Arrangement for mounting an electronic control unit on an engine

An electronic control unit for an internal combustion engine having an induction system and an air inlet device defining a plurality of air intake passages through which air is supplied to the induction system and comprising at least one fin fixed in parallel with the flow of air through the air intake passages and at least one partition wall which cooperates in defining the air intake passages and which cooperates in dividing adjacent air intake passages on either side of the partition wall, said electronic control unit comprising an outer casing mounted in proximity to the air intake passage and a plurality of electronic parts mounted in said outer casing.