R-Class (W251) Produced 2006-2013: R320CDI, R350, R420CDI, R500

P0410 relay not closing

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Old 08-29-2022, 08:16 PM
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R350 2009
P0410 relay not closing

Been trouble shooting P0410 and it’s down to the relay contacts not getting a signal to close. Initially swapped it with other (matching) relays from the box thinking I had a bad relay. I also pulled the relay and put a jumper on the sockets to run the pump manually, as a sanity check for the power circuit to the air pump.

As far as I can tell, the relay just isn’t getting a signal to close. Even pulled the relay cover off to measure directly and it just looks like the coil isn’t getting any power.

Is there another non-obvious fuse in this circuit? Or something else to look at?

Thanks!

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