Good day folks. Have searched the archives for this P0410 with no definitive cure.

Question ?
What is the logic chain to operate the AIR relay to allow air flow to exhaust when cold?

I have performed the following...

Launch X413 Master Scanner in Mercedes: 'Actuations': 'Perform check'. 'Aborted'.

This function 'Aborted' on every actuation request. .

Replace all soggy vac' hoses. Check operation of AIR diverter valve: Okay and clear.
Vac' tested AIR control valve : Opens and closes and flows okay. Air pressure from compressor okay at control valve.

Air flows into exhaust if vac' applied to valve....then O2 drops to single mV numbers.

Check AIR flow to system. Okay. ( Can blow into AIR check valve to flow air to engine with little restriction...through metal pipe to engine block.)

Check operation three-way relay and vac' to it from intake: Okay, 17 inches at relay....Blue check valve working.

Check electrical operation of 3 way relay whilst engine on cold start : No vac' passes from relay to control valve, only boost pressure when opening throttle. Test light shows power to relay and most of the time to ground side but no vac' passes to control valve.

Watched O2 warmed up on throttle closed from brief WOT ....-3mV for 3 seconds.

Code P0410 is not setting after three cold starts. This is only code to set after customer drives a week or so.

Maybe head AIR passages restricted but not measuring any air flow control as control valve never gets a vac' signal.

I'm going to Startek soon, although folk tell me that's not a great help either.

Thanks in advance for any pointers you know.

regards

dk



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