) when the problem came back, this time the heater stopped working as well (not cold but stopped completely). i suspected something with the battery (because i know how old mercs feel about less than perfect batterys ) so today i took it to a local friendly battery tester who told me it was running fine on amps and volts.

im now left looking at a potential major issue with the gearbox, hopefully someone can suggest otherwise, heres some shots int eh dark ide like to rule out or pop in the maybe pile with your help..
ecu / tcu etc.
torque converter
linkage

Many thanks
Xeondeco
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post #2 of 10 (permalink) Old 06-11-2019, 01:46 AM
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Do you know the numbers of the fault codes your garage found?
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post #3 of 10 (permalink) Old 06-11-2019, 03:33 AM
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more than likely the data plug has wicked trans oil in the loom to the TCM module (trans computer). this would account for erratic and odd behavior.

to check pull up the carpet on the passenger foot well and unplug it to see if its wet.

the TCM is the black box in this picture with Siemens on it.

if it IS full of oil, just get a replacement off ebay. these do NOT REQUIRE programming on the R170 SLK and are straight plug and play as long as the part numbers match.

at the same time replace the data plug going into the transmission.

if there is no oil in the above, then the next thing that could be playing up is the conductor plate. replacing this maybe above some DIY but certainly do-able.

my bet is oil in the TCM....
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- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
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post #4 of 10 (permalink) Old 06-11-2019, 03:35 AM
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you can clean it, but second hand ones are cheap so just swap it over if this is the case

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
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post #5 of 10 (permalink) Old 06-11-2019, 04:55 AM Thread Starter
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Thanks so much for your replies, didn't expect so much so soon.
I don't remember the fault codes at the time but I have a odb and will check this evening and update the thread with the current ones.

An oily tcu would be a godsend and it's something I hadn't considered checking so really appreciate the write up on that, IL also check this later today and let you know what I find.
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post #6 of 10 (permalink) Old 06-11-2019, 03:27 PM
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OBD will only read engine codes, it wont go into the TCM or other modules. you need the mercedes STAR DAS or Carsoft 7.4.

the 5 speed auto gear box is pretty good and the only things to possibly go wrong are the above.

it could also be wear and tear with dirty fluid but hearing of rebuilds is quite rare with this box unless they have done ridiculous amounts of kms/miles

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
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post #7 of 10 (permalink) Old 06-12-2019, 01:21 PM Thread Starter
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sorry i couldnt get back to you all yesterday

ive checked the odb and have the following fault codes

p0700 - powertrain
transmission control system

p0715 - powertrain
input/turbine speed sensor circuit

p200F - powertrain


as far as i can tell the second two concern the damaged reluctor ring i mentioned earlier
the first may be an indication to confirm subby_'s theory but ive yet to get in the footwell and find out (very bad weather here)

researching this online has also pointed me to the gearboxes conductor plate which is apparently troublesome in this model, although this is something i have no understanding of atall is this something anyone has information on ?
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post #8 of 10 (permalink) Old 06-12-2019, 04:06 PM
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all those codes point to electrical issues from the ME not being able to talk to the TCM properly.

this is strongly leaning towards oil in the data plug and TCM...

- ASP pulley kit
- 87mm supercharger pulley
- Ported Eaton M62 supercharger
- Ported supercharger inlet manifold
- MAF screen & throttle body screen delete
- Automatic intercooler spray kit
- Single 2.5" Magnaflow Hi-flow cat
- Magnaflow rear muffler + Lukey Ultraflo resonator
- Shift-I progressive shift light
- Custom ECU tune
- Air box delete (custom) with BMC airfilter
- 10c degree STAR thermo fan mod
- FireStorm igntion coil booster
- 5 Bar fuel pressure regulator
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post #9 of 10 (permalink) Old 06-13-2019, 02:29 AM
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722.6 has two speed sensors mounting on the conductor plate inside the transmission.
Your car might come upon a damaged sensor thus causing you to have RPM reading errors or fault codes.

Whenever your transmission module cannot read or compare the RPM from the turbine sensors,
AT will act strangely, later, and finally, lose control over gear shifting.
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post #10 of 10 (permalink) Old Today, 05:55 AM Thread Starter
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I've had a friendly mechanic who works with the AA come out and run a proper diagnostic check, we've also checked the tcm for oil but unfortunately found none. Apparently these codes make the conductor plate speed sensors a less likely cause and I'm concerned the issue is in the box, although any opinions you have on this would be great. the new obd read out is below.
Maybe these could indicate a torque converter but my only real reason for thinking this is that it's a cheaper part than the gearbox. I was quoted £1980 for a installed reconditioned box but this seams very expensive, what's your opinion on a non-reconditioned second hand box from a scrap yard?

Many thanks
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