#    #  
 #    #  
 #    #  
  #  #   
   ##    
         

         
    ###  
   ##    
  #####  
   ##    
   ##    
   ##    
         

         
         
 #    #  
 #    #  
 #    #  
 #   ##  
  ### #  
         

         
### #### 
 ##  ##  
 ##  ##  
 ##  ##  
 ######  
     ##  
 #####   

 ______  
(  ___ \ 
| (   ) )
| (__/ / 
|  __ (  
| (  \ \ 
| )___) )
|/ \___/ 
         

IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now.


Visit Preferences to set your user name
Summary of change:
The Mercedes Benz M103 engine is a 6 cyl engine and uses three teeth on the flywheel, each 60 degrees wide, leaving a 60 degree window between them. There is a single inductive/VR sensor of 830 Ohm to sense these teeth, the sensor wire has only one conductor with a shield. '''Which is proper to use as ground and which is signal? I'm looking for the correct polarity.''' I could just connect the signal and try it out live, but I have a few days until the fuel system is complete so I would like to investigate first if possible. ---- Notes : The primary trigger input on the ECU has a 1k pulldown, lm1815pin5=5V The scope image below shows the signal picked up by the sensor while cranking at about 200 rpm. The ground of the probe is connected to the shield of the sensor wire. It is unknown which edge of each "tooth" is at TDC for each cylinder, but one of them is. If I'm not mistaken, the polarity will matter to get the correct edge to occur 60 degrees before TDC. http://www.vems.hu/files/MembersPage/MattiasSandgren/Trigger/merc-m103-trigger.png More on the engine here: http://en.wikipedia.org/wiki/Mercedes-Benz_M103_engine
Optional: Add document to category:
Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.