Engine Coolant Temperature Sensor 1 Circuit

Engine coolant temperature sensor circuit malfunction. The ECT sensor (Hyundai) is located near the thermostat housing. Check the connector for coolant contamination from a leaking thermostat housing gasket. Test sensor resistance -- should be about 2.5K ohms at 68F and 300 ohms at 176F. Replace if out of spec. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

ECT sensor signal is erratic or out of range. Located near the thermostat housing on the cylinder head. Check the connector for corrosion. Test resistance: approximately 2.5K ohms at 68F. If the gauge reads full cold or full hot with a warm engine, the sensor has failed. Replace with an OE-quality Denso unit. Drain some coolant before removal to prevent air pockets. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

The ECT sensor on the Hemi is located on the front of the engine near the thermostat housing. Check for coolant leaks at the sensor O-ring that could contaminate the connector. If the scanner shows -40F with a warm engine, the circuit is open. Replace with an OE-quality Mopar unit. Bleed the cooling system after replacement to prevent air pockets. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.