ml 320 transmission computer - Mercedes-Benz Forum

Go Back   Mercedes-Benz Forum > Mercedes-Benz Vans/Trucks/SUV/Others > W163 M-Class
New User? Register - Forgot Password

BenzWorld.org is the premier Mercedes-Benz Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 04-03-2008, 01:15 PM   #1 (permalink)
BenzWorld Newbie
 
Date registered: Dec 2007
Posts: 2
ml 320 transmission computer

My first post so bear with me. I have a 1999 ml320 with 114,000 miles. I purchased the truck used, about 5 months ago, with 108,000 miles. Carfax records show that the truck was dealer maintained up until March of 2007 and also indicate a transmission fluid flush at 99,000 miles. Recently the truck has been going into limp home mode, and only goes in 2nd gear. If I
turn the truck off, and then back on, it drives fine for a while, but eventually
goes back into limp mode. Generic obd scanner (autozone) gives a code of p0700, transmission control module. I took the truck to the dealer for diagnosis. They told me that the computer pointed to a problem in the valve body and that they could replace it but it might not solve the problem. They reccommended that I replace the transmission and ETC control module. ($7,889.22 +tax). WOW, (I said it louder than you). There is a merchant on Ebay who has remanufactured ml320 transmissions (tranzparts). According to the dealer, if I buy a remanufactured tranny, the computer that I have will not work with it. The dealer says that the ETCs are married to the transmission that they came with. He says I would have to buy a new computer and have it programmed by them. Is this true? The merchant on Ebay says it is not true. I know he just wants to sell a remanufactured transmission but you would think that since they rebuild them, they would know and would require the ETC be returned with the core if indeed they were inseperable. Any thoughts or suggestions would be appreciated.
sholmes5631 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-03-2008, 01:58 PM   #2 (permalink)
BenzWorld Extremist
 
Solidjake's Avatar
 
Date registered: Feb 2008
Vehicle: 99 ML430 - 02 330i
Location: Queens, NYC
Posts: 1,097
Send a message via AIM to Solidjake
i can't help you with that. hope someone can answer that. gl
__________________
Solidjake is offline   Reply With Quote
Old 04-03-2008, 04:52 PM   #3 (permalink)
BenzWorld Elite
 
Date registered: Aug 2002
Vehicle: Black 2005 ML 500
Location: Galveston, TX
Posts: 1,662
ml 320 transmission computer

Check your transmission fluid level and your battery/charging voltage, which are the basic steps you need to do first, before going to the MB Stealer.

Get a second opinion, the TCM is just a transmission controller that can be updated without the need to replace the ETC on ML's. Transmiission controllers are known to fail if the battery voltage is too low (in many vehicle brands, not just MB). The battery/charging voltage gets even lower when you try to start your vehicle, so the TCM may not be able to initialize correctly, so you may want to check your battery/charging state. If it is old and under specs, change it first.

Now you have a 1999 model, which had so many design and quality part issues/problems that Mercedes will not work on that transmission at all. They will replace it with a newer updated one, which may require so many other updates that they can string you for a lot of money..

Though what you need is an honest expert mechanic who understands MB transmissions and the electronics.

A well trained honest mechanic will understand/diagnose your transmission and electronics and find what is the real root of the problem is. they will not just change transmissions and controllers blindly.

Hopefully it will not be your transmission... Though ML's are known to have a whole set of issues (earlier and late models), and all of them are expensive with the MB Stealers...

AC
__________________
2005 ML 500
Black, 18" AMG Wheels, 285/60R18 Yokohama Geolander HTS + Bi-Xenons(+ Drew's e-code mod, though the reflectors rusted off and do not give out much light anymore), Yakima roof bars, Akebono pads all around. Former vehicle 2001 ML 320 with 108K miles, when traded, and a large repair/defect history. After all these years of owning my current 2005 ML 500, it is a major unreliable vehicle with a very large/expensive repair/defect history and has been like this since brand new.
AC_ML is offline   Reply With Quote
Old 04-03-2008, 06:17 PM   #4 (permalink)
BenzWorld Elite
 
Date registered: Aug 2006
Vehicle: 02 ML320
Location: Bronx, New York
Posts: 10,542
Code P0700 relates to the wiring harness that runs from the transmission computer to the transmission. Absent the fact that the harness is actually damaged, what this means is that the electrical plug at the transmission is giving a false signal to the computer, because it is possibly contaminated with trans. oil.

Read the PDF below and it will giveyou a good idea of this ongoing problem because of a faulty O-ring on the plug. If there is no oil contamination at the plug then I would say that you need to have the conductor plate changed, which is attached to the top of the valve body.

You do not need computers, or a valve body or a transmission.
Attached Files
File Type: pdf Transmission O ring Leak.pdf (534.3 KB, 1444 views)
43sqd is offline   Reply With Quote
Old 04-03-2008, 09:43 PM   #5 (permalink)
BenzWorld Newbie
 
Date registered: Dec 2007
Posts: 2
Thanks Solidjake, AC_ML, and 43sqd for your responses. Thanks to this forum I have tried most of your suggestions. The charging system is O.K., the tranny has been serviced twice in the last 2 weeks by technicians attempting to diagnose the problem, so the fluid is new, and before i took the car to the dealer, I did the electrical connector guide replacement myself. There was contamination in the female side of the plug so that when I sprayed it with electrical connector cleaner and let it drain, it ran out black. After spraying it 2 or 3 more times it finally ran out clear. I dried it with an air blower before reconnecting it. I took the truck for a test drive and it drove well. It did not go into limp mode within the first 25 miles of stop and go driving where before it would go into limp mode within 5 miles. Just as I was about to declare victory, limp mode. Thats when I decided to take it to the dealer.
But 43sqd got my hopes back up when he said P0700 refers to the wiring harness. Even though I cleaned the connector at the transmission and also the ones connected to the computer underneath the dash board, is it possible that the wiring harness itself was shorted out by the oil in the plug and needs to be replaced? No one has ever suggested that. It seems worth a try considering the alternatives. But how do you replace it and where can I buy one, besides the dealer. Is it a DIY?
sholmes5631 is offline   Reply With Quote
Old 04-04-2008, 05:28 AM   #6 (permalink)
BenzWorld Elite
 
