Diagnostic codes # P0115 to P0119 all relate to the ECT (Engine Coolant Temp) sensor circuit.
Assuming you have correctly diagnosed a faulty ECT sensor, here are the instructions to locate and test:
* Look for a bolt size sensor with a wire attached - on Mitsubishis, the ECT sensor is usually located either on the Intake Manifold, or close to the Thermostat housing (to measuer coolant temp).
This is what is looks like:
* To test the ECT sensor:
* With the sensor portion immersed in hot water, check resistance as per the table below (convert to degrees F if necessary):
* If the resistance is too far out of spec, then replace the sensor.
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