Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-01-2011, 11:25 PM
thayer's Avatar
Mercerator
 
Join Date: Oct 2008
Location: Mt. Airy, NC
Posts: 891
what is this strange box with a knob on it? 1995 E320 wagon

So I was digging into the dash of my e320 wagon trying to "fix" my combination stalk when I came across this strange box with a knob on it



timing reset? magic mpg increaser?

__________________

77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
Reply With Quote
  #2  
Old 02-02-2011, 12:00 AM
compu_85's Avatar
Waiting for his Model 3..
 
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
I think that's what's called the MAS relay? I believe it's related to the fuel pump.

-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
Reply With Quote
  #3  
Old 02-02-2011, 12:10 AM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Correct, a MAS relay, the knob is for removing the relay.
Reply With Quote
  #4  
Old 02-02-2011, 12:13 AM
Registered User
 
Join Date: Dec 2006
Location: beautiful Bucks Co, PA
Posts: 961
I noticed the same when I had the dash apart on my '95 E320 wagon. I thought it was related to the security system.
Reply With Quote
  #5  
Old 02-02-2011, 02:16 AM
MBeige's Avatar
Registered User
 
Join Date: Apr 2005
Location: SoCal
Posts: 3,746
The MAS relay is supposed to be behind the battery IIRC. If this is under the dash, it might be a similar looking device.

But first thing comes to mind is the MAS relay for me too. This controls the fuel pump, among other things.
Reply With Quote
  #6  
Old 02-02-2011, 08:25 AM
thayer's Avatar
Mercerator
 
Join Date: Oct 2008
Location: Mt. Airy, NC
Posts: 891
Too bad...no magic

engine control unit.
Attached Files
File Type: pdf 15-2193.pdf (95.7 KB, 123 views)
__________________

77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
Reply With Quote
  #7  
Old 02-02-2011, 09:19 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Not a MAS relay unit!!

That is the ODB1 diagnostic module that records check engine information.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #8  
Old 02-02-2011, 11:38 AM
compu_85's Avatar
Waiting for his Model 3..
 
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
Cool What fuel injection system would a 95 E320 have? Are they LH Jetronic or were they still CIS?

-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
Reply With Quote
  #9  
Old 02-02-2011, 12:01 PM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
HFM-sfi

Hot Film Management
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #10  
Old 02-02-2011, 04:00 PM
Starstruck
 
Join Date: Mar 2009
Location: Iceland
Posts: 423
I'm going out on limb here but i guess your car is a California version of E320 and this a diagnosis control unit with the part number A0155454332. Just shoot me if i'm wrong.
__________________
600SEL '91
300E 4Matic '88
240D '83
280SE '77
350SE '73
The most complex systems can fail in the simplest way.
Contra verbosus noli contendere verbis, sermo datur cunctis, animi sapientia paucis.

i don't believe in the lord! He's never bought me a Mercedes Benz.
Reply With Quote
  #11  
Old 02-02-2011, 04:31 PM
compu_85's Avatar
Waiting for his Model 3..
 
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
Quote:
Originally Posted by mbdoc View Post
HFM-sfi

Hot Film Management
sfi = sequential port injection in this case?

Does the fuel injection computer also control the ignition system?

-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
Reply With Quote
  #12  
Old 02-02-2011, 05:17 PM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Yes, & Yes
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #13  
Old 02-03-2011, 12:44 AM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Yes & No, it is a 104 with SFI, but the ignition was not integrated until ME-SFI

BTW the LH-SFI and HFM-SFI are essentially the same, the only real difference is the mass airflow sensors, the LH being hot wire, and HFM being hot film.

I wouldn't argue about the control unit until I saw where it is. Based on where I believe it is I still think it's a MAS, MBdoc could be right, it's definitely not the engine control module though
Gilly
Reply With Quote
  #14  
Old 02-03-2011, 12:47 AM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Quote:
Originally Posted by thayer View Post
engine control unit.
Oh I see what you are saying, no the MAS is not the engine control unit. MB can be very flaky on their descriptions, N16 is the MAS, which is NOT the engine control unit. In that drawing the engine control unit would be one of the larger control units towards the top of that drawing.
Reply With Quote
  #15  
Old 02-03-2011, 01:01 AM
compu_85's Avatar
Waiting for his Model 3..
 
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
Quote:
Originally Posted by mbdoc View Post
Yes, & Yes
So wouldn't that actually make this Motronic?

-J

Reply With Quote
Reply

Bookmarks

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 06:54 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page