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Secondary air injection pump failure?

Tiny
JITHIN MATHEW
  • MEMBER
  • 2011 MERCEDES BENZ C300
  • 3.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 92,000 MILES
My secondary air injection pump failed 2 weeks ago, and I replaced it with a brand-new OEM one from FCP Euro. The pump will not turn on after a cold start as it should, and the Check Engine Light will just come back on. I assumed the relay was shot so I replaced that with OEM one from Mercedes, but it still doesn't work. Any other suggestions?
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Tuesday, November 15th, 2022 AT 10:19 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,340 POSTS
Hi,

What diagnostic trouble code are you getting when the light turns on? Let me know so I can take a look at possible causes.

If you haven't, I would recommend scanning the can-bus for codes. This way, we can determine if there are codes stored in any of the modules.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Let me know.

Take care,

Joe
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Tuesday, November 15th, 2022 AT 9:27 PM
Tiny
JITHIN MATHEW
  • MEMBER
  • 62 POSTS
I am getting the code P0410. Secondary Air injection pump. My old pump sounded like a jet engine for about 10,000 miles and it eventually stopped working last week and CEL light came up. I replaced the pump with brand new OEM one last weekend, but the pump is still not engaging after cold start and the light keeps coming back on. I replaced the relay that I circled on the attached picture.
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Tuesday, November 15th, 2022 AT 10:33 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,340 POSTS
Hi,

As far as it no actuating, have you checked for power at the pump itself? Take a look at the pic below and let me know what you find.

Joe

See pic below.
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Wednesday, November 16th, 2022 AT 7:33 PM
Tiny
JITHIN MATHEW
  • MEMBER
  • 62 POSTS
I will take a look at that. Can you tell me where exactly is the fuse for it? I changed the relay already.
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Thursday, November 17th, 2022 AT 2:44 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,340 POSTS
Hi,

No problem. Pic 1 shows the relay and the power distribution from the fuse to the relay. There are two that may have failed. However, if the old pump was failing, my first suspect would be fuse 32 in the under-hood fuse box. See pic 3 for fuse location. Pic 2 is the pre-fuse fuse box which has a much higher amperage fuse. I don't feel this would have failed, but anything is possible.

When you check fuses, make sure they are good first. If they are, it is important to make sure there is power both to and from them.

Here is a link that you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know what you find.

Take care,

Joe

See pics below.
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Thursday, November 17th, 2022 AT 4:18 PM
Tiny
JITHIN MATHEW
  • MEMBER
  • 62 POSTS
Thanks for the information. If you look at my picture, fuse 32 is the 40 amp fuse. Is that the right one? I pulled this fuse and looked at from the top it seems like it’s intact. Is there supposed to be like an LED light on top of it that will turn on indicating that the fuse is blown.
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Thursday, November 17th, 2022 AT 8:28 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,340 POSTS
Hi,

I'm not sure about the light. However, if there is no power to it, it won't light. Were you able to check the circuit for power? If there is no power, then the other fuse I mentioned may have failed.

Let me know.

Joe
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Thursday, November 17th, 2022 AT 8:50 PM

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