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 05-06-2011, 02:20 PM
Registered User
 
Join Date: Nov 2007
Location: Los Angeles
Posts: 27
M104 Pin8 Code21,22,23

Aside from the connectors, sparkplugs and coil. What other part can cause this codes? Can it be voltage regulator or battery?


Car idles good. No fluctuations during idle, constant 800rpm.

Reply With Quote
  #2  
Old 05-08-2011, 10:24 AM
Registered User
 
Join Date: Nov 2007
Location: Los Angeles
Posts: 27
VR culprit

Thank you for the advice A.D. !
We found the VR as the culprit for the codes.
Reply With Quote
  #3  
Old 05-30-2011, 05:36 AM
Registered User
 
Join Date: Oct 2008
Location: 1993 300E 2.8L M104
Posts: 152
hey tankwagon,

could you be a bit more specific

were all three codes(21,22,23) showing up together at the same time, or would they come up individually? and how often were these codes appearing?

the voltage regulator that you are referring to , is it the one located on the back of the alternator, or is there another one of these VR's located elsewhere?

could you please provide the testing procedure, and any other useful details?

thanks
Reply With Quote
  #4  
Old 05-31-2011, 07:52 AM
Registered User
 
Join Date: Mar 2006
Location: Australia
Posts: 115
Is that the VR or the OVR?
Reply With Quote
  #5  
Old 05-31-2011, 03:56 PM
Registered User
 
Join Date: Nov 2007
Location: Los Angeles
Posts: 27
VR = Voltage Regulator

Codes 21,22,23 all showed up at the same time. Voltage across battery (engine running) was below 12.6volts. Interstate MTP Battery was new.
Inspected the voltage regulator (back of alternator), the bushing were worn down. The VR was replaced. After VR was replaced, voltage across battery (engine running) was at 13.8volts. Codes were cleared. It's been 6 months , no codes 21,22,23.

Used Voltmeter to test voltage.

Hope this helps.

Last edited by TankWagon124; 05-31-2011 at 05:14 PM.
Reply With Quote
  #6  
Old 05-31-2011, 07:35 PM
Registered User
 
Join Date: Oct 2008
Location: 1993 300E 2.8L M104
Posts: 152
hello tankwagon,

thanks for the reply . I'm sure your info will come in handy sooner or later.

in the following link there are a list of symptoms/engine components that can be affected by a bad VR, resulting in too high a voltage:
Reasons to change the W124 Alternator brushes/V regulator!


just out of curiosity, at what mileage did the faulty VR/Low voltage problem arise?



thanks
Reply With Quote
  #7  
Old 05-31-2011, 08:46 PM
Registered User
 
Join Date: Nov 2007
Location: Los Angeles
Posts: 27
214,000miles. It has the Original Alternator. Further inspection on the alternator showed bearing was still good, only the VR brushes that are worn down. Since replacing the VR brushes, no codes 21,22,23.
Reply With Quote
  #8  
Old 05-31-2011, 08:53 PM
Registered User
 
Join Date: Mar 2006
Location: Australia
Posts: 115
Many thanks Tankwagon!
Reply With Quote
  #9  
Old 06-02-2011, 06:59 AM
Registered User
 
Join Date: Oct 2008
Location: 1993 300E 2.8L M104
Posts: 152
thanks again for the info.

found out a few additional things:

according to the FSM alternator voltage output should be in the 13V-14.5V range, no more or no less.

Unfortunately i couldnt find all of the minimum brush lengths for the 300E, which supposedly has 3 different alternators: 55A, 70A, and 80A. However i did manage to find out that the 55A alternators have a minimum brush length of 5mm, but am not sure if the same applies to the other 2 alternators? So, if any one knows , please post the info.

thanks to all

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 05:11 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, 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