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Discussion Starter #1
So I got a 0410 code - secondary air pump issue. And in trying to start simplest (fuse) to most expensive (entire air pump), I discovered I could not find a working writeup on the fuse or relay for the secondary air pump on an slk320.

So, after scouring this forum and others I have discovered several things:

1. There are differences between the SLK320 and 230 fuse boxes (for understandable reasons)
2. There is more data on fuses for the 230 than 320 (again, understandable due to population)
3. A lot of the helpful pics and diagrams are no longer visible due to Dropbox being ridiculous.

As such, would appreciate help in mapping my fuses. The first one is easy...it is the traditional box on the drivers side (US) in the engine bay and still has the card. Pic below.



The second one in the drivers side dashboard is also easy but definitely doesn't have the secondary air pump fuse.

I did open the wiring box on the passenger side, but no card and would like to verify the circled items(hoping they are the secondary air pump fuse and relay!). Pic below.



Any help appreciated. Thx!
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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Discussion Starter #4
Isn't the air pump the 40A fuse in the problematic relay box ? Think is the one you circled.
Awesome...that pic is the first confirmation I have seen for those fuses, thx! Do you know where the associated relay is?

EDIT: Disregard my question...I see the relay is also on that pic. Thx very much!
 

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Drop the whole relay board out as per Padgetts picture (just unplug wiring and it lifts out) and re-new the soldering on the board as mentioned above, also clean relay contacts.
Hopefully all will be good when you put back together.
 

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Discussion Starter #7
Thx, All. The solder joints looked to be generally OK but a couple looked a little cracked, so I re-soldered all the major ones and the resistor ones...and it is definitely working now. I can hear the secondary air pump clearly when the engine starts. (wondering if it has been out a while). I love this forum.
 

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Hello Gents,
So I too have these issues but mines a bit different. add 12 volts to Pumps makes a healthy pump sound. Fuse is fine and it I tap the contact on the relay the pump works fine. But why is my pump not running while the car is running and I get the dreaded p0410 alone with the p0100. Mas air flow sensor. I cleaned the MAS airflow twice. Solder joints look fine by the way. What am I missing?

Thanks,
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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98,336 Posts
Hello Gents,
So I too have these issues but mines a bit different. add 12 volts to Pumps makes a healthy pump sound. Fuse is fine and it I tap the contact on the relay the pump works fine. But why is my pump not running while the car is running and I get the dreaded p0410 alone with the p0100. Mas air flow sensor. I cleaned the MAS airflow twice. Solder joints look fine by the way. What am I missing?

Thanks,
this thread is at least 2 years old
always better to start a new thread

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