unknown plug??

[Turnman261]

what is the little plug right next to the engine coolant temp sensor? mine is all corroded.

1990 ka24e

[Newcastle82]

Technically it's another engine coolant temp sensor. The one with the brass connector on the end of it, the one on the left, has a single male connector. That sends to the gauge cluster. The black connector located just right of that brass one sends to the ECU to help with fuel/air mixture (not 100% positive of this, but I know it works with the ECU). They get corroded easily. Replace them both. 40 bcuks at a good parts store with an ESCA discount. =)