ECT Sensor question

Just turned the key for the first time on my b16a and got a code 6 (ECT Sensor). I read somewhere that coolant level may cuase this code and since this is the first time i tried to turn the engine over could the coolant not have reached the sensor? I cranked the engine like 4 times, read the code, made sure the plug was all the way in, scratched my ass, then cranked it another 4 times....no go.

Make sure that the wires are in the correct places both at the ECU and the sensor.