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Replacing secondary air pump relay switch. not marked on…

Customer Question
Replacing secondary air pump...

Replacing secondary air pump relay switch . not marked on fuse box . I need diagram for my 2011 c300 4 matic

Mechanic's Assistant: Okay, I'll connect you to the mechanic to discuss this further with you. Before I do, is there anything else you want him to know?

Yes air pump is blowing not making noise but hink that the relay is the problem error code says that

Submitted: 3 months ago.Category: Mercedes
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Customer reply replied 3 months ago
a diagram of all relays would be helpful
Customer reply replied 3 months ago
also I have new pump , but when I start car and take of house it does blow air and no noise, so I think its working even though I have error code for this problem ....Relay ???
Answered in 10 minutes by:
3/31/2018
Mercedes Mechanic: Dan, Technician replied 3 months ago
Dan
Dan, Technician
Category: Mercedes
Satisfied Customers: 25,969
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Mercedes Mechanic: Dan, Technician replied 3 months ago

Here is a diagram to help you locate relay. If that doesn't work I'd manually power on pump to make sure it works. My goal is to provide 5 star service so please let me know if you have any questions, thanks.

-

https://www.dropbox.com/s/q7gcurtbengj708/air.pdf?dl=0

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Customer reply replied 3 months ago
I start car cold take off in hose and its blowing air , so my guess its working. no noise runs quiet ? but I have the error code for pump and cant get inspection sticker here in Ma
Mercedes Mechanic: Dan, Technician replied 3 months ago

It should blow about as hard as a hair dryer so if it is blowing weak that could be problem Fact it is blowing at all means relay is working, what code are you getting?

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Customer reply replied 3 months ago
P0410
Mercedes Mechanic: Dan, Technician replied 3 months ago

This usually means weak air pump or the Air Injection Reaction Diverter (AIRD) Valve​ is not working. So I'd check to see if pump seems to be blowing as hard as a hair dryer if so then replace the reaction diverter valve, also make sure to check the vacuum line going to the valve. Let me know if you have questions, thanks.

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Customer reply replied 3 months ago
Replaced relay . Error code is PO410
Mercedes Mechanic: Dan, Technician replied 3 months ago

This usually means weak air pump or the Air Injection Reaction Diverter (AIRD) Valve​ is not working. So I'd check to see if pump seems to be blowing as hard as a hair dryer if so then replace the reaction diverter valve, also make sure to check the vacuum line going to the valve. Let me know if you have questions, thanks.

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Mercedes Mechanic: Dan, Technician replied 3 months ago

On cold start the AIRD should be getting enough vacuum to open. If no vacuum or weak vacuum then problem is likely a leaking hose or switchover valve which allows vacuum to go from engine to the diverter valve.

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Customer reply replied 3 months ago
Picture of my fuse box
Mercedes Mechanic: Dan, Technician replied 3 months ago

Here is the picture of your fuse box to locate relay.

-

https://www.dropbox.com/s/q7gcurtbengj708/air.pdf?dl=0

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Mercedes Mechanic: Dan, Technician replied 3 months ago

Ever get it figured out? Please do not forget to rate answer, thanks.

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