Volvo All Engines (2017 Emissions) Fault Code: P050C00 PID: EMS Cold Start Engine Coolant Temperature Performance
Volvo All Engines (2017 Emissions) Fault Code: P050C00 PID: EMS Cold Start Engine Coolant Temperature Performance
The Engine Coolant Temperature Sensor is a thermistor. The resistance of the Engine Coolant Temperature Sensor changes inversely to the temperature of the engine coolant. When the coolant is cold, the sensor resistance is high. As the temperature of the coolant increases, the sensor resistance decreases.
The Engine Control Module (ECM) monitors the voltage drop across the Engine Coolant Temperature Sensor.
The coolant temperature signal is used to calculate fuel injection and to evaluate operating conditions of the engine coolant temperature. Examples of conditions that may cause high coolant temperature are: thermostat failure, fan failure, heavy load, high ambient temperatures and radiator blockage.
The sensor’s signal is monitored by the Engine Control Module (ECM).
The engine control module (ECM) will set a diagnostic trouble code (DTC) and derate the engine to avoid engine damage if the sensor signal is not within predetermined limits, or the signal is not rational.
Conditions for diagnostic trouble code (DTC):
1) Engine running
2) Ambient air pressure between -40 °F and 131 °F
3) Ambient air pressure between 10 psi and 15 psi
4) The engine coolant temperature (ECT) is above 131 °F
Probable cause
1) Connector
2) Wiring harness
3) Engine coolant temperature sensor
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