Brown plug? That's the Cols Start Injector time switch. It's a temp sensor which determines if the CSI is used and limits the duration that it's used while the engine is being cranked. The CSI (Cold Start Injector) is ONLY engaged while the engine is being cranked AND the coolant is cold. It can fix sluggishness issues while starting the car in cold weather; Generally the car will start without it in such conditions, it will just take longer. The sensor is not used for any other purposes and does not affect the ECU's operations while the vehicle is running.
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