P1115 ACURA Engine Coolant Temperature Sensor Circuit Intermittent High Voltage

Possible causes

– Faulty Engine Coolant Temperature (ECT) sensor
– Low engine coolant level
– Engine Coolant Temperature (ECT) sensor harness is open or shorted
– Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
– Faulty engine coolant thermostat

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1115 ACURA OBD Code Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.