How to test a temperature sensor with a multimeter

How to test a temperature sensor with a multimeter. Keeping your vehicle or any device long-lasting will need some care with accurate tests from time to time. If your vehicle is overheating, check the temperature sensor. If you want to test it and haven’t any idea how to check the sensor, don’t worry!

How to test a temperature sensor with a multimeter

We have provided a handy guide that is simple and saves your time and money. You can test the sensor even at your home, and by following easy steps, you will get the desired results.

Signs of a faulty temperature sensor

  • internal contacts short-circuited
  • damaged internal contact
  • sensor display zero resistance
  • overheating of the device
  • damaged wires

Effects of the damaged sensor on the vehicle

  • If you avoid testing and replacing the defective temperature sensor, it will affect the vehicle’s efficiency.
  • The cooling fan stops working
  • Affect the transmission and temperature gauge
  • disturb the ignition timing
  • Causes mixing and excessive consumption of fuel.

Procedure for Testing the Temperature Sensor

All you need is recommended tools with a digital multimeter device to check the sensor and even replace it at home.

Prerequisites

Essential requirements

  • Digital Multimeter Device
  • Paper
  • Pencil
  • Wrench

Safety measures

  • Place the vehicle in a stable place.
  • Remove the ignition key to avoid any mishaps like shocks
  • Switch off the engine
  • Wait for 15 minutes until the engine gets cool
  • Wear gloves and safety equipment to avoid burns and shocks or any accidental mishap.

Locate the sensor

Locate the thermostat next to it: a small, black box connected to a wire harness will be present. It is the temperature sensor. Location of the sensor may vary in terms of:

  • Vehicle model
  • Large vehicles engines
  • Check the vehicle manual for sensor location or look for an online manual of your car.

Once you have located the sensor, now remove it from the vehicle. Be careful not to damage any other part or harness wiring while unplugging the sensor. Gently remove the sensor connectors from the wire harness and place them on the hard surface.

Connect the Multimeter to the Temperature Sensor

  1. Take the multimeter device and set it to the voltage parameter.
  2. Connect the leads of the multimeter to the connectors on the temperature sensor.
  3. The plug-end of the temperature sensor comprises three connectors that resemble metal prongs.
  4. Connect the red lead of the multimeter to the far right of the connector. Take the black lead and connect it to the far left connector.
  5. The function of connectors is to connect the sensor to
  6.  the
  7. wire harness.
  8. Keep the sensor attached to the multimeter.

Obtaining Standard Value in Cold Water

(This will act as a desired standard measurement)

  1. Take a small graduated cup, add ice water and fill in up to 180 ml. check the temperature.
  2. It must be 33 °F (1 °C).
  3. Take the multimeter and select the DC parameter. It displays the results in voltage.
  4. At this time, the sensor must be in connection to the device.
  5. To activate it, turn on the power button.
  6. After that, place the sensor in the cold water and observe the multimeter for the results.
  7. Note down the results.
  8. If you get 5 volts in cold water, it obeys the standard.
  9. But if no reading is displayed, the temperature sensor is defective.

Obtaining Standard Value in Hot Water

(This will act as a desired standard measurement)

  1. For the hot test, take a small graduated cup, add boiling water and fill in up to 180 ml.
  2. Take the multimeter and select the DC parameter. It displays the results in voltage.
  3. At this time, the sensor must be in connection to the device.
  4. To activate it, turn on the power button.
  5. After that, place the sensor in the boiling water and observe the multimeter for the results.
  6. Note down the results.
  7. If you get 25 volts in boiling water, it obeys the standard.
  8. But if no reading is displayed, the temperature sensor is defective.

Conclusion

A multimeter provides accurate results. Grab the device and test the sensor.

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