Coolant temperature switch12/4/2023 ![]() Walker Products will not be held responsible for any use of this information. The codes listed for this product type are common instances that may relate to your vehicle and should be used as a guide only. OBD II is now the standard in diagnosing vehicle emissions, which was implemented by all automotive manufacturers in 1996. In an effort to reduce vehicle emissions, the Environmental Protection Agency (EPA), mandated that all vehicles manufactured after 1996 would be equipped with OBD II (On Board Diagnostics 2) technology. The following OBD II error codes are the most commonly found with this product type. Poor idle (necessary to pump the gas pedal to keep vehicle running).Black smoke coming from vehicle’s exhaust.Symptoms of a failing Engine Coolant Temperature Sensor may include: It may turn the cooling fan off or on, open the exhaust gas recirculation or communicate the need for a richer fuel mixture.Ĭommon causes of Engine Coolant Temperature Sensor failure include: The vehicle’s computer will use this information to adjust certain engine functions to keep engine temperature at an ideal level. This gives an indication of how much heat the engine is giving off. Start your car and allow it to run for a few minutes to ensure that the coolant temperature readings are authentic and that the engine is running efficiently.The Engine Coolant Temperature Sensor (CTS or ECT) uses electrical resistance to measure the temperature of the coolant/antifreeze mixture in the cooling system.Once you have verified that the wiring is accurate, reconnect the negative battery cable.The resistance values should correspond to the temperature of the engine coolant. Use a multimeter to test the sensor’s resistance and ensure that the wiring is accurate.Refer to the wiring picture for your specific sensor type to determine the correct wire links. Depending on the type of sensor, you may need to ground the sensor wire or connect it to a 1-wire and a reference voltage wire.The sensor is typically located on the engine block and is in contact with the engine coolant. Disconnect the black battery cable to prevent any electrical shocks or damage to the system.You can consult your car owner’s manual or a repair handbook to determine the type of sensor and its wiring diagram. Identify the type of coolant temperature sensor in your car.Related Post: Can A Bad Coolant Temp Sensor Cause Rough Idle, No-Start, Or Misfire Similarly, when the engine coolant temperature decreases, the sensor resistance also decreases, which sends low earth signal to the temperature gauge, and the indicator rests on the cool indication. 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 ![]()
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