Semi newbie with a new car and a new problem with supercharger on an SLK

JSeaman

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Hi all,

I haven't been around here for quite a while but just got a new toy tonight, it's a 98 SLK 230 (170) and is in much better shape than I was expecting, no rust on any arches and pretty reasonable all round. It was way too slow though so I just had a quick look in the dark and found a 2 pin connector to the supercharger which I guess actuates the clutch, fired 12V in and it clicked so I went for a quick spin and it was much better.

My question to your collective selves is what triggers the clutch and can you accelerate my fault finding process?

Thanks

James
 
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JSeaman

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Just had a quick check and I have +12V on one of the pins to actuate the supercharger so the other (presumably a switched ground) isn't triggering
 
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JSeaman

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OK after a bit of searching it sounds like I need to pull the K40 module and resolder it or potentially the ECU has a dodgy FET (BUK101 50DL), on we plod ...
 
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JSeaman

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So tonight's update - I figured the K40 wasn't responsible because I have the +12V at the supercharger clutch but I decided to whip it out anyway and resolder it. Looks brand new so I guess has been replaced.

Whilst I was there I checked the ECU fan and it wasn't working, popped it out and put it on a power supply and it fired up just fine. After reworking the K40, checked for voltage and the pins had +12V, plugged the fan in and it's back in action. Not sure if it was just moving wires around or the K40 rework that did it so I'll keep an eye on that.

Just awaiting my FETs and then I'll pop the ECU out and hopefully sort the clutch out properly, fingers crossed!
 

Conor

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Cool.. I like a nice techie challenge like this.

In times gone buy I used to tinker with electronics and enjoyed.
 
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JSeaman

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:) Needs must and all that, I'm hoping my FET arrives today so I can (hopefully) finish it off
 

grahamcol

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Good luck with your new toy. I have a R170 230K too and love it to bits.
 
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JSeaman

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Thanks, it was a bit of an impulse buy but I'm quite liking it. Sadly the transistor didn't come in the post so no more fixing today but I can spend some time on the other you (grinnal Scorpion) instead
 
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JSeaman

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Well the FET arrived, didn't make any difference, now waiting for my 38 pin adaptor so I can have a go at pulling out error codes :(
 

Bopo

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Blimey, that's a hell of a lot of diagnostics to start with. Good work and welcome to the forum.

Maybe move your ongoing work to another thread on the forum so it is easier for other people to find and follow your excellent advice?
 
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JSeaman

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:) Well thanks, I would normally knock up a guide but I'm not seeing a happy ending to this one. If I do reach a conclusion then I'll certainly pop it all together - thanks for the welcome!
 
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JSeaman

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Finally resolved, just an AFM
 
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JSeaman

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Air flow meter, also called a mass airflow sensor, mass airflow meter, airflow sensor and various other things! It's the meter of air entering the engine and was covered in oil, no doubt PCV system will need a look at next
 
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