My secondary air pump on my 1995 white c220 comes on when the engine is hot sometimes it is only supposed to come on when the engine is cold. This is causing the computer to throw a p0411 code, my question is what causes the air pump to come on electrically, does it get its engine temp information from the coolant temperature sensor.. Any help would be appriciated.

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1995 c220 (harness issues sold)
1999 clk 320 cabriolet