4/1/2019
OK, I had the same problem for quite a while on my 2004 coupe. Last weekend I unplugged the lead to the air pump (front if the engine, right on top. You should see TWO pins marked + and - in tiny little symbols). I briefly attached jumper wires from the battery to the smog pump. It ran fine, so now I know that is good.

Tonight I first removed the negative (black) cable from the battery, then unplugged the ECU (passenger side near the back of the motor, move plastic sliding locks, 5 or 6 multi pin plugs, one 40A fuse - see photos some posted here on this page) from the car, then CAREFULLY pried the plastic back cover off (use 2 or 3 flat screwdrivers and be sure they don't damage anything inside). Then I am looking at the 5 (or so) mounted relays. The one furthest toward the back of the car is for the smog pump (4 pin plug). CAREFULLY remove the tiny little spring from the relay and DON"T drop it or LOSE IT or you're toast. Move the little copper cable (that holds the square contact plate on) up and over the corner so that you can pull the little contact plate back out of its little slots and pull it out away from the relay with the copper cable still intact. This will allow you to take a look at the tiny little contact plate electrodes. Mine were all black and burnt, but otherwise is fairly good shape. Take a SMALL nail file with fine sand paper on it (maybe 200 grit or higher) and CAREFULLY and lightly sand and smooth and clean both the slot (inner electrode) and the other electrode on the little plate. Don't remove any electrode, just clean them up and give them a smooth surface - doesn't take much sanding. GENTLY reassembly the relay putting the little spring back on and be sure it holds the relay in the OPEN position (just like the others). Reassemble and reinstall the ECU unit in the car. Put your battery cable back on (this will have reset your Check Engine light). Start the (awesome) Crossfire up and be blown away at how awesome runs now. Note... no more engine light. Repair cost: $0.00 plus 20 minutes of light labor. This worked great for me. If it helps you, just send me lots of your money (hey, the mechanic would have got it anyway, right?).

If you still get the 0410 code after doing this you'll probably need a new ECM, ( OR I'll give you $75 for the whole car... if it doesn't have any rust... if you can deliver to my house in Ohio :-} ).

I sincerely hope this helps lots of people avoid an expensive repair for this simple issue. Bad on you MB, but really once you've been in there once, its a really easy fix.

 

Pull the ECM and inspect the relay. It may be frozen closed causing the the pump to run too much.

 

I believe you meant RCM, not ECM.

 

What is the leading cause of the secondary injection pump not to come on

 

burnt relay in the RCM

 

Hello Crossfire owners and experts,

I have a problem with my crossfire (2005 convertible) where I see the engine warning light burning, it gives a secondairy airpump warning code which does't go away.
It all started with a starting issue of the engine, where I replaced the RCM for a new one.
Starting was solved, however now the engine warning light doesn't turn off anymore and gives the secundairy airpump code 035.
I informed at a Mercedes garage and they indicated that the valve on the pump sometimes is not good anymore, they (Bosch garage) measured the secundairy pump which runs properly.
So they replaced it with a new valve, however issue still there.
I have the feeling it has to do with the replacement of the RCM, is there a specific guideline to do this or a trick which prevents the light from going on?

Can someone help me out with some good information or has someone got experience with this issue?

Remco

 

Send the RCM to tighed1, he will replace the relays.
Contact him via email at tighed1@hotmail.com.

 

I have already replaced the RCM module with new relays.....

 

OK, pull it out and leave all 5 connectors on, remove the cover.
Look and see if the air pump relay is energized.

 

I'm having the same problem bought the 04 and replaced the rcm for the no run witch was the relay in the RCM for the fuel pump also it has the relay for the air pump that turns the air pump on I checked the relay contact and made it manually the pump comes on but no automatic I'm needing to no what valve or solenoidor or sensor makes this bastard work. Sorry this car has been a work in progress an all the same problems seems to be the same throughout the whole Fleet also with the radios rather the amp or the head .please when someone reads this and has fixed there car air pump an not be replacing the air pump it's self let me no

 

I did replace the rcm also witches fixed the fuel pump problem the air pump is not comeing on when the car is cold but I can make the relay manually with the cover off what make the relay come on are there a air solenoid sensor or anything up near the pump that engages the relay to turn on ? I belive the suction on 1 of the vacuumlines on 1 of the air valves. Has something to do with this please help if you no .

 

Hi All, I hope I`m posting this correctly, I`m looking for a bit of help, lol, as usual, I need to replace my secondary air pump, I`m in the UK it`s a 2005 Roadster and the Chrysler part is so expensive and I`m trying to get the equivalent MB part number, I have a part number A0001403785 I got from Ebay but I` don`t know if it is the correct one, any help or advice would be great

Regards

Teak

 

That part number appears to be correct, on Amazon it lists the SLK320 as compatible, and that is the twin sister of the Crossfire.

 

Brilliant ala xfire, thanks, I just have to locate one now at a half decent price, thanks

Regards

Teak

 

What is wrong with the pump? Some can be repaired, some have faulty valves, blocked air inlets, poor contacts on the RCM.
Any codes set?
These pumps get expensive and some areas can have them not working at all, it depends on the pollution laws in your area.

 

Hi onehundredand80, the bearings have seized up , I got the 410 code, that new pump I put on it was brand new and only lasted less than a year, I only did probably 3,000 miles in that time

 

If the RCM has seized contacts the pump runs all the time and that would cause bearing failure.
the bearings could be replaced and any brushes replaced.

 

That's good information on the RCM potentially faulty, the bearings failed and caused the armature and commutator to come into contact and it's irreparable I think, thanks for your help on the RCM though, that's useful

 

Is there any reason to not just temporarily pull the 40A fuse controlling the secondary air injection pump?

My plan is to replace the relay, but meanwhile I am tired of hearing the pump cycling on and off. Pulling the fuse would stop such cycling and possibly prolong the life of this poorly engineered pump and subsystem.

 

I went through a lot trying to correct the relay issue and finally just replaced the entire rcm box to avoid other future relay failures:



Replacement RCM $125 or less. Google search: "Crossfire RCM".