Mjolinor Posted June 19, 2024 Share Posted June 19, 2024 Yes that is the one. Where did you find the one you have listed above? Quote Link to comment Share on other sites More sharing options...
RonS Posted June 19, 2024 Author Share Posted June 19, 2024 48 minutes ago, Mjolinor said: Yes that is the one. Where did you find the one you have listed above? https://www.mercedesmedic.com/reset-mercedes-benz-transmission-procedure-instructions/ Someone online had stated that this was also applicable for the Smart Quote Link to comment Share on other sites More sharing options...
Mjolinor Posted June 20, 2024 Share Posted June 20, 2024 Cheers. That's a new one on me and it surprises me that it works. I do know that the smart and the CLK have the same bits almost but the smart has no kickdown switch. Every day a school day. Quote Link to comment Share on other sites More sharing options...
Mjolinor Posted June 20, 2024 Share Posted June 20, 2024 Hmm, that procedure is not about reteaching the gearbox it is about erasing the memory in the control units. You achieve the same by disconnecting the battery for a few minutes. I shall do ti on mine today and see what happens. Quote Link to comment Share on other sites More sharing options...
RonS Posted June 20, 2024 Author Share Posted June 20, 2024 1 hour ago, Mjolinor said: Hmm, that procedure is not about reteaching the gearbox it is about erasing the memory in the control units. You achieve the same by disconnecting the battery for a few minutes. I shall do ti on mine today and see what happens. What's puzzling me is why I keep having to do this. Hopefully I can manage to drive it to the garage on 25th who can sort it out! Quote Link to comment Share on other sites More sharing options...
Willys Posted June 20, 2024 Share Posted June 20, 2024 I know this is or sounds like a broken stupid record but, have you checked every grounding point that you can find related in any way to this issue or in general...???? These cars seem to be very prone to issues with poor grounds. Just because the pile of eyelets look good you need to take them off the grounding pin and clean them if not just check between each eyelet. Ask me how I learned this simple fix. I would never have accepted this as a reason for such a problem until it proved it was the case. No not this problem, but one that I was certain it was something expensive and was very close to purchasing the sensor to solve the problem. Just a thought is all..... Quote Link to comment Share on other sites More sharing options...
RonS Posted June 20, 2024 Author Share Posted June 20, 2024 24 minutes ago, Willys said: I know this is or sounds like a broken stupid record but, have you checked every grounding point that you can find related in any way to this issue or in general...???? These cars seem to be very prone to issues with poor grounds. Just because the pile of eyelets look good you need to take them off the grounding pin and clean them if not just check between each eyelet. Ask me how I learned this simple fix. I would never have accepted this as a reason for such a problem until it proved it was the case. No not this problem, but one that I was certain it was something expensive and was very close to purchasing the sensor to solve the problem. Just a thought is all..... Thanks for the thought - it's appreciated. I will look into this for sure - one reason being a couple of years ago we had the exact same problem (engine wouldn't turn over / click only) at a petrol pump . A new battery cleared this problem for good until these recent instance . I bought another new battery to see if this would fix it this time but to no avail (and tests seem to show the two year old battery is just fine) . So I'm not discounting some sort of "bad / noisy " power supply due to a bad earth could be the issue. Maybe the battery was OK two years ago, too!. It's doing my head in and my wife has actually lost all confidence in the car - a gar we have always referred to as a "great little car" to friends...... Quote Link to comment Share on other sites More sharing options...
RonS Posted June 28, 2024 Author Share Posted June 28, 2024 On 6/20/2024 at 1:33 PM, RonS said: Thanks for the thought - it's appreciated. I will look into this for sure - one reason being a couple of years ago we had the exact same problem (engine wouldn't turn over / click only) at a petrol pump . A new battery cleared this problem for good until these recent instance . I bought another new battery to see if this would fix it this time but to no avail (and tests seem to show the two year old battery is just fine) . So I'm not discounting some sort of "bad / noisy " power supply due to a bad earth could be the issue. Maybe the battery was OK two years ago, too!. It's doing my head in and my wife has actually lost all confidence in the car - a gar we have always referred to as a "great little car" to friends...... I checked the grounding as best I could but the actuator itself failed completely on one of the test runs. Not changing at all - all reset procedures just ended up with no transmission / drive at all.Just prior to complete failure I was in the situation were I selected reverse and the car actually drove forward! Unfortunately at the end of the day I had to get the actuator replaced (it was seized) and I went for the OEM part so my wife can gain confidence in the car again. Thanks for all the useful suggestions - it was appreciated. Hopefully plenty miles left in the car...... Quote Link to comment Share on other sites More sharing options...
Mjolinor Posted June 28, 2024 Share Posted June 28, 2024 So you never bothered to strip it and clean it as shown in the video or you did do that and it failed afterwards? Quote Link to comment Share on other sites More sharing options...
RonS Posted June 29, 2024 Author Share Posted June 29, 2024 17 hours ago, Mjolinor said: So you never bothered to strip it and clean it as shown in the video or you did do that and it failed afterwards? I didn't do it eventually . I'd bought the required socket set and was looking to purchase the ramps but my wife just wanted to get it fixed at a garage. I honestly believe if I'd done your suggestion at the very beginning I would have saved myself the cost of a buying a new actuator but she was very concerned it would slip again in major traffic or something. So thanks for your advice - I think you were 100% right and I'd recommend to anyone to follow your video and save a good few hundred pounds (I'd rather not say exactly how much......) Quote Link to comment Share on other sites More sharing options...
Mjolinor Posted June 29, 2024 Share Posted June 29, 2024 It aint my video. Just the first hit on Google. Quote Link to comment Share on other sites More sharing options...
Willys Posted June 29, 2024 Share Posted June 29, 2024 54 minutes ago, Mjolinor said: It aint my video. Just the first hit on Google. I just watched the video and it shows it's not that hard to take it apart unlike the 450 with is riveted and once you disturb the case it's damned hard to get it back together correctly. But the 451 is semi easy except loosening the 3 bolts to get the actuator off as they seem very rusted as usual and there is a strong chance they could snap if you forced them and not carefully went back nd forth using penetrating fluids etc to help get the bolts out. I snapped my first one and I did all I could to get it out, using penetrant and also heat. As for repositioning the actuator when re-installing it, simply push it against the clutch fork or arm in the bellhousing. BUT, the best way is using a STAR like the guy in the video did. Good luck an semi easy job if you have all the tools required. To each their own..... Quote Link to comment Share on other sites More sharing options...
Mjolinor Posted June 29, 2024 Share Posted June 29, 2024 I have never had a seized one. They come apart easily. You do not just touch the arm when you replace it, you adjust it to touch then move it three marks on the push in bit. There is a scale on there for you. If you do that carefully they do not need adjusting at all, at least on the half dozen or so that I have done. There is a really strange self adjusting thing in the arm. Quote Link to comment Share on other sites More sharing options...
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