Mercedes ML320 CDI poor cold start. Fault finding and repair.
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- Опубликовано: 2 авг 2024
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Hi
This W164 with the OM642 engine, came to me with several issues!...
On this video, I will be tackling the poor cold start...
The owner replaced all the 6 glow plugs, and despite the improvement, still hard to start when cold...
On the engine ECU, the error code 2270-4...
Follow me on this video to find out what was the problem and how to resolve it.
Hope you enjoy the video.
Any questions or comments put them below.
Like always, thank you for watching! 
Авто/Мото
Nice job. Same problem since one year. Mercedes changed one injector they tought to be the cause (800€...) without any result. Went to different mecanics, nobody able to find...when I see your video, I'm amazed by mecanics incompetency in my region. I will finally get the das/xentry tool and check it by myself following your steps. Would love to have a mecanic like you here...
Also have issues with external temperature indicator (goes up to 60°c when wet), airconditionning, airmatic front suspension leaking...not the best reliable car but love it so much 😅
The exterior temperature it is very important... as it might dictates if and for how long the glow plugs are activated...
If it is showing too hot it might prevents the glow plugs from working...
There is obviously other parameters that the ecu looks at, and without looking into functional descriptions I am not sure, but I would definitely fix that first...
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Absolutely, that's what I was thinking about when writing my comment, I will start investigation on that first 👍👍👍
Do you provide online assistance for DIY owners to help identify and solve misfunctions? Of course I'm willing to pay for it 😊
I do what I can here... for more...
www.patreon.com/LMAutoRepairs?
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Nice video . You even showed the bus waveform which should be interesting for people to see . Like you said , pretty straight forward but you took the long way around . Much appreciated Luis .
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Thanks!
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Another fantastic job and everything is proved, not just guessed as a lot of workshops do. Well done :)
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Thanks!
For watching and for your comment!
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good thorough diagnostics. I learnt afew things. Thanks as always
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Thanks!
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splendid work as always.
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thanks for the videos, always something interesting, and far better to learn from someone else's experience as we don't have to spend time or money ..
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A shame some people does not see it that way...
Thanks... for watching and for your comment!
I like the way you diagnose 👍🏻
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Thanks!
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Thank you for another great video!!!
Can't believe you couldn't sort the old module :)
Thanks!
Hello Nemanja are you from Balkan
@@Luka-ov1hu Yes, from Serbia.
Next level stuff. Awesome skills 🎉
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Thanks!
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Great vids. Do you have wiring diagram at all for this and is there anyway to force the module to work. Keep up the great work
Very good
Keep doing this
Thanks!
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Nice repair video 👍
Thanks!
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And like always.. tkanks for sharing 🙃
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Thanks 🙏
Sehr gutes Video, endlich kann ich das verstehen was auf dem Laptop steht, ist auf deutsch :-)
auch auf dem Steuergerät steht Vorglühsteuergerät :-)
Morning everyone👍🏻
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Morning
Great work did it stop it smoking on start up 👍
Yep...
That smoke was just the unburnt fuel from the few cranks without starting...
After this was perfect!
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Hi, ich habe das Glühkerzen Steuergerät getauscht habe trotzdem kaltstart probleme! was kann es sonst sein? mein mechaniker hat einen neuen injektor eingebaut und trotzdem startet er nicht. erst beim 2. mal
Always easy to beat big problems.........🥳🥳🥳
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Hi, can we contact you for work if we have an issue with our car? I live close by.
Hi, How can I contact with you regarding ML ignition damage?
Thanks
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Good job🥇🥇🥇🥇🥇
Thanks!
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buen video. Disculpa en donde compraste tu osciloacopio.
eBay at the time...
Bought it years ago...
Thank you for watching!
I've been having the same issue for over a year... I have replaced the glow plugs twice and the relay but it still does the same thing. It's starting ok just now because the temperature is going up but I'm out of options for it? No codes either... I only have stored codes relating to the pedal position sensor.
Have you checked powers and grounds to the module?
Have you checked LIN bus to the module?
Have you checked that the glow plugs are being activated?
Have you checked live data?
I would resolve that pedal fault as well... as it might be influencing the starting of the car...
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since that was the only problem if the unit was very expensive this could have been fixed by using the signal of one of the working outputs to a relay and driving the 4 other outputs with the extra relay. Not sexy but would work for old crappy cars with expensive unit
Yes... it would work...
