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It seems the 38-pin diagnostic connector was removed in 2000 on the SLK 320, am I correct?

The reason I ask is because I paid an online MB help site to answer a weird fault code issue I am having and was told by a 20-year experienced MB technician I needed to connect to the 38-pin connector and not the 16-pin connector my scanner was plugged into on our 2001 SLK 320.

Some sites I've looked at say both connectors are implemented others like this one indicate the 38-pin connector was dropped. I searched under the hood for the round 38-pin connector he described in the fuse box on the USA driver's side and in the electrical box on the passenger's side (pictures above) and only found a round hole there where the connector probably was located on older models. I expect I received bad advice even though I clearly gave him the correct year and model.
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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Thanks, I guess I wasn't very clear, the ODB port you mention is the 16-pin connector I plug my scanner into; the car has no check engine light and all of the MB monitors have run and are stable, however, I am getting the same u0500 and u0900 fault codes others have been reporting with the SLK 320 here and on other sites. The technician seemed to be saying trying to diagnose from the 16-pin port was not reliable, really not sure now what his point was.

I have a state inspection coming up and have no idea what these codes mean or how to correct them. I am a retired computer hardware designer so I know a little about buses and when I combined that with all of the data or lack of data I've been able to find on the various sites regarding u0500 and u0900 fault codes in MB's I was assuming when I contacted the help site that my scanner was causing some kind of bus issue reporting codes MB does not use, etc..
 

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Premium Member 2001 SLK200K/2001 SLK320
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My first Q. would be "what scanner are you using?" as those codes that you have given (U0500 and U0900) are generic codes and not present on the MB Codes list. Suspect that you might need to beg, steal or borrow a better or more dedicated scanner.

As an observation, and if wiki is to be believed:
2000 FaceLift
Production for FaceLift models began after February 2000. Major changes include:
<snip>
SLK230 Kompressor engine updated, SLK320 introduced, and SLK200 Kompressor replaces SLK200 and now introduced for worldwide market
<snip>
That shows that the 320 was introduced as a 2000 post FaceLift .. several major changes , blah blah ..

The FaceLifts have never had the 38-pin OBD as far as I know and as the 320 was introduced post FaceLift .. it stands to reason that your 2001 FL 320 has always been OBDII 16-pin
 

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Discussion Starter #5
M4rCu5 thanks for the response....

I have an older version of the INNOVA 3140; the version before they added a software update USB port, a scanner going all the way back when it came with support for OBD2&1. We have several vehicles going back a few years before OBD2 and I have use this scanner on them all without any issues up to now. Because others are reporting u0500 and u0900 faults on their SLK I was thinking on the SLK some scanners might be doing something wrong on the bus.

If you are familiar with this scanner model you may remember it includes three LEDs as well: RED = the car will fail inspection, YELLOW = it may fail, and GREEN = it will pass. With no check engine light on and all monitors running to successful completion these two codes are turning the YELLOW LED on; I guess I'll just have to take it in like it is.
 

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Premium Member 2001 SLK320/2000 SLK230
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Both my '00 230 (prefacelift) and '01 320 (post) have the 16 pin US OBD connector by the steering column and can use for in-depth diagnostics. Believe the US required in '96 but Europe did not get until this century.

Both Torque Pro and my Autel Diaglink with Benz module work just fine.
 

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Registered 2002 R170 SLK V8 5.0
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Hi,

Agreed that you will only have 16 pin DLC.

Regarding "U" (unclassified) Codes, again agreed that you need a better machine, personally I don't really use anything other than SDS on Mercedes Cars, even older ones, and with the SLK you have the added complication that some modules actually need HHT Win Emulator which is only supplied with SDS.

Even really good Generic machines, (£900 Autel, Snap On Solus Pro, Bosch KTS etc) will not "access all modules / all codes" and they cost multiple times the price of a decent SDS plug and play system.

Mercedes often need items "Version Coded" as well, again, Generic Machines do not do this ;)

BTW, I don't sell SDS, but I wouldn't work on MB's without it.

SDS gets more use in my Workshop than any of my other Dealer Level Machines, for example the BMW kit hardly ever gets used because Snap On is very good with BMW, but pretty poor on MB's, Peugeot Planet / Citroen Lexia gets used more than Generics because none of my 3 Generics are very good on Pug / Cit's etc etc etc

No single machine except dealer level, will ever do everything, and cheaper machines are often very misleading due to you not being able to see the full picture :wink:

HTH,

Cheers Dave
 

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Discussion Starter #8
Dave - thanks for the response.

