Nissan 22630-7Y000 Engine Coolant Temperature Sensor

First of all, you can remove the engine cover, remove the air intake duct, and drain the engine coolant. Next, disconnect the electrical connector from the ECT sensor. The ECT sensor is placed on the inner side of the left cylinder head, near the front upper corner of the head. Using a new sealing washer, install the ECT sensor and tighten it to the torque. Refill the cooling system.

Like the intake air temperature sensor, the engine coolant temperature sensor is a thermistor that changes its resistance with the temperature. For 1993 and 1994 models, it is located in the coolant inlet pipe behind the distributor. However, for 1995 and later models, this sensor is found in the coolant outlet pipe behind the left (front) cylinder head. The sensor is responsible for sensing coolant temperature by changing resistance inversely as temperature rises. This information helps PCM determine how hot an engine is operating. A trouble code will be set when there is a problem with this circuit in wiring or connections with the sensor itself. Before removing this unit, check PCM's voltage source and ground circuits. Disconnecting electrical connector from sensor and connecting a voltmeter to harness connector's two terminals should be done first. Turning ignition key On-voltage should read about 5.0 volts. If voltage reading isn't correct, inspect wire from sensor to PCM. Incase circuits are okay have PCM checked at dealer service department or other properly equipped repair facility. Attach an ohmmeter to both terminals of the sensor while engine cool and measure resistance across them.Reinstall electrical connector to sensor and start engine, allowing it to reach normal operating temperatures then disconnecting plug and measuring resistance again.Read your measurements on resistance chart.If you get incorrect readings for test results on resistance of sensor, replace the latter.A more accurate check can be made by immersing tip of senor into container filled with water once again heat up this water on stove while observing changes in resisitivity of that area.Wating until Engine has completely cooled down perform this procedure.Before installing new detector wrap threads with Teflon sealing tape so as to prevent leakage and corrosion of thread.Disengage electrical connector and remove detector from coolant pipe.To keep loss of coolant minimal install new detector's as fast as possible.Ensure that you connect electrical connector securely then tighten detector.Check level of coolant and add it in case of any lack.Start engine and allow it to warm up to normal operating temperature, then inspect for coolant leakage.After engine warmed up and cooled back measure the coolant level in the expansion tank.

The coolant temperature indicator system consists of a temperature gauge mounted in the instrument panel and a coolant temperature sending unit mounted on the engine. The temperature gauge sending unit on SOHC engines is located adjacent to the distributor, while on DOHC engines, it is located in the water outlet tube. This is the coolant temperature sensor for the computer on some models. 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, the wiring between the dash and the sending unit should be checked for a short circuit to ground. If the gauge is inoperative, the circuit can be tested by briefly grounding the wire to the sending unit while the ignition is On, but the engine is not running for safety. If the gauge deflects full scale, the sending unit should be replaced. If the gauge doesn't respond in the test, the temperature gauge wiring circuit should be checked by a dealer service department or other qualified automotive repair facility. If the sending unit must be replaced, it should be unscrewed from the engine and the replacement quickly installed. A conductive sealant should be used on the threads, not Teflon tape. The engine should be cool before removing the defective sending unit. There will be some coolant loss as the unit is removed, so be prepared to catch it. The coolant level should be checked after the replacement part has been installed.

First of all, you can remove the engine cover, remove the air intake duct, and drain the engine coolant. Next, disconnect the electrical connector from the ECT sensor. The ECT sensor is placed on the inner side of the left cylinder head, near the front upper corner of the head. Using a new sealing washer, install the ECT sensor and tighten it to the torque. Refill the cooling system.

In the engine situated at the left area is where a coolant temperature sensor is located. First remove the engine cover and air intake duct, then drain some coolant from the engine to reduce spillage of coolant. After that, disconnect electrical connector from ECT sensor by depressing the tab on electrical connector. Remove the sensor and discard the washer, as a fresh one should be fitted. To have it fixed back follow what you did when you removed it. Lastly recharge your cooling system.

The cooling system should be refilled.