oOh_Its_Grinch

Hello,
I am trying to troubleshoot an '06 W203 V6 P0410 problem. Does anyone have the vacuum hose diagram?
I am getting codes: 0810 & 0814 from a carsoft MBII scanner. --Secondary air injection on left and right bank of cylinders.

thanks

oOh_Its_Grinch

So I replaced the change-over valve, and used a vacuum pressure tester to test the two valves on the sides of the motors.. everything as far as vacuum has been tested successfully. --holds vacuum well and i validated that the valves work.
In fact, the old change-over valve tested good too when i applied +12VDC to it.

I also replaced the secondary air-pump relay just for the hell of it. --Old and new tested good.

Cleaned everything with carburetor cleaner.

I tested the actual secondary air pump by feeding it +12VDC volts, and it definitely works.. Blows alot of air, more than I thought it was capable of!

What else can I test? Everything seems to be in order, but the dang secondary air pump is not turning on during cold starts.
Yes, relay was checked, 40A fuse is good.

Any suggestions are greatly appreciated.

oOh_Its_Grinch

Followup question:

Testing/troubleshooting this is fustrating, because the circuit is only activated during cold start.
My question is: is there a way to fool the engine to energizing the relay for the air pump (without STAR)?
I'd like to test for voltage at the pump. Or better yet, is there a way to fool the computer to thinking the temperature is lower than it actually is? --Where is the engine temp sensor located?
Would testing at the relay socket at the front SAM be better? I did replace the relay and the relay tested good outside the SAM.

Russell Ormerod

Are you able to actuate the pump with your diagnostic tool ?
The the way the ecu detects a air injection fault is by checking O2 sensor values. So all you need to do is supply power to your air pump and actuate the switch over valves and with your scantool have a look if your o2 sensor voltages go to a lean condition. If there is no or little change then the ports in the head could be restricted with carbon

Russell Ormerod

Also if you think the pump is not being activated after a cold start. Then check the output wire from the ecu. You could unplug the ecu and gnd signal that wire. Then the relay should activate and the pump run. Then you know the circuit is good from ecu via Sam to pump.

ecmexchange

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oOh_Its_Grinch

Catching up to this a year later and the vehicle still has this problem. I scoured the internet and this forum for W203 ECU pinout for my C230 V6, but nothing came up.

In other pinout diagrams I've seen, would this be called the 'Air pump relay control'? --I am seeing this pin commonly as D-38 (4th cluster of pins from left to right, pin #38) and gray/gold color wire? Can anyone confirm?

Does anyone have a definitive pinout guide for the ECU on a 2006 W203 C230 V6? I suppose i could use my multimeter or toner to trace the wire but hoping to save some time as my emissions are due and don't want to fail on this.

huotalicusC200K

hi guys can anyone help with the vacuum plastic hose that connects near the firewall
im having so much trouble findind where it connects