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Wire #27 is not another feed wire. It is the actuation wire for the Coolant Cir. Pump which runs continuously when the eng. is running and a few minutes after the eng. is shut down. It is working properly.
If everything is in order, then there is no other explanation other than the AAC Module being faulty. You can remove the AAC completely and remove the T7 Torx screws and inspect the board on both sides for any circuit damage.
If you own your own shop, it would be easy for you to borrow an AAC from a junk yard and try it, 84 89 or 02 89.
OK, thanks for all your help, Maj. Dundee. Unfortunately 164 is not really dime-a-dozen, and we don't see too many of them out on the road here -- much less in junk yard. You mentioned about updated part number for the AAC, I'm wondering if there's any TSB?
OK, thanks for all your help, Maj. Dundee. Unfortunately 164 is not really dime-a-dozen, and we don't see too many of them out on the road here -- much less in junk yard. You mentioned about updated part number for the AAC, I'm wondering if there's any TSB?
You never included where you live in your profile, so I have no idea where 'out here' is.
Here's an update to the 9006 AC Compressor has Short Circuit problem. The Xentry Tips document was dead-on. The problem was much more on the software issue than any ground connection, although ground check is always a necessary step. I had the software in the original AAC control module updated (to version 2519022200 from original version of 2514420405) AND compressor control valve swapped to the old/original part. Beware to any of you who owns 164 (M-class) or 251 (R-class) vehicles with AC cooling output problem and fault code 9006 -- do not replace AC compressor or AAC control module prior to checking grounds, power, wires, and AAC software update. I learned my lesson. I'm a bit lucky actually, because the old compressor was making horrible noise anyway when I decided to replace it. Even if you want to replace compressor, buy from reputable part vendors only. I suspected my new compressor had cheap/bad/incompatible control valve.
Haha but of course, beer and chicken wings for Maj. Dundee for exemplary, outstanding dedication helping out fellow gearhead in tough times, and for making this forum not suck.
Hi,
im wondering if it’s possible that you run this code for me. My research Tells me I need a system update because the part number for my differential Pressure Sensor was changed and the part must be calibrated to match. This code according to the dealer says that the particulate filter will not regenerate, They want me to pay more than 3k to replace it, but can’t explain why but The car doesn’t show any of the symptoms that they indicate should be happening to the vehicle.
My car is running normal. It was going into limp mode and a couple other things before we changed the DPS. We ran the code that came up at the time and once it was replaced with the new part all the issues went away but this new p2626 code came up. P2626 did not initially show up, it only surfaced after the part replacement. My MB II scanner says this is not a valid MB code. But the dealer said the particulate filter will not regenerate.
im seeking assistance b/c the dealer refuses to try the update. I refuse to pay that kind of money for something that my research tells me is not necessary and expecially when they can’t explain why my car is not acting up in any way or showing any of the symptoms that should be occurring if the particulate filter was not working
Im probably one of few women that does her research on her cars bfr taking it in b/c I don’t want them trying to get over on me..I don’t understand why they won’t just do what I ask them.. Btw I found your post while researching intermittent AC issues and was pleased to see someone take the time to really help, so I’m hoping you can help me to. Just in case u need my vin number it’s 4JGBB22E78A429466. I do have a question about the AAC module update. Is that a software update as well? If so how can I get these dealers to just do the updates as requested. I told the guy if the update doesn’t work than we can move on.. Thanks
I replied to the. Wrong person at first
Yes the light is on .. they are saying I have to replace the diesel particulate filter.. the part along cost 2000-2500..they say it’s not regenerating .. there are no symptoms...my engine run great. No limp mode, great gas mileage..
Yes the light is on .. they are saying I have to replace the diesel particulate filter.. the part along cost 2000-2500..they say it’s not regenerating .. there are no symptoms...my engine run great. No limp mode, great gas mileage..
Well, let's put it this way, if you live in the USA you have no alternative but to correct the problem because it will fail annual inspection.
Try driving it for 20 - 30 miles without letting the engine revs fall below 3,000 rpm. Best if you use the paddle shifters to keep the revs as high as possible.
I have 2006 W251 with 9006 fault code. This tread has the best info on this problem to date. I have had intermittent 9006 for the last 18 months. I keep code reader in car and reset when I get 9006 and AC stops. I have not changed out anything yet due to the mixed result and confusion around this issue. It makes sense that you need right software level and matching AC control valve. Mine is original and I am thinking I just need software update
Yes the light is on .. they are saying I have to replace the diesel particulate filter.. the part along cost 2000-2500..they say it’s not regenerating .. there are no symptoms...my engine run great. No limp mode, great gas mileage..
I asked about a computer update and was told that they didn’t have one or it wouldn’t take an update. But a couple days after the check engine light went off and hasn’t come back on. I can’t say what the remedy is for this but, the AC software update worked for me when I was having intermittent ac issues.
Need help with my 2008 ml320cdi 4matic. Same kind of intermittent AC malfunctioning
Originally Posted by Maj. Dundee
Here is an Xentry Tip specific to your problem. Pay attention to "the year" as there are different procedures.
Hey Maj. Dundee + mbz community,
I noticed that you are well versed in the diagnosis or Mercedes' like the w164. I was hoping to reach out to see of you, or someone else on this thread, may be able to help me out. I have a 2008 ml 320cdi 4matic and in the US. Bought it used, AC was working at first, then started having intermittent issues, and now doesnt even really work. Sometimes it would start right up and blow cold air, and sometimes it would take 30mins-1hr to start blowing cold. Sometimes while driving and ac working and blowing cold, it would stop blowing cold and change to warm humid air. Issue has been getting worse and worse. I had it looked at by a shop, and they are telling me it is the compressor and that i basically need to replace the whole system. I just wanted to do more research before i go ahead and spend the $2400 they are asking. Is there anything else that i can do to ensure that it is indeed the compressor and not something else? Going to take my car back for now until i can be sure its the compressor. Any thoughts?
I saw that TSB, and yesterday i took the kick panel off and brushed the W29/2 nuts/round clip. The 9006 short circuit error is not there anymore after I put it back together. However, i am *not* 100% sure if it was me accidentally clearing the fault with my MBII, or it really went away. So i drove about 20 miles yesterday after the 9006 gone - the code did not come back yet. The AC felt a bit better, and it blows 65F instead of 69F before i clean the W29/2 connection point, but it is still not cool enough. I believe it should be blowing out 45F if it runs properly.
I hooked up the AC Gauge last night again and it still reads 55 PSI on Low / 160 Psi on High.
From the TSB, i believe the W16/4 ground point is only for newer cars (based on the YoM 07/1 which i believe stands for July 2010+) so i did not look at the W16/4 since that looks like it requires a 1 pin to 2pin conversion.
I have also found a few posts where people talking about hooking up a diode to a ground with 1N4007 - but i have not yet tried this yet. I am waiting to see if the 9006 comes back. If it doesnt come back, then i would like to believe my brushing on the W29/2 worked, and it no longer has that short.
The next thing i want to try is to replace the control valve on the compressor.
01-29-2018, 07:06 AM