From what I have found searching the internet on these codes I had concluded in general valid "u" fault codes were related to some issue on the bus, thanks for the correction.

I know you are not in the USA but do you know what level equipment the various countries use when doing inspections. From what you and some others have said perhaps the codes will not be detected during an inspection with their systems; will know soon and report what happens here.

The old 2001 SKS 320 is the only MB we have but it is the favorite car of one of the family members so I need to keep it on the road as long as possible.

I still need an ODB1 tool for even older vehicles we have like a 1995 Ford Lightning pickup; the current tool has been useful on it and a couple of others.

At my age playing with cars is mostly a thing of the past. I personally drive a 2007 S2000 Honda roadster most of the time because it kind of makes me feel younger running through the gears.
 

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Premium Member 2001 SLK320/2000 SLK230
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SDS - Star Diagnostic System

Agree to a point. If you need something that can raise and lower windows or isolate cylinders then you need more than a $100-$200 device.

OTOH $5 fror Torque Pro and a $12 dongle is more than most have and is a good data logger.

For a R171 and later then the $40 Carly Pro for Mercedes is the best deal.

In the $100-$200 range you get into the handhelds. These can interrogate the internal modules. Personally I like the Autel products (have a DiagLink with several modules) and do not care for the iCarSoft (did it ever get PC logging ?).

Then around $400 you start getting into the professional tools.

ps In General any code that ends is -00 is a generic code that indicates there is a deeper code in one or more modules that must be read.
 

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Registered 2002 R170 SLK V8 5.0
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A basic C3 based SDS installed on Dell, Plug and Play, (hand picked and sorted system) can be had for £399

It will likely pay for itself on the first 2 complex faults, and you'll be able to sell it for the same as you paid for it if you no longer need it. "Turnkey" working systems command a premium on EBay as a lot of DIY guys do not want the hassle of needing to do Keygens or play the Chinese Lottery.

I bought my first 2014 system off a previous Benz owner for that very reason. I now have that and a C4 Online 2017 version on a silly fast D630 with 8GB RAM 2.4Ghz Processor and SSD. That baby can go on line too, as do a lot of my Dealer Levels :)
 

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Discussion Starter #11
For anyone interested our SLK 320 passed the State inspection this morning; the u0500 and u0900 faults caused no problem.

Because I've seen these codes on our SLK 320 and reading several others have seen them as well I'll keep scanned the chats to see if anyone ever gets a handle on them. In my case I will just assume it was some kind of issue with the ~$400.00 scanner I have even though I am not sure what it could do to report these faults; I had assumed scanners only reported bus errors and faults stored by the MB computer, apparently there is more to it.

Thanks again to all responders....
 

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Registered 2002 R170 SLK V8 5.0
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Hi,

Glad your Car passed OK :)

Does anyone near you have SDS ?

I would love to see the print out of a "Quick Test" which will interrogate all Modules.

Thing is this, those 'U' Codes that your OBD Reader is getting are likely a fault that is being communicated, via the CAN, to a Module that the OBD can actually see, ..................

For Example, an ABS or Trans Code will get communicated to ME ECU etc, so the Techie needs to see a report from all Modules to determine exactly where the fault lies :wink:

One of us here would then likely be able to tell you exactly what the problem is by reading the whole report ;)

If there are absolutely no lights on the Dash and everything appears to be working fine, then it is likely a very minor fault or an old fault, but none the less there is, (or has been), something going on there :wink:

For peace of mind and to prevent a possible expensive failure later on I personally like to know exactly what is what with my own MB Car collection :nerd:

HTH,

Cheers Dave
 

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Discussion Starter #13
Dave,

Interesting input. I think you are saying my tool is really reporting stored fault codes, I was wondering how my scanner would just make them up. This leads to a question; with a recommended MB tool would it also be report these faults leading the technician to print out the "Quick Test" you mention to determine what caused it since he would find no other stored faults in this case?

Right now I know the SLK320 needs engine mounts and that is way out of my area of support these days so I'm hoping to talk her into trading the SLK320 before another inspection is due or we have a major problem. I don't know anyone with an SDS tool other than the dealer, however, I have looked at the MB SDS tools recommended and will certainly consider one if she goes for a new MB.

regards,
Jim
 

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Registered 2002 R170 SLK V8 5.0
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Hi Jim,

What I am saying is :-

1) They may be old codes, or they may be current

2) The codes old or new are transmitted from another module to ME ECU and your scanner is picking them up from ME ECU but doesn't know what they are or where they came from.

