Materials:
* Multimeter
* Key (size may vary depending on model)
Procedure:
1. Determine the location of the automatic transmission temperature sensor: Usually it is located on the automatic transmission housing, next to the pan or oil filter.
2. Disconnect the battery: This will ensure safety when working with electrical components.
3. Find the sensor connector: Locate the connector to which the automatic transmission temperature sensor is connected. It usually has two or three wires.
4. Remove the connector: Press the latch or disconnect the connector from the sensor.
5. Connect the multimeter to the connector: Connect the red lead of the multimeter to the power terminal (usually the yellow or red wire) and the black lead to the ground terminal (usually the black or brown wire).
6. Set the multimeter to ohmmeter mode: Select the lowest resistance range (usually less than 200 ohms).
7. Immerse the sensor in fluid: Place the sensor in a container of clean transmission fluid.
8. Heat the fluid: Slowly heat the fluid until it reaches the specified operating temperature for the sensor (usually around 80-100°C).
9. Monitor the multimeter readings: A decrease in resistance when the liquid heats up indicates that the sensor is working properly.
10. Test Resistance at Different