Honda 37870-PK2-015 Sensor Assembly, Water Temperature (Hadsys)

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First of all, remove the engine cover, drain the coolant, disengage the ECT sensor, unscrew it, replace its O-ring, and finally reverse the process to install. Then do the same for 2003-2006 Acura and Honda Models from 2005. For 2007 Acura models with two ECT sensors, lift the vehicle, remove the splash shield, drain coolant, disconnect the sensor, replace the O-ring, and reverse that procedure for installation.

The Engine Coolant Temperature (ECT) sensor works as a thermistor whose resistance varies with coolant temperature. Hence ECT determines how much fuel is going to be mixed with air into the engine. The engine will lose its power and stop if it is unplugged. So you should measure the ECT sensor resistance while the engine is cold and hot to perform this test. In other words, it should read 5000 ohms once it is cold then 100-400 ohms in its hot state. This could mean that the sensor may not be working properly. Disconnecting the battery, draining the coolant, removing the old sensor, and installing a new one with Teflon sealant will facilitate replacement. Top off the coolant, start the engine, and check for leaks afterwards.

The fundamental discharge duration is interpreted from the signals transmitted from this sensor via the ECU.

The first step is to remove the key from the ignition lock cylinder and then drain the engine coolant.

The coolant temperature information is conveyed to the instrument panel through the PCM from the Engine Coolant Temperature (ECT) gauge sending unit.