I'm not entirely sure if the 3 has a TPS wire. The drive-by-wire system uses the wires coming up to the throttle body to drive the throttle instead of a throttle cable. I'm not 100% on that but I'm sure someone else here can either confirm / disprove that.
you want the brown wire on the throttle body connector
when the throttle is closed you should see between .5 and 1.0
and at wot you should see 4.2 volts to 4.8 volts
hope this helps
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