K40 relay module - Page 2 - Mercedes Benz SLK World Forum
Mercedes Benz SLK World ForumSLKWorld.com The World's Premier Mercedes Benz SLK Community
 

Go Back   Mercedes Benz SLK World Forum > Mercedes Benz R170 SLK Class Cars > SLK R170 General Discussion
SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

SLKWorld.com is the premier Mercedes-Benz SLK Forum on the internet. Registered Users do not see the above ads.
Like Tree20Likes

Reply
 
LinkBack Thread Tools
Old 09-29-2008   #21 (permalink)
hp2
SLK World Junior Member
 
Join Date: Sep 2008
Location: Linden
Posts: 1
Country:
Chats: 0
Thanks: 0
Thanked 1 Time in 1 Post
Default

Just want to add my .02 on this K40 relay...I have a 2000 SLK that my daughter drives away at college...She called and states the car would have low power at times and the check engine light would come on at times...I'm in the automotive repair field and called the local MB repair shop for estimate of diagnosic after pulling the codes...They wanted $850 to $1500 because they stated by the time they got the car that far apart to find the issue...After joining SLKWorld and doing a search I found this wonderful article and inspected the car myself...15-20 minutes later I see the burnt soldier joints and resoldiered, fixed and the cost was zero!!!! Bazzle was right on... Codes were P1525, P1235, P1236, and P1420 in that order...
View hp2's Photo Album hp2 is offline   Reply With Quote Quick reply to this message
The Following User Says Thank You to hp2 For This Useful Post:
Sponsored Links
Advertisement
 
Old 11-29-2008   #22 (permalink)
SLK World Junior Member
 
Join Date: Oct 2008
Vehicle: 1999 Mercedes SLK 230 Kompressor
Posts: 2
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Thanks Bazzle!

Fixed my engine starter problems, exact same symptoms as millerpm in:
http://www.mercedesforum.com/m_103131/tm.htm

I owe ya!

View Huwee's Photo Album Huwee is offline   Reply With Quote Quick reply to this message
Old 04-06-2009   #23 (permalink)
SLK World Junior Member
 
Join Date: Sep 2008
Posts: 2
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default K 40 issue resolved

Bazzle,

Thanks for the information regarding the K 40 relay. My 1999 SLK 230 lost power last week. I found your informative repair notes. I purchased a new K40 relay for $157.00 USD, installed it and the SLK is back in full power. Thanks!

Quote:
Originally Posted by bazzle View Post
Early SLKs suffered from soldered joint failures on the K40 pcb. This mainly affects smooth op and fuel pump.

I have just repaired mine.

K40 Relay - Right hand drive

LHD opposite

Remove neg batt term
Remove computer lid
Unclip holding tang and lift up module
Pull off connectors
Open case of module
Inspect soldered joints for cracks, overheating, dry joint etc
An eyeglass may help (top left hand group of three)
Remove old solder and resolder with new
Replace module
Push on connectors
Remove and replace 40A fuse to wipe the contacts.
Replacelid
Replace neg batt terminal.
Start car

Redo radio code if required.

more: http://www.benzworld.org/forums/r170...ssociated.html

Bazzle
View dans22's Photo Album dans22 is offline   Reply With Quote Quick reply to this message
Old 04-09-2009   #24 (permalink)
SLK World Junior Member
 
Join Date: Apr 2009
Posts: 6
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Hi Guys, I am going to say that my SLK 230K 1998 has been in to Mercedes 3 times and they have had it over 2 weeks and in total i think i have spent well over 600 (lab and parts) to have this issue with intermittent starting and stopping fixed. First they said there was chafing of some cable on the undercarriage then changing the fuel pump. At no time have they mentioned this. I am furious. If i can find this on teh internet then why couldnt MB dealer (MB UK themselves) sort this out. It has been over 2 years and i have hardly driven the car 100 miles since (luckily it is a weekend or fun car). I am just about to see if i can repair this my self and if it is the problem, If it is i will be contacting MB and giving them a real earfull. Thank you Bazzle. I've had the car from new and its only done 32,000miles.

Thanks and let you know how i get on.
View Prabo's Photo Album Prabo is offline   Reply With Quote Quick reply to this message
Old 04-09-2009   #25 (permalink)
SLK World Junior Member
 
Join Date: Apr 2009
Posts: 6
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default Not respinding to Bazzle's solution. Fan keeps running!

Hi again,

Well i have checked out the k40 relay circut board as per Bazzles instructions. The three little soldered bits in the corner look fine no degredation at all, cant see any anywhere else either so have not touched teh soldering iron. I gave it a good blow and cleaned the 40A fuse and put it back in. I have tried re-starting it but cant get it to turn over.