3) SDS will report everything in every module un-like most machines, and it will tell you if they are Current or Historic, and also show data, guide you to the problem plus much much more !!

Imagine trying to look through your letter box and trying to see what is going on in the whole street, you can only see a glimpse of a small piece of what is really happening ;)

SDS would be like viewing your entire street with X ray vision from a Helicopter !!

HTH, Cheers Dave
 

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Discussion Starter #15
Ok, that clears up a confusion I've had about scanners.

Now that we have passed maybe I'll clear them out and just see if they reoccur.

I mentioned the engine mounts but with over 175,000 miles on the old girl I know they are only one item needing attention; I'm trying to build a case to replace her even though the car still looks like new.

regards,
Jim
 

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Registered 2002 R170 SLK V8 5.0
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Hi,

Your Scanner will likely only clear the CAN Comm Error Codes in the ME, it will almost certainly not clear the Actual Code in the "whatever module" that it can't see, so that Module will keep transmitting the codes via CAN and it will just keep re appearing, this is what confuses even the average Garage Mechanic !!

Hell even some Main Dealer staff do not understand this.

I'm not just saying it for the fun of it ;) SDS is the only machine for MB's, unless you have a very high end Workshop system which will cost many times the price of a Dell based C3 SDS, and even one of the high end Generics, (I have 3 different ones), will not do everything the Dealer Level Machines will ;)

I have many different Marques Dealer Level Machines now, for all the popular makes on our roads up here, plus 3 good Generics ............. Snap On, Delphi and Autel Pro

HTH, Cheers Dave
 

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Registered 2002 R170 SLK V8 5.0
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Hi,

The point with that 58 quid OKI is that all you are buying is an interface, you still need a Laptop with the DAS /Xentry s/w and for Cars of the R170 era I don't think it will access all modules, it even says it has no K Line Compatability, the R170 has to use DAS with Win HHT Emulator to get into a lot of modules.

Perhaps anyone who has one could confirm whether it accesses stuff like Vario Roof, ATA, PSE etc, and if so will it do version coding ?????????

BTW I do have, and do understand what a J2534 pass-thru device is, but I simply do not think from what I have read that this will do everything on MB's of this platform.
A car with Full CAN maybe ;)

So Consider the cost of the good used D630 / D620 laptop, a charger, likely a new battery, at least 4Gb RAM Cards, and then a decent HDD (or SSD) with s/w and I reckon the turnkey system all loaded up on a Dell complete with 16 pin lead and a decent C3 Mux is a much better option for a DIY'er at £399

The 32 pin lead can be purchased separately and is not expensive.

If you are a software expert you can spend hours and hours downloading a free version, and have all the keygen and other hassle that goes with it etc etc.

A fully sorted plug and play jobbie from a UK & USA diagnostic equipment seller is far better IMHO than buying from Ali Baba and the 40 thieves, or trying to do it yourself.

I built a lot of my Dealer Level kits for different makes, including my current 2017 C4 System, although this one I bought the HDD pre loaded ;)

Tbh unless you are really good with upgrading laptops, (BIOS and RAM etc) and also software expert, (which I am only mediocre at), then the MB system, also BMW System and one or 2 other marques will be a real bear ;)

A working SDS WILL pay for itself over and over and re sell for at least what you paid for it if you were sensible and didn't get ripped off ;)

I have no affiliation with this company apart from a very satisfied customer that has bought several Dealer Level kits, they are still doing their entry level SDS at £399
Stores in USA and UK.......................

I hope it isn't against rules to post the link, mods please feel free to delete if it is :-

https://www.obdstore.co.uk/product-category/manufacturer-specific/page/4/

Cheers Dave
 

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Discussion Starter #20
Well she is looking seriously at a very low mileage used 2016 SLK 300 as a replacement for the old 2001 SLK 320. The car is very nicely equipped with the sports package with 18'' AMG wheels, etc. I was surprised to find it only had a 4-cylinder engine, however, in researching this engine online I find it has a very good record overall and because it is turbo charged somewhat more powerful than the 320 V6.


Does anyone have experience with this engine?

thank,
Jim
 
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