Date registered: Aug 2006
Vehicle: 02 ML320
Location: Bronx, New York
Posts: 10,542
Be resigned to the fact that you will have to go to the dealer and get the correct parts. Don't start shopping on line for these parts since they are vin specific.

Print out the technical bulletin and go to the parts dept. at the dealer and ask for the repair kit for this problem. The part number on the bulletin has probably been changed to a new number, but I do not have it. You will just have to be guided by what M/B tells you.

Before you go there, remove the 13 pin plug again and inspect for more fluid at the connector. Also strip the wire loom from the harness and inspect and clean all wires. Check for any softness at each wire. It's obvious that the problem lies at the plug or the wiring at the plug, so investigate thoroughly before purchasing anything.
43sqd is offline   Reply With Quote
Old 12-07-2008, 10:05 AM   #7 (permalink)
BenzWorld Junior Member
 
Date registered: Sep 2007
Vehicle: 2000 ML 320
Location: Pennsylvania
Posts: 6
i think im experiencing this problem now, i have codes 0700 and also 0715 pending and went into limp mode earlier today. i notice a light covering of oil on parts of the under carriage, my question is this. exactly where is this plug located and what parts would i need to buy in advance to attempt to fix this? its very cold outside now so i just wanna make sure i have everything i need before i start anything, thanks in advance for any help

Quote:
Originally Posted by 43sqd View Post
Code P0700 relates to the wiring harness that runs from the transmission computer to the transmission. Absent the fact that the harness is actually damaged, what this means is that the electrical plug at the transmission is giving a false signal to the computer, because it is possibly contaminated with trans. oil.

Read the PDF below and it will giveyou a good idea of this ongoing problem because of a faulty O-ring on the plug. If there is no oil contamination at the plug then I would say that you need to have the conductor plate changed, which is attached to the top of the valve body.

You do not need computers, or a valve body or a transmission.
LexLuger is offline   Reply With Quote
Old 12-07-2008, 12:59 PM   #8 (permalink)
BenzWorld Elite
 
Date registered: Aug 2006
Vehicle: 02 ML320
Location: Bronx, New York
Posts: 10,542
The part that usually leaks is the 13 pin connector which is on the right side of the transmission. If it is found to be leaking, remove the connector and spray both ends with Brake Cleaner and then blow dry with shop air. Then take it for a test drive to see if that clears up the problem.

If it does then go to the dealer and purchase the connector and related seals.
Attached Files
File Type: pdf Trans. 13 pin Connec. Leak.pdf (534.3 KB, 1114 views)
File Type: pdf Trans. 13 pin Connec. Blow up.pdf (1.10 MB, 960 views)
43sqd is offline   Reply With Quote
Old 12-07-2008, 06:41 PM   #9 (permalink)
BenzWorld Elite
 
Date registered: Feb 2006
Vehicle: 1999 ML320
Posts: 22,545
Quote:
Originally Posted by sholmes5631 View Post
... The dealer says that the ETCs are married to the transmission that they came with. He says I would have to buy a new computer and have it programmed by them. Is this true? ... Any thoughts or suggestions would be appreciated.
You have found the number design problem with the 722.6 transmission. A simple O-ring failure can lead to thousands in repair cost.
mlfun is offline   Reply With Quote
Old 12-15-2008, 11:33 AM   #10 (permalink)
BenzWorld Junior Member
 
Date registered: Sep 2007
Vehicle: 2000 ML 320
Location: Pennsylvania
Posts: 6
i found some oil in the connector and cleaned that. i cleared my codes (0700 & 0715 pending) and tried to drive it....it seems to take a second for the gears to engage when shifting from park into reverse or drive and the shifting is really erratic. the most common problem is the 1st to 2nd shift - with normal acceleration right before it SHOULD upshift the rpms get a sudden burst then it shifts. didnt really get to check the higher gears as i was hesitant to take it out on any roads where i can go fast enough, i just been stickin to driving around the nieghborhood in case somethign went drastically wrong. so my question is now that i read the codes again, the only thing i get is 0715 pending again, which i read could be conductor plate issues. is there anything else i should look for or try in order to isolate the exact problem?
LexLuger is offline   Reply With Quote
Reply

  Mercedes-Benz Forum > Mercedes-Benz Vans/Trucks/SUV/Others > W163 M-Class

Bookmarks



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Topic Author Forum Replies Last Post
Transmission and/or Computer problems ronf119 W202 C-Class 14 05-08-2013 02:05 AM
transmission computer? RK430 W208 CLK Class 0 04-01-2008 01:01 AM
ML-320 Computer Program for Microsoft Windows FixMyBenz W163 M-Class 6 12-21-2007 01:55 PM
320 CDI Oil Computer? nips W209 CLK Class 0 02-12-2007 10:40 AM
Ml 320 trip computer help joseph s schmitz W163 M-Class 4 01-20-2007 03:54 PM


All times are GMT -7. The time now is 06:57 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.1

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.