P1114 Mercedes-Benz Engine Coolant Temperature Sensor Circuit Intermittent Low 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
– 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)
P1114 Mercedes-Benz 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.
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