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I done all that replace the glog module and still have the same problem car takes a few seconds to start and blow out white smoke any idea what else is causing that thanks
Hi
Any codes stored?
Have you checked, wiring from module to glow plugs?
Main voltage supply to glow plug controller?
Powers grounds and LIN bus to the glow plug controller?
Glow plugs, have you also replaced them?
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Is it easy to change the glow plugs , num 2 & 4 on my ml 320 are not good , should I replace all of them to be sure .?
I would replace them all...
Best practice.
But you can leave the ones that still work...
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Perfeito
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Obrigado!
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So the glow plug module was at fault & not the plugs am i right ?
I thought the video was clear enough...🥺
What's the name of the module? What to ask for at mercedes? Thanks
Glow plug controller...
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Great video.. just a question
You had the glow plug light ON after start the car?
No...
The glow plug light stays on for a few seconds after the engine started if there is an issue with the glow plugs...
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@@LMAutoRepairs I tested the glow plugs and they are all working properly!... it's hard for the car to start when it's cold.. the light stays on for a few seconds after start the car.. In winter the car just doesn't start..
Have you tested the controller?
Have you scanned the car?
The scanner doesn't show any errors....
That's strange... but test the controller output... if is not sending anything to the glow plugs, there most likely a bad controller...
Hi, could you please tell me where to buy this type of needle for pins, a link will help me very much, thank you 🙏
Have you tried places like ebay?
Search for "multimeter probes"
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Thanks 🙏
Hi friend.may I know which software name in Panasonic laptop?
Probably Star
Correct...
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how much is the module cost.
Was around £80 or so...
Ring mercedes and ask...
Ebay is a good place to look as well...
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Hi!
I would have opened the box too. Just wondering if anyone managed to fix one with problems. What goes wrong in that circuit?
Thank you for sharing your work
I know the old ones have an internal independent fuse for each glow plug... if the plug shorts burns the fuse... and even though the old module are also not serviceable, you can open them and solder a new fuse... I know cause I have done them...
This one, couldn't see any fuses... I still believe that the module disables the output to the glow plug... either my DAS was is not really setup to reset them, or there is something else that I not aware of...
Thank you for watching and for your comment!
@@LMAutoRepairs i managed to repair one of these on e220 cdi w211 facelift , i soldered those frog laps as you called ,thus saving a few quid.
Lucky you...
As I mentioned on the video, this was all good... wish that was the issue with this one... unfortunately was not...
Thank you for watching and for your comment!
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You can tell immediately that the glow plugs are either switched off or aren't working by the sound of the engine why do they have to have modules for everything why not just powers and ground like they used to have for glow plugs
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They are used in other circumstances on newer cars... not just during cold start...
I guess to probably make them to work more effectively during those times...
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@@LMAutoRepairs that's kinda strange because they seem to run fine once started I'd say the real reason is so that people can't fix them that easy especially on diesel cars diesel pollut a lot
Having a separate module for the glow plugs is good engineering, otherwise a shorted glow plug will take-out a more expensive ECU $$$.
@@joeluang8695 Oh that makes sense but why do they still use them once the engine is started
I have a video coming on a BMW explaining that... I know this is a mercedes, not a BMW... but most likely the principle will be very similar if not the same... stay tuned...
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What piercings using you, please
What do you mean?
@@LMAutoRepairs think he is talking about the wires you were sticking into the connector maybe? And maybe the probe with the bulb in
@@Infiniti25 maybe he’s asking where to get his ears pierced 😂
Hey couldn't you not use a heat sensor, or thermal sensor to see who gets hot on a cold day ?
What do you mean?
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@@LMAutoRepairs the glow plugs, point the thermal camera at the side of the engine that has the glow plugs and it might of shown 3 glowing instead of 4, I never tried just a thought
I guess it would...
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I think the module is dead especially from where it is placed on the engine
For sure it doesn't help...
ruclips.net/video/GPJCWX_HMYk/видео.html this video shows what the problem inside the glow plug control module and what wires needed to be replaced to fix it with buying a new part.
Only if this was the issue in this case...
If you watched the entire video, you have seen that the issue in this case was something different....
And just in case you wonder, even though I mentioned it in the video, I measured the glow plugs circuits with faults, from the pin to the pcb, checking ok, so the "frog" wires were all good...
Actually, would have been an easy repair if these wires were the issue...
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Thank you for watching and for your comment!