What is the reason for the P2185 fault code?
1 Answers
P2185 fault code generally refers to the coolant temperature sensor circuit being too high or poor internal contact of the sensor. The usual solution is to check whether the coolant temperature sensor is damaged or if there is poor contact. Below is extended information: 1. Introduction: The P2185 fault code, applicable to all car manufacturers, means Engine Coolant Temperature (ECT) Sensor 2 Circuit High. The Engine Coolant Temperature (ECT) sensor transmits the temperature of the engine coolant to the Electronic Control Unit (ECU) in the form of an electrical signal based on the principle of a thermistor, serving as a basis for adjusting fuel injection and ignition. 2. Principle: The coolant temperature sensor is installed in the engine block water jacket or coolant pipeline, in contact with the coolant, to detect the engine's coolant temperature. After receiving this temperature signal, the ECU adjusts the fuel injection time and ignition timing. The slender head of the engine coolant temperature sensor contacts the coolant, and its interior contains a negative temperature coefficient thermistor. When the engine coolant temperature gradually increases, the resistance of the thermistor gradually decreases, and vice versa. When the engine coolant temperature changes, the sensor's output voltage also changes accordingly. After receiving the signal from the coolant temperature sensor, the ECU adjusts the engine's fuel injection time and ignition timing. To determine whether the coolant temperature sensor is functioning properly, it is necessary to measure the sensor's resistance value, signal voltage value, and power supply voltage value.