My symptoms are exactly as described by Millerpim on the other thread ->

millerpim
Join Date: May 2008
Posts: 1


2000 SLK Ignition Troubles & Died at Light
For the past several months, when I turn the key in the ignition to start the car, nothing happens. No noise. No engagement. After 2 or 3 tries, which involve removing the key and reinserting it, it will engage and start. Yesterday, I ended up cranking the key 50 times or more before it finally started. Today, it fired right up, but after driving for 20 minutes and sitting at a light, it suddenly died while in drive. I put it in park and tried to start it. It did not start. After a couple minutes of fidgeting with the key and turning it over and over, it finally started. What could cause this?

In addition my problem seems to be that if i turn the key to position 2, the fan comes on immediately (even on a cold start) and keeps spinning at high speed nothing else happens if i try and turn to ignition no sound of it trying to turn over or anything.


--------------------------------------
Prab again -------> So having had a look at the circuit board and it looking ok. Is there anything else anyone can reccomend. I have lost faith with the dealers and just want to get her up and running again. Sicne i took the module out she has not started again but that was only 30 mins ago will try her again later.

HELP! Anyone? Much appreciated.
View Prabo's Photo Album Prabo is offline   Reply With Quote Quick reply to this message
Old 04-09-2009   #26 (permalink)
aka John

 
UK-C200's Avatar
 
Join Date: May 2008
Location: Richmond, Tx
Vehicle: LHD Black SLK350, LHD Firemist SLK55
Other Toys: Nacra F18
Posts: 12,980
Country:
Chats: 1143
Thanks: 1,698
Thanked 2,880 Times in 2,012 Posts
Default

Hey Prabo - have you read the codes from the car? Would be interesting to see what it's throwing out...
View UK-C200's Photo Album UK-C200 is offline   Reply With Quote Quick reply to this message
Old 04-09-2009   #27 (permalink)
Thread Hijacker
 
dmjonez's Avatar
 
Join Date: Aug 2008
Location: Kennesaw, GA
Vehicle: formerly 2001 SLK320, and 2006 55AMG. Shopping again.
Other Toys: MB E550 4matic, MB C300, Saab 9-3, PT Cruiser, Ram 1500, 737-700/800
Posts: 2,807
Country:
Chats: 1599
Thanks: 652
Thanked 781 Times in 401 Posts
Send a message via Yahoo to dmjonez Send a message via Skype™ to dmjonez
Default

By the fan, do you mean the heating/cooling fan in the cabin? If so, that's another issue and seperate from the other problems, but I know the fix. Give me a bit more info about that...
View dmjonez's Photo Album dmjonez is offline   Reply With Quote Quick reply to this message
Old 04-10-2009   #28 (permalink)
SLK World Junior Member
 
Join Date: Apr 2009
Posts: 6
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default Big fan behind the front grill of car. :-~

Big thanks guys.

1) Sorry no idea how to read the codes on the car. Do i need to take it to MB for that? Would be great to do it though.

2) By the fan i mean the Fan behind the radiator grill (radiator fan i guess)- the big round one that sits between the engine and just behind the grill at the front of the car. The fans inside the car used to come on when it first used to stall whilst driving (if the vents were on). But now when it fails to start or when it does stop whilst driving it is just this big fan under the bonnet.

Any help would be appreciated. Thanks for your time.

P
View Prabo's Photo Album Prabo is offline   Reply With Quote Quick reply to this message
Old 04-10-2009   #29 (permalink)
RTFM
 
Join Date: May 2007
Location: Southern Norway
Vehicle: 96 SLK 230K
Other Toys: Samurai
Posts: 946
Country:
Chats: 39
Thanks: 190
Thanked 205 Times in 146 Posts
Default

Did the fan go "crazy" after you checked the main board?
If so you should double check the connections. If the fan control (N76) http://www.buellwinkle.com/r170/comn76.htm doesn't get a signal when you turn on the igition the fan goes into a emergency mode. If connections ARE ok, you could have a problem with your AC control.
View Gabus's Photo Album Gabus is offline   Reply With Quote Quick reply to this message
Old 04-14-2009   #30 (permalink)
SLK World Junior Member
 
Join Date: Apr 2009
Posts: 6
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Thanks Gabus. Will take a look in teh morning is dark now. The fan has always gone crazy whenever the car suddenly stops or if i start it and it starts and stops or if it just does not turn over, eitehr way it suddenly comes on and teh fan keeps going. Then a few minutes or sometimes a day later i can start it and suddenly it works again for a while and then at some random time it all happens again.

