MBWorld.org Forums

M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Air charge sensor help

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Jul 27, 2019 | 06:34 PM
Share
  #1  
Towmater's Avatar
Towmater
Thread Starter
Member
 
Joined: Mar 2019
Posts: 145
Likes: 14
Ml350 bluetec
Air charge sensor help
My air charge sensor b17/8 is reading -50c. I replaced it and it reads the same. There are no issues on the other sensors. I have continuity from the sensor plug to pin 53 at the ecu. The sensor is about 1.89k ohms at 100f. Sensor unplugged I get 3.3v on the line from pin 53. With the sensor plugged in I get 1.89v. Plugged in or not it reads -50c

Ml350 bluetec 2010, with a tune, so no codes thrown. No can bus codes in the modules either.

At this point I'm thinking its within the ecu itself and that I should send it out for board repair. Does that sound right?
Reply
0
Old Jul 28, 2019 | 01:43 AM
Share
  #2  
Maj. Dundee's Avatar
Maj. Dundee
MBWorld Fanatic!
 
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
No it doesn't sound right.

If there were no codes, why would you change this sensor?
Reply
0
Old Jul 28, 2019 | 12:03 PM
Share
  #3  
Towmater's Avatar
Towmater
Thread Starter
Member
 
Joined: Mar 2019
Posts: 145
Likes: 14
Ml350 bluetec
Originally Posted by Maj. Dundee
No it doesn't sound right.

If there were no codes, why would you change this sensor?
I have found with my ecu tune, there are no codes. (Edit, no codes from the engine control portion, like no check engine lights) So when it wouldn't go into boost I looked for sensors that feed that circuit. The only value that looked wrong on my scanner was the air charge sensor at -50 when it's at least 100 deg outside.
Last edited by Towmater; Jul 28, 2019 at 12:05 PM.
Reply
0
Old Jul 28, 2019 | 02:45 PM
Share
  #4  
Towmater's Avatar
Towmater
Thread Starter
Member
 
Joined: Mar 2019
Posts: 145
Likes: 14
Ml350 bluetec
Oh man, this gets weirder. Fuse 101 is blown and when replaced blows again.
Reply
0
Old Jul 28, 2019 | 10:01 PM
Share
  #5  
Maj. Dundee's Avatar
Maj. Dundee
MBWorld Fanatic!
 
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Originally Posted by Towmater
Oh man, this gets weirder. Fuse 101 is blown and when replaced blows again.

Here is what this fuse controls, red box.
Attached Files
Reply
1
Old Jul 29, 2019 | 12:11 PM
Share
  #6  
Towmater's Avatar
Towmater
Thread Starter
Member
 
Joined: Mar 2019
Posts: 145
Likes: 14
Ml350 bluetec
Dropped off at the indie. I'll update if/when repaired. Also given the fact I dont get codes I might get asecond stock ecu to pop in when I have issues to make it easier to trackdown.
Reply
0
Old Jul 29, 2019 | 12:30 PM
Share
  #7  
Maj. Dundee's Avatar
Maj. Dundee
MBWorld Fanatic!
 
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Originally Posted by Towmater
Dropped off at the indie. I'll update if/when repaired. Also given the fact I dont get codes I might get asecond stock ecu to pop in when I have issues to make it easier to trackdown.
You might be barking up the wrong tree. That fuse controls two other components and either could be causing the fuse to blow.
Reply
0

Trending Topics

Old Jul 29, 2019 | 01:35 PM
Share
  #8  
Towmater's Avatar
Towmater
Thread Starter
Member
 
Joined: Mar 2019
Posts: 145
Likes: 14
Ml350 bluetec
Originally Posted by Maj. Dundee
You might be barking up the wrong tree. That fuse controls two other components and either could be causing the fuse to blow.
MB world Fanatic indeed. you are right. I was able to see on the OBD side instead of going into the canbus modules the charge air temp actually reads something reasonable. Im using a foxtool scanner. When I put in a new fuse it seemed to work until it blows again, when it blows it like freezes the data, kinda? Now this time my map sensor reads 36.95 psi at idle, (4 when unplugged). I then disconnected my swirl motor in case it was that. The fuse didnt blow on the way to the indie and I didnt get black smoke, but It was way down on power. and the map sensor still read some bogus data.

My guess is there is a short somewhere.
Reply
0
MB World Stories

The Best of Mercedes & AMG

story-0

Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

 Verdad Gallardo
story-1

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
story-2

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

 Verdad Gallardo
story-3

Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

 Verdad Gallardo
story-4

Mercedes EQS Gets A Major Update: Everything You Need to Know

 Verdad Gallardo
story-5

5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

 Verdad Gallardo
story-6

Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

 Verdad Gallardo
story-7

10 Most Reliable Mercedes-Benz Models You Can Buy Used

 Verdad Gallardo
story-8

Mercedes Teases Updated EQS With Steer-By-Wire and a Yoke

 Verdad Gallardo
story-9

8 Mercedes Models With Poor Reliability Records

 Verdad Gallardo
Old Jul 29, 2019 | 01:51 PM
Share
  #9  
Maj. Dundee's Avatar
Maj. Dundee
MBWorld Fanatic!
 
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
I'm trying to help you but you do not refer to the cooling fan or the O2 sensors that can cause the fuse to blow.
Reply
0
Old Jul 29, 2019 | 01:58 PM
Share
  #10  
Towmater's Avatar
Towmater
Thread Starter
Member
 
Joined: Mar 2019
Posts: 145
Likes: 14
Ml350 bluetec
Originally Posted by Maj. Dundee
I'm trying to help you but you do not refer to the cooling fan or the O2 sensors that can cause the fuse to blow.
correct. I ran out of time (I also have a newborn), before I took it to the mechanic. The cooling fan was operating correctly, but I did not check for a short on the 02 sensors, which could very well be shorted. I am still very grateful for your posts and the community.
Reply
0
Back to Subforum
M-Class (W164)
View Next Unread
2006 ML350 Door Actuator

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


You have already rated this thread Rating: Thread Rating: 0 votes, average.
Show Printable Version
Email this Page

Advanced Search

All times are GMT -4. The time now is 03:08 PM.

story-0
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-1
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-2
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-3
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-4
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-5
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-6
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE
story-7
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE
story-8
Mercedes Teases Updated EQS With Steer-By-Wire and a Yoke

Slideshow: The 2027 update adds a fully digital steering system, revised styling, and potential charging upgrades as the company looks to revive interest in the luxury EV.

By Verdad Gallardo | 2026-04-04 10:24:38


VIEW MORE
story-9
8 Mercedes Models With Poor Reliability Records

Slideshow: From problematic air suspensions to early dual-clutch transmission issues, these specific models and years stand out as the least dependable modern Mercedes vehicles.

By Verdad Gallardo | 2026-03-26 18:08:10


VIEW MORE