Gauge is calibrated within the operating range of the sensor and As theĬoolant temperature changes, so does the resistance of the sensor. Increases, the electrical resistance of the sensor decreases. The sensorsĪre a Negative Temperature Coefficient (NTC) type. The sending unit isĪ heat sensitive variable resistor that is located on or near to theĬylinder head and threads into an engine coolant passage. Unit to transmit an electrical signal to the gauge. The engine coolant temperature gauge uses a heat sensitive sending Two terminals if it is an original factory VW part. The body of the sensor will be blue and the sensor will be The Engine Coolant Temperature sensor is mounted in the thermostat
Receive a signal from the ECT it will substitute a value of 176☏ It is also important to note that if at any time ECU does not Oxygen sensor circuit, exhaust gas recalculation, and fuel tank To control other such circuits as the idle speed, knock control system,
This device signals the engine management system with theĬurrent coolant temperature, the ECU takes this information and uses it Original VW part it will be black in color with a four terminalĬonnector. The Engine Coolant Temperature (ECT) sensor is mounted in the water The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown Beginning with model year 1994, the Engine Coolant Temperature Sensors combined the sensors for the ECM and the gauge into one sensor-1997 2.8L V6 sensor shownįig. The electrical connector of the 4-wire terminal sensor ( 1 and 2 ) is keyed to prevent improper connection of the sensor's electrical circuit.įig. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The gauge is calibrated within the operating range of the sensor and interprets the resistance value to display the coolant temperature.īeginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. As the coolant temperature changes, so does the resistance of the sensor. As the temperature increases, the electrical resistance of the sensor decreases. The sensors are a Negative Temperature Coefficient (NTC) type. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge.
Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.Ī1 and A2 platforms use a different type of circuit that A3 vehicles. The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. Connect the negative battery cable to the battery.įig.
#Coolant temperature sensor location manual install#
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