The effect of coolant temperature sensor and fault analysis

Coolant temperature sensor, its internal thermistor, as the cooling fluid temperature change, and ECU by THW terminal measured pressure value changes, ECU according to the partial pressure value to judge the coolant temperature. So, when using car coolant temperature sensor is used for what? When the car engine run into problems, how should be from the coolant temperature sensor on the analysis of the problems?

the role of the coolant temperature sensor:

1, responsible for controlling mixture vapor concentration, the lower the temperature, the mixed gas grows; The higher the temperature, the rarer mixed gas.

2, responsible for warm machine control motor speed, speed under 40 ℃ for 1500 rmin, 40 ~ 70 ℃ speed is 1100 rmin

3, responsible for controlling the radiator fan, above 85 ℃ began to low-speed rotation, 105 ℃ at high speed.

4, responsible for the control of automatic transmission, 56 ℃ above torque converter into locking condition, 70 ℃ transmission allowed into overdrive.

5, is responsible for the control air conditioning, 120 ℃ air conditioning out of control.

coolant temperature sensor fault analysis

the engine coolant temperature sensor circuit, data flows show that high temperature above 100 ℃, mixed steam too loose wouldn't start; Sensor circuit or wire the poor contact, data display - flows Below 30 ℃ low temperature, cause vapor mixture too thick, exhaust smoke.

obd - Ⅰ system setting engine control unit will be defined in - induction coolant temperature sensor temperature 35 ℃ ~ 120 ℃, exceeds or is lower than this range, the control unit can determine the sensor fails, there will be no fault code in the scope. If the coolant temperature sensor circuit, switch on the ignition switch data flow display coolant temperature over 100 ℃, but in the absence of up to 120 ℃, so leave no fault code.

obd - Ⅱ monitoring system of electrical appliances, mainly to provide the relevant information or common information of sensor information, in order to determine which sensor fault, it is short circuit or open circuit and other information. Information such as the coolant temperature sensor and the inlet temperature sensor information or start time after the comparison, it can be concluded that the coolant temperature sensor information is accurate, if there is a short circuit or open circuit fault sensor. So the coolant temperature sensor OBD - after a short circuit Ⅱ system leaves fault codes.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor