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Old 02-27-2012   #1 (permalink)
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Default Secondary air pump problem??

Hi all..
I took my car to an indi garage on friday for a diagnostic on the cel which had come on a couple of days before.The diagnostic said it was the secondary air pump....but after clearing the fault and testing again it said there was no faults. The light came back on this morning on the way to work. Could it just be a relay causing the problem? The car still drives fine with no change in performance. Does anyone know where to find the relay for the pump to give it a check?
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Old 02-28-2012   #2 (permalink)
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Could someone post up the part number for this pump?
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Old 02-28-2012   #3 (permalink)
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Trixter,

I had a similar problem with the sec.pump.
In my case there was a wire damaged which caused a short-circuit.
Btw the sec pump only runs for a few seconds when the engine is cold.
Therefor the light didnt pop up in the shop after the restart; engine still warm...

Remove front engine cover and see if the 1" rubber tube is connected/leaking.
Remove the second cover and check the wiring-loom at the valvecover bolts.
Unplug all the connectors you can find at the front of the engine and clean
Now open the engine fusebox and check the 5(?)Amp fuse.

Hope this helps....
Happy hunting!

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Old 02-28-2012   #4 (permalink)
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Thanks for the info Ben, I won't get a chance to check it till the weekend, I hope its a simple fix.
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Old 02-28-2012   #5 (permalink)
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010 0001405185 AIR PUMP 001


http://www.neoriginal.ru/cat/mb/part...05_171_456_963

(lets see how long it takes the moddrtr to delete this post)


Ben.
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Old 03-03-2012   #6 (permalink)
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Hi all,

i have the same - CEL and error code P0410.

I replaced the MAF today as ... well as guessing and have had issues with these on past Mercs.

My car is a 2005 done 32k it feels all ok to drive, where is the actual secondary air part located?

any help would be great
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Old 03-03-2012   #7 (permalink)
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99% sure the secondary air pump is only used on cold starts to get the cat's up to temperature -
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Old 03-03-2012   #8 (permalink)
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ah ok,

do you know where it is located?
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Old 03-03-2012   #9 (permalink)
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If you remove the front part of the engine cover, the pump is right in front of you, top front of the engine. I did a check on mine today and couldnt see anything visibly wrong at the pump ( bad connections, burst hoses etc ) and i didnt have any dead fuses. I ran a diagnostic again and cleared the CEL, we'll see how long it stays out this time.
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Old 03-03-2012   #10 (permalink)
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Thanks - will check my hoses tomorrow.

I checked my fuses all seemed ok too, do you know which is the relay as might swap that too.
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Old 03-03-2012   #11 (permalink)
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The Air Pump relay is N10/1kO -- Relay "O" in the Left-side SAM.
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Old 03-04-2012   #12 (permalink)
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I've got the same problem after putting the damn "Premium" arco gas in my SLK (It seems like there is no connection between 2 things but that's the only thing I can thing of, my car was working fine before that). I had to changed the secondary air pump and relay at mercedes dealer (I bought the parts online and have them changed for me). It's about $120 for labor and 450 for the air pump, i don't remember the price of the relay.
GOOD LUCK.

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Item Number Description Price 000 140 51 85 Air Pump $411.20 Sub-Total: $411.20 Shipping Cost $14.85 Total: $426.05
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Old 03-04-2012   #13 (permalink)
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am thinking new airpump..

Just out of interest.... what is relay M for? as its the same part no as O and thought i could swap as part of the elimination process?
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Old 03-10-2012   #14 (permalink)
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HI all,

ok ive been looking under the bonnet and can hear what sounds like air escaping - ive checked the hoses i can see...

as you look into the engine bay the noise appears to be coming from the right hand side of the car, but i cant see anything split or loose - sounds like it maybe below the actual engine..

are there air intake pipes on this side of the car|? or is it the aircon on that side?
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Old 03-10-2012   #15 (permalink)
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here is a pic of where i mean.
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File Type: jpg IMG_0301.jpg (47.5 KB, 95 views)
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Old 03-10-2012   #16 (permalink)
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Relay M is "Circuit 15R Relay", which powers lots of interior components, including the restraint system.
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Old 03-11-2012   #17 (permalink)
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I had my car at the garage yesterday, but he had gremlins in his diagnostic equipment so it will be back in next week sometime.Ill keep you posted with the outcome.
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Old 03-16-2012   #18 (permalink)
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did you get any further with your garage?

im pretty sure mine is a air pipe leak as i can hear what sounds like air getting out.......

I cant see anything from looking into the engine bay so may need to go under the car

dont suppose anyone has a image of the air intake pipe diagram do they...
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Old 03-17-2012   #19 (permalink)
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Quote:
Originally Posted by leemanuel View Post
did you get any further with your garage?
Im waiting till he gets his MUX back from being repaired...so should get it in next week
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Old 05-13-2012   #20 (permalink)
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I'm writing this post about my experience to hopefully save everyone an expensive and unnecessary repair to their SLK 350 and probably other MB models. The secondary air pump has nothing to do with how the car performs and it made me mad that I had to spend a chunk of change on this just so I could get my inspection sticker.

The check engine light came on on my 2006 SLK 350 around 43K miles. I went to Autozone to pull the codes and found the P0410 Secondary air pump codewas the culprit. I went to the dealer and they wanted $200 just to look at it (Park Place Mercedes) after I told them I already knew what the problem was.

I started searching and found similar issues. I wanted to find out what caused it. I bypassed the fuse and found the air pump was pulling almost 100amps, wow!! I pulled the pump, opened it up and found it was fried. There was black dust all over the cover and I even found pieces of copper windings. The cause IMO, burnt contacts on the relay "O". While I was diagnosing the problem, I popped the cap off the relay and I could see the contacts were burnt.I checked with Park Place Mercedes parts department and they wanted $850 for a new pump and $38 for the relay . Went online and got the pump for half of that and the relay for $6.

I installed the new pump and when I tested it I was surprised to find the pump was pulling +-40amps while it was injecting air (first 30sec from a cold start) and about 22amps when I ran it while the valves were closed and it wasn't able to push air (direct connect from the battery, the pump blades stall and uses less power). I immediately thought there was something wrong and that the Amperage was way to high and it would burn up the pump motor again (I couldn't find any specs on the motor of how much current it should draw). I was worried there may be another bad connection, so I made a harness directly from the battery and found the pump actually pulls about +-40amps at 14.1V (that voltage is when the alternator is charging after a start). Personally I find this current draw way to much for the relay, harness, connectors and pump. To me it's just a matter of time before one of the components/connections fail again.

To save everyone $$$, my advise is to change the relay every year or two and check the contacts regularly. A $6 relay could save you about $500 in repairs if you do it yourself and about $1500 from a dealer.

While doing research on this I found other causes for P0410. If the relay and pump motor are fine, but the pump isn't pushing air, check the small blue check valve on the vacuum lines and that the exhaust valves are actually opening in the first 30sec after a cold start. Also check all connectors, the neg wire off the pump and the fuse and it's contacts. The way this system was designed, it's going to fail sooner or later. Check/replace the relay often and save some $.

Last edited by Spoke; 05-14-2012 at 08:27 PM.
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