![]() When the temperature of the coolant increases, the resistance of the sensor decreases, which sends high earth 1-wire to the temperature gauge, and you see the temperature gauge indicator fully turned to the hot indication. Higher the temperature of the engine’s coolant, the lower the resistance of the ECT sensor, and vice versa. The coolant temp sensor provides an earth signal according to the temperature of the coolant. In three-wire coolant temp sensors, the ECU does not control the temperature gauge in the cluster. The two wires, a “5-volt reference”, and a “ground wire” go to the ECU, and the third wire “Earth 1-Wire for Temp Gauge” goes to the cluster-mounted temperature gauge by providing an earth link to the temperature gauge. Earth 1-Wire for Cluster-Mounted Temperature Gaugeģ-Wire-Coolant-Temperature-Sensor-Wiring-Diagram.A three-wire coolant temp sensor has the following three wires. The three-wire coolant temperature sensor is superseded by a two-wire coolant temp sensor. ![]() 3 Wire Coolant Temperature Sensor Wiring Diagram 3-Wire-Coolant-Temperature-Sensor-Wiring-Diagram If the coolant goes over its maximum temperature then the switch will close to earth indicating a fault.III. When the engine runs it should then not open unless the coolant temperature is high. When the engine is at rest and the engine has not been run to the point it has overheated, the coolant temperature switch should be open to earth. To check the coolant temperature switch you need a multi-meter reading resistance. How do you check a coolant temperature switch? ![]() Switches are often provided by the engine manufacture, rather than the generator manufacturer. Engine manufactures determine what the level of low oil pressure is and when the engine should be shut down to prevent problems or catastrophic failure. Traditionally a coolant temperature switch is closed to earth on fault (when coolant temperature is high) and open when the coolant temperature is below this maximum requirement. Normally screwed into the engine block, it has two states, either open or closed. The coolant temperature can be monitored by either a coolant temperature switch, or a coolant temperature sender.Ī coolant temperature switch is an on engine protection device that is used to monitor the coolant temperature pressure of the engine. In generator protections, a high coolant temperature alarm is used to alert the operator to the engine suffering from high coolant temperature. What is a coolant temperature switch? How is it used to monitor coolant temperature? Why is it useful? How can I check the coolant temperature switch?
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