355 broken wiring plug (engine bay)

Hello I have just finish doing a major engine out service and found a broken 3 wire plug. Yellow, black and dark blue wires. It was disconnected??. The plug is just behind the L/H cylinder head(Australia). The loom comes from in the engine valley and then down into the loom on the passenger side of the car. I am going to replace but not sure to what it actually controls any help would be great. There are no issues or lights on????