The day i put the module back in it would not start at all (Coincidence i think) i could not see any broken solder it looked smooth and intact on the 3 connections mentioned by bazzle. But today 4 days later it suddenly started 6 times (i have not drvien it yet) and runs at standstill fine. Will take it out tommorow - fingers crossed. After i check the AC control N76.

ANy other ideas? Can i read the codes myself? How? Really need to get her out and make the most of the little sun we are likely to get this year.

Oh and also the roof is not folding down the switch lights up if i push in teh close direction but the open direction nothing happens no light flashing or anything? The car has not been drvien since last October. really should have taken her out more if it wasnt for this intermittent starting and driving problem. :-(

Thanks all,
View Prabo's Photo Album Prabo is offline   Reply With Quote Quick reply to this message
Old 04-24-2009   #31 (permalink)
SLK World Junior Member
 
Join Date: Jan 2009
Posts: 1
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default

wow!! just worked for me... thanks bazzle!!

took it to a merc dealer in sydney twice and they couldn't find the issue... but working well now thanks to you!
View slkOwner75's Photo Album slkOwner75 is offline   Reply With Quote Quick reply to this message
Old 04-25-2009   #32 (permalink)
SLK World Junior Member
 
Join Date: Apr 2009
Posts: 6
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default Intermittent failure to start

Dear Gabus,

Thank you. I checked the N76 - The connections appear ok - not sure on each cable though but the main block that goes in seemed fine. The fan is still going crazy but sometimes i can start it ok and the fan is fine and then 10 minutes later or another time i can try and start it and nothing happens except the fan going at high speed behind the radiator grill.

How do i check the codes? And what would be the first thing to replace given the above or should i trust Mercedes Benz again with it (again).



Quote:
Originally Posted by Gabus View Post
Did the fan go "crazy" after you checked the main board?
If so you should double check the connections. If the fan control (N76) http://www.buellwinkle.com/r170/comn76.htm doesn't get a signal when you turn on the igition the fan goes into a emergency mode. If connections ARE ok, you could have a problem with your AC control.
View Prabo's Photo Album Prabo is offline   Reply With Quote Quick reply to this message
Old 05-07-2009   #33 (permalink)
SLK World Junior Member
 
Join Date: Jul 2008
Location: Louisville, KY
Vehicle: 00' SLK 230 Copper Designo
Posts: 3
Country:
Chats: 0
Thanks: 1
Thanked 2 Times in 1 Post
Default

I wanted to thank this thread! I was getting some codes, checked this thread... went in expecting to do some soldering and found out one of the 5 15 amp fuses had blown. I replaced it and ol' murky is back to her original prowess. No codes!!

Thanks!
View shadetree's Photo Album shadetree is offline   Reply With Quote Quick reply to this message
Old 05-15-2009   #34 (permalink)
SLK World Junior Member
 
Join Date: May 2009
Posts: 2
Country:
Chats: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default K40 Module fix

I have a 1998 with 123,600 miles and suffer from the always on check engine light. I tried your method and thought it was going to work. Restarted the car and light went out, but the engine had a very bad miss. As I continued driving, the light went back on and the bad missing eventually went way, but when I floor the gas, it still hesitates quite a little. Dealer says that they can't read the comnputer and I get an "ERROR" when I try to read it with my device. I've been told I need a new computer mod, but I'm not sure I want to pay $1,700 plus labor for that fix. Can a used part be programmed to work with another car?
View daderenski's Photo Album daderenski is offline   Reply With Quote Quick reply to this message
Old 05-16-2009   #35 (permalink)
SLK World Junior Member
 
Join Date: Apr 2009
Posts: 6
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default Intermittent starting problem

Hi guys,

Just wondering if anyone has any suggestions on the above post i made.

Mainly How to read the codes and what to change considering i could not find any solder problems. Is it easier if i take pics of the module and show you?

Thanks for your time.

Prab
View Prabo's Photo Album Prabo is offline   Reply With Quote Quick reply to this message
Old 06-24-2009   #36 (permalink)
SLK World Junior Member
 
Join Date: Jun 2009
Posts: 1
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default Another success story

I just wanted to thank you for this very helpful thread. My car would die while driving for no reason every couple months and could not be duplicated. It finally would not crank yesterday and I found this thread today. This worked like champ! Thanks again
View TheRemedy's Photo Album TheRemedy is offline   Reply With Quote Quick reply to this message
Old 07-07-2009   #37 (permalink)
SLK World
 
glue_ru's Avatar
 
Join Date: Jul 2009
Location: Columbus, OH
Vehicle: 1999 SLK230 R170 / MT-AMG
Other Toys: Honda CR-V, computers, firearms, gadgets, wicked girlfriend
Posts: 54
Country:
Chats: 3
Thanks: 3
Thanked 2 Times in 2 Posts
Garage
Send a message via Yahoo to glue_ru
Default

it's a good tip, and those pictured solder joints are bad. A good solder joint should be smooth and well melted, not wrinkled and bad looking.
View glue_ru's Photo Album glue_ru is offline   Reply With Quote Quick reply to this message
Old 08-16-2009   #38 (permalink)
SLK World Junior Member
 
Join Date: Aug 2009
Posts: 3
Country:
Chats: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Default slk230 K40

Hello and thank you for the pictures and the post. I own a 1999 SLK230, the car often would not turn over, no ignition...nothing. All electricals would work, lights, top, windows even the engine fan...but the car would not crank...dead....I removed the k40 and cleaned the 3 spots witch were just like the pictures, I also cleaned the 40 or 45amp fuse and put it all back, the car started right up. I will order a new k40 as a back up just incase...thanks again for the help

Costa
View cpairways's Photo Album cpairways is offline   Reply With Quote Quick reply to this message
Old 08-16-2009   #39 (permalink)
FOUNDER - SUPER MODERATOR

 
Woolly's Avatar
 
Join Date: Jun 2006
Location: Co. Durham, UK
Vehicle: SLK350 MT
Other Toys: CLK 270CDI (Slushbox!!)
Posts: 15,991
Country:
Chats: 1297
Thanks: 2,799
Thanked 3,307 Times in 2,258 Posts
Garage
Default



Looking at those joints, I would say it's not poor soldering (the board appears to have been wave soldered anyway), but the component on the otherside of it overheating. What is actually attached to those pads?
__________________


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

MB SLK 350 Andradite Green (6 speed manual)

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


View Woolly's Photo Album Woolly is offline   Reply With Quote Quick reply to this message
Old 08-25-2009   #40 (permalink)
SLK World Member
 
Join Date: Aug 2009
Location: Long Beach, NY
Vehicle: 1999 SLK230 Manual
Other Toys: 97 Acura 3.0 CL (4 sale)
Posts: 17
Country:
Chats: 0
Thanks: 0
Thanked 3 Times in 3 Posts
Default

Hi all,
I am a new SLK owner. Had similar symptoms of others here. Engine cutting off in on hwy, and stopped at lights. Recently car wouldnt start at all, no crank, just radiator fan running on high speed. Pulled out K-40 and the solders dont look as bad as the ones pictured but I guess i can see some worn out frayed areas. My friend is going to resolder tomorrow. I hope this solves the issue but I'm not sure if this is the cause since the solders really dont look that bad. 1 question I have is: in bazzle's instructions it says "Remove old solder and resolder with new"....How does one remove the old solder?
Also, just wondering did anybody who posted that they were having these issues "Prabo, WeB, etc." ever come to a fix?
Any info grealy appreciated, ty.
View SLicK's Photo Album SLicK is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Lower Navigation
Go Back   Mercedes Benz SLK World Forum > Mercedes Benz R170 SLK Class Cars > SLK R170 General Discussion

Bookmarks

Quick Reply
Message:
Options
Upload your images to ImageShack

Register Now

In order to be able to post messages on the Mercedes Benz SLK World Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




LinkBacks (?)
LinkBack to this Thread: http://www.slkworld.com/slk-r170-general-discussion/1030-k40-relay-module.html
Posted By For Type Date
2000 SLK Ignition Troubles & Died at Light - Mercedes Forum - Mercedes Benz Enthusiast Forums This thread Refback 01-25-2009 02:54 PM
2000 SLK Ignition Troubles & Died at Light This thread Refback 11-27-2008 12:55 PM
That Nasty no start problem. - CrossfireForum.org This thread Refback 05-17-2008 06:35 PM
That Nasty no start problem. - CrossfireForum.org This thread Refback 05-17-2008 05:20 PM
That Nasty no start problem. - CrossfireForum.org This thread Refback 05-17-2008 01:57 PM

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

Posting Rules
You may post new threads
You may 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Anyone want a piecha module? bmetz SLK R171 General Discussion 6 07-09-2007 12:54 AM
Flasher Relay in R171 zxxn Ask DansSLK 4 05-28-2007 04:26 PM
K40 Laser Diffuser Pics tungster General Modifications R170 2 11-11-2006 10:57 PM


All times are GMT -4. The time now is 03:18 AM.


 
 
 

Powered by vBulletin Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO
Clubs, Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
SLKWorld 2006-2010
Design by Fife Web Solutions


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276