K40 relay circuit and associated - Page 3 - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
#21 (permalink) Old 03-10-2008, 02:40 PM
BenzWorld Member
 
Mercedes Mechanix's Avatar
 
Date registered: Sep 2007
Vehicle: 1914 Mercedes 28/95 hp, 83' 300SD, 93' S420, (three) 94' S420's, 95' S500 & 96' S600
Location: West Germany
Posts: 284
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Remark on Post previous!

Good explain there Bazle,
Agree 120%, if you check door seat adjustment panel switches as well... you will find a low wattage solder iron will correct all of the woes there too. Cracked solder joints are the maladay of the majority of electrical accy control issues/woes most will encounter in these vehicles.well....., besides the ecological/enviro. wiring insulation decision... sorry from a couple retired Benz Engineers!
Dietrich...

HHmmmmm, actually I will go and kick the H___ out of Robert for you! He was one of the several main Electrical/Electronic/CAN meatballs! I am more Frame and Mechanical, etc. And heck, seems Dutch was a bit of everything, think he turned the switch on for the place years ago... sorry D

Quote:
Originally Posted by Bazzle View Post
Its the current flow to the fuel pump. The orig soldered joints probably cracked (not an uncommon occurance) and the joint resistance increases. This is then a progression of heat, oxidisation etc until the soldered joint fails.

Bazle

retired 32+ years: Mercedes Benz Technician
Sinndelfingen Facility

Ein gut aufrechterhaltener Mercedes wird ebenso ruhig laufen wie eine Nähmaschine viele Jahre lang!
Mercedes Mechanix is offline  
Sponsored Links
Advertisement
 
#22 (permalink) Old 06-22-2008, 05:47 AM
BenzWorld Newbie
 
Date registered: May 2006
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Great post!!!last week i had the same trouble codes, p1525 p1235 p1236, I checked k40 and i discovered it was in the same conditions, resoldered and supercharger started working again.
lot of saved money!!!!
topgun78 is offline  
#23 (permalink) Old 07-15-2008, 11:32 AM
apf
BenzWorld Junior Member
 
Date registered: Jul 2008
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
K40 Module - The F4 fuse (40 Amp)

In the diagram they say the big 40 Amp fuse (F4) is for the air pump. The fuel pump just uses a 15 Amp fuse (F5). So the source of heat should be the current for this "air pump".
Question:
As far as I know the 230 does not have an air pump. Yet, still this big fuse is there in the K40 module. Is is not used or what?
apf is offline  
#24 (permalink) Old 08-19-2008, 01:25 PM
BenzWorld Junior Member
 
Date registered: Jul 2008
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This thread saved me thousands.. I had thes same error codes and found and solderred the k40 switch points. After driving my SLK230 for about 2 weeks, I now have a problem with starting the car. The dashlights will glow when the key is turned but the engine will not crank. I found a workaround that is hardly acceptable.. I have to disconnect the battery for an hour, then reconnect the battery - wait another hour and the engine will now crank. I've replaced the batteries in the key, rechecked the k40 relay and also centered the ignition key collar. The dealer says it might be the Crank Position Sensor. I have found that mentioned in one posting, but wonder if anyone else has experienced this???
davidm1020 is offline  
#25 (permalink) Old 01-10-2009, 12:11 PM
BenzWorld Junior Member
 
antmez's Avatar
 
Date registered: Mar 2008
Vehicle: 1999 SLK 230 Silver With AMG Bodykit and Blue Designo interior
Location: UK
Posts: 43
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
had codes p1525 , p1236 , p1235 , p0370,

MB dealer got these codes for me and said that it was not my supercharger as i thought and that it was either the ECU or the wireing going to it,
They then told me that the best way to fix this was to leave the car with them for 3-4 hours and they would check every wire for breaks and if it was not that they would have to get me a new ECU ,
So as you can imagine not cheap, so i decided that i would have a think about it and get back to them.

After searching through this forum i came across this post , so i checked the K40 circuit board and found the burnt out connections,
quick solder, 2 minutes later and a very loud scream. car and supercharger were running like they should.

so the question is , did MB know this was the problem and were they just trying ro rip me off,

either way i'm happy and a big thanks to everyone who posts on this forum!!!

Ant
antmez is offline  
#26 (permalink) Old 02-18-2009, 09:02 PM
BenzWorld Member
 
Date registered: Dec 2008
Posts: 58
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by antmez View Post
had codes p1525 , p1236 , p1235 , p0370,

MB dealer got these codes for me and said that it was not my supercharger as i thought and that it was either the ECU or the wireing going to it,
They then told me that the best way to fix this was to leave the car with them for 3-4 hours and they would check every wire for breaks and if it was not that they would have to get me a new ECU ,
So as you can imagine not cheap, so i decided that i would have a think about it and get back to them.

After searching through this forum i came across this post , so i checked the K40 circuit board and found the burnt out connections,
quick solder, 2 minutes later and a very loud scream. car and supercharger were running like they should.

so the question is , did MB know this was the problem and were they just trying ro rip me off,

either way i'm happy and a big thanks to everyone who posts on this forum!!!

Ant
i've been told the very same thing. that my supercharger's linings are clogged and they want me to pay 2500 to fix it. i really think it's the k40, so i'm gonna take a look at it this weekend. i have a feeling they're just trying to rip me off. if you guys have any suggestions, i would really appreciate it if you took a look at my post and try to solve my problem.. thanks!

here it is:
http://www.benzworld.org/forums/r170...e-do-what.html
ayobonus is offline  
#27 (permalink) Old 02-18-2009, 10:50 PM
BenzWorld Junior Member
 
antmez's Avatar
 
Date registered: Mar 2008
Vehicle: 1999 SLK 230 Silver With AMG Bodykit and Blue Designo interior
Location: UK
Posts: 43
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
check your k40 first,

2 mins to fix and free

Ant
antmez is offline  
#28 (permalink) Old 02-19-2009, 10:17 PM
BenzWorld Newbie
 
Date registered: Feb 2009
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
would this k40 resolder work on a 1998 c230?
thanks in advance
locofta is offline  
#29 (permalink) Old 02-21-2009, 12:20 PM
BenzWorld Member
 
Date registered: Dec 2008
Posts: 58
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by antmez View Post
check your k40 first,

2 mins to fix and free

Ant
checked my k40, and it's perfectly fine. i don't know what else can cause the non-starting issue. it might actually be the key and the ignition.
ayobonus is offline  
#30 (permalink) Old 03-17-2009, 05:56 PM
BenzWorld Newbie
 
Date registered: Mar 2009
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I would like to thank all for this post. Just saved me tons of money considering I had to fix mine and it took no time to do it with with this forum. Thanks again all.
tg2008 is offline  
Reply

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R170 SLK Class


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

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome