BMW 13621433076 Temperature Sensor Water/Oil

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A common sensor is the engine coolant temperature (ECT), which is an NTC sensor, in which resistance opposes the temperature variation of the coolant. There is no reference current; it takes a 5-volt reference voltage, and any variation in the voltage drop across the sensor corresponds to coolant temperature changes. Where the ECT sensor input is either bad or unrealistic, the MIL turns on whenever OBD II fault thresholds are reached; the ECM replaces 80°C (176°F) as a minimum for engine running; ignition timing is set to a baseline maximum. The ECT sensor is located factor to the cylinder head below the throttle body. It is to be taken off by putting the rubber line in position and unscrewing the fastener using a screwdriver, while being ready to collect dripping fluids if the engine is still hot. Once the electrical connector is removed, you have to remove a couple of bolts to pull off the ECT sensor from the cylinder head; some coolant will drip, so be prepared. For removal, unscrew from the engine block and unbolt from the coolant line, while for installation reverse the process and add new copper sealing washer for the sensor, check and replace if necessary the O-rings on the coolant line and refill the lost coolant. Last of all look for any fault code and clear any that might have been stored in the ECM memory after replacement.

The ECT sensor is a two-pin temperature sensor that supplies the coolant temperature to the ECM and the instrument cluster. It works in a similar way to an NTC (negative temperature coefficient) sensor; its resistance drops as the temperature of the coolant increases. The ECM changes ignition timing and air/fuel mixture with regard to the water temp; the sensor receives a 5-volt reference voltage, the voltage drop across the sensor varying with water temperature. If ECT sensor input is out of range, or unrealistic expected by the ECM, the MIL comes on whenever the OBD II fault criteria is met, and to ensure the engine runs, the ECM sets an assumed ECT value at 80 degree Celsius plus its offset 176 degrees f, while setting ignition timing to a conservative basic setting. It is mounted at the rear of the engine, to the left of cylinder 6, beneath the intake port and above the intake manifold. It is located under the intake manifold and thus to get to it, the manifold must be taken off after the engine has cooled. The ECT sensor connector has to be removed to eliminate the connection, and the sensor should then be unscrewed from the cylinder head, be careful as there will be some lose coolant. For reinstallation a new copper sealing washer has to be used, lost coolant has to be replenished and the DTC had to be checked and then cleared of its memory by resetting the ECM.

The ECT sensor is an NTC sensor that decreases resistance as coolant temperature rises. The ECM adjusts ignition timing and air/fuel mixture based on the engine coolant temperature, receiving a 5-volt reference voltage from the sensor, with the voltage drop varying as the temperature changes. If the ECT sensor input is faulty or implausible, the MIL illuminates, prompting the ECM to assume a substitute value of 80 degrees Celsius/176 degrees Fahrenheit to maintain engine operation, while setting ignition timing to a conservatively safe basic level. The ECT sensor is positioned below the cylinder 6 intake port at the rear of the engine, underneath the intake manifold. To access it, the intake manifold must be removed after ensuring the engine is fully cooled. The ECT sensor connector should be disconnected, and the sensor unscrewed from the cylinder head, with precautions taken to catch any small amount of coolant that may escape. Installation follows the reverse order of removal, requiring a new copper sealing washer for the sensor, replacement of any lost coolant, and checking and clearing fault codes from the ECM memory.

The Engine Coolant Temperature (ECT) sensor is a Negative Temperature Coefficient (NTC) type sensor that measures the temperature of the engine coolant. As the temperature increases, the electrical resistance of the sensor decreases. The Engine Control Module (ECM) constantly monitors the value received from the ECT sensor to determine the engine's fuel mixture requirements. This information is used to maintain good driveability from a cold start up to normal operating temperature. The ECM controls the fuel mixture by controlling the activation of the fuel injectors. To test the ECT sensor, use a BMW service tester or a suitable Data Scan Tool (OST) to check for faults and read the values of the components. If this equipment is not available, you can proceed with the following steps. First, unplug the sensor and measure the coolant temperature as close as possible to the sensor location. Then, measure the resistance between the terminals of the sensor and compare the results to a chart. With the ignition switch ON, the sensor should receive 5 volts at one of the connector terminals. The other terminal is the return signal to the control unit and should not be used for voltmeter ground. To remove and install the ECT sensor, follow the specific instructions for your engine model. It is important to allow the engine to cool before removing the sensor to avoid burns. Unplug the electrical connector, use a 12 point 22mm thin wall deep well socket to remove the sensor by turning it counterclockwise. Remove the sensor along with its sealing washer. When installing the sensor, use a new sealing washer and tighten it to 10 ft. lbs. (14 Nm).

The switch should only be removed when the engine and radiator are cold.

First, disconnect the electrical connector at the ECT. Then, use a wrench to unscrew the sensor.

Either drain the cooling system or use a suitable plug to prevent foreign matter from entering the radiator.

After reinstalling, check for fault codes and reset the ECM memory.

When installing the new sensor, follow the same steps as removal, but make sure to use a new copper washer.

The coolant level sensor is mounted in the base of the coolant expansion tank.

To replace the ECT sensor, ensure the engine is fully cooled, then disconnect the ECT sensor connector and unscrew the sensor from the cylinder head, being prepared to catch a small amount of coolant. Installation involves reversing the removal process, using a new copper sealing washer, and replacing any lost coolant.

The sensor is positioned in the lower radiator hose on the right side of the radiator.

The ECT sensor is a negative temperature coefficient (NTC) sensor, where resistance decreases as coolant temperature rises.

When installing the new sensor, follow the same steps as removal, but make sure to use a new copper washer.

The ECT sensor is located on the left side of the coolant pump assembly, which is situated in front of the throttle housing.

When removing and installing the sensor, caution should be taken to avoid spraying hot engine coolant. The sensor should be tightened to the specified torque, and the cooling system should be topped off and bled.

Partially drain the cooling system or use a suitable plug to prevent foreign matter from entering. The sensor is located on the left-hand side of the cylinder head, under the intake manifold.