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SL600 / SL450 (107) / E350 / BMW M5 E60 / BMW 745i (E23) / BMW X6M / Toyota Hilux 4 WD/ Honda CBX 10
Originally Posted by MYSL55AMG
Hi Juha. Could you please instruct me as to how to check if its the relay or pump.
Thanks
You have three ways to check it.
1.Go to Mercedes service dealer... they can test drive it with the Star diag.
2.Take of the pump plug behind the pump and draw two wires + and - from the start battery and connect them at the two pins behind the pump. If the pump is okay it's start to run and then you now it's maybe the relay.... BUT DON'T BURN anything.
3. Take of the relay and find the right pins under the relay and connect the pump from there.
YEA SL55 AIR PUMP LOCATE BEHIND RIGHT FRONT BUMPER: AND RELAY IS "BROWN" COLOR ON PASSENGER FUSE BOX..ALSO A FUSE 40AMP..MAKE SURE THAT NOT BURN
Apologies for bringing this thread back from the dead. I've got a 2005 SL55 with a P0410 code being thrown.
I cannot for the life of me find the air pump by looking around the engine bay near the right headlight! Do I need to take out the front fender to see it?
EDIT: After finding this post by Ekselent, I think I've found it. Linking it here, in case others are wondering the same thing
EDIT EDIT: Nope, I must be blind. I think I have to take off the front bumper in the SL55 to get to it? ¯\_(ツ)_/¯
Last edited by rizwan; Mar 7, 2016 at 12:44 AM.
Reason: Answered my own question (2nd edit: Nope)
I finally found it on my 2005 SL55. It's under the right-front headlight, and you can get to it by removing the right-front wheel lining. You'll pretty much have to remove the wheel to get around to removing the lining, as well as to remove the pump.
Since I had so much trouble finding the pump, I figure others might have a problem as well, so here are some photos:
You can see the pump (circular flat thing in the bumper), after you remove the wheel lining (several nuts, but not as hard as I thought it would be)
In my case, there is voltage in the power line to the pump, but the pump does nothing. Time to replace the pump.
Last edited by rizwan; Apr 4, 2016 at 02:57 AM.
Reason: Added pictures through a PC, since the uploader has a bug with iPads
You can also disable the smog pump entirely using Star hardware with developer mode. Car will startup and idle much smoother, and smog pump shows up as "pass" on OBD emissions check.
If you are replacing the pump replace the relay as well. It may read good voltage with no load. I disassembled the relay on mine and the contact were burnt but would flow at no load.
I finally found it on my 2005 SL55. It's under the right-front headlight, and you can get to it by removing the right-front wheel lining. You'll pretty much have to remove the wheel to get around to removing the lining, as well as to remove the pump.
Since I had so much trouble finding the pump, I figure others might have a problem as well, so here are some photos:
You can see the pump (circular flat thing in the bumper), after you remove the wheel lining (several nuts, but not as hard as I thought it would be)
In my case, there is voltage in the power line to the pump, but the pump does nothing. Time to replace the pump.
Is the part number a sl500 part number or is it special to the 55?
On the SL55 the secondary air pump is easy to check...
Remove right front wheel.
Remove front half of black plastic fender well.
The pump is the black round thing on the right in pic below.
Remove 3 10 mm nuts (the one on the front side is a little hard to get to).
Disconnect one rubber hose (no clamp).
Lift pump and wiggle out (my hose disconnected itself while I lifted and wiggled).
Disconnect 2 wire connector.
Apply 12 V + and - to the two pins.
If she spins, the pump is fine.
My pump, relay and fuse are fine. No continuity between base of relay 87 pin and pump and when I apply 12V to base of 87 pin pump doesn't go. Is there something between? Wiring diagram would be helpful.
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