Nissan 22630-51E00 Engine Coolant Temperature Sensor

Remove/ install Coolant Temperature Sensor, but removing/ installing Coolant Temperature Sensor you have first to disconnect negative battery cable. Lose the cooling system until the coolant level goes down below the coolant sensor position. Loosen the electrical connector at the base of the sensor, and pull on it to remove the sensor from the engine. On some applications, the coolant sensor screws into the thermostat housing. Installation is the mirroring of the removal method, only in this instance it is carried out in the opposite order. This is to include procedures such as filling and bleeding of the cooling system. For the Oil Pressure Switch, loosen the negative battery terminal and the electrical connection from the oil pressure switch. Take off the oil pressure switch on the engine. Installation is done in the opposite manner of the removal process indicated above, the difference being that there is no need to wrap copper wires around a cable. Check the oil level.

The coolant temperature indicator system consists of a temperature gauge mounted in the instrument panel and a coolant temperature sending unit mounted in the water passage on the timing belt end of the lower intake manifold. There is more than one temperature sensor, but only one is used for the indicator system. If an overheating indication occurs even when the engine is cold, check the wiring between the dash and the sending unit for a short circuit to ground. If the gauge is inoperative, test the circuit by briefly grounding the wire to the sending unit while the ignition is On (engine not running for safety). If the gauge deflects full scale, replace the sending unit. If the gauge doesn't respond, check for an open circuit in the gauge wiring. To test the sending unit, disconnect the electrical connector and attach an ohmmeter from the pin on top of the sender to an engine ground. With the engine warm (167 degreesresistance should be 179 to 219 ohms. When the engine is hot (212 degrees F), the resistance should drop to 60 to 72 ohms. If the sender fails the test, replace it. If the sending unit must be replaced, unscrew it from the engine and quickly install the replacement. Use a conductive sealant on the threads (not Teflon tape). Make sure the engine is cool before removing the defective sending unit. There will be some coolant loss as the unit is removed, so be prepared to catch it. Check the coolant level after the replacement part has been installed.

If tests show that the sensor is working well and is not responsible for the observed driveability concern, scan the wiring harness and connectors between the sensor and the PCM for opens/shorts. In the case of a negative output, it is highly recommended to subject the vehicle for diagnosis by a competent repair facility. Before concluding that an ECT sensor is defective, make sure that there is adequate coolant in the system. Like the IAT sensor, the ECT sensor is also a thermistor that gets affected by the change in its temperature and is installed in the engine cooling system close to the thermostat housing to access coolant temperature. This way, the change of the coolant temperature causes a change in the resistance of the sensor and the PCM uses this information to determine engine operating temperature. A problem in the ECT sensor circuit causes a check engine light accompanied by a trouble code that originates from the wiring, connection, or the sensor. On models that include two very similar sensors placed side-by-side; one basically supplies the info that the sender in the instrument panel uses to display the coolant temperature, the other sensor supplies the same data to the Electronic Engine Control (ECT). The temperature sender has a tan or brown plastic body while ECT sensor connector usually has gray one. To exercise the ECT sensor, unplug it then use the ohmmeter to check the resistance across the terminals; at 68 degrees F, the value should be around 2,100 to 2,900 ohms. Next, crank the engine and let the engine warm up to the operating temperature point and the resistance should be in the range of 300 to 330 ohms at 176 degrees F.Since the readings are normal, look at reference voltage of PCM at the senses connector which should be about 5 volts. When replacing the sensor, use Teflon sealing tape on the threads to avoid leakage and corrosion, to remove the sensor uncover the electrical connector and unbolt the old sensor from the engine. Replace the new sensor immediately to prevent continuous leakage of the coolant; tighten the sensor nut well before reconnecting the electrical connection. After: check coolant level and add more if it is needed, start engine and wait until engine temperature indicator reaches normal level, check for coolant leaks, check coolant level in the expansion tank when the engine is cold.

Check the coolant level, adding coolant if necessary. Start the engine and allow it to reach normal operating temperature, then check for coolant leaks.

The temperature gauge sending unit on DOHC engines is located in the water outlet tube.

According to the VIN, PN 22630-51E00 is correct and is available. Nissan does not sell the connector separate from the wiring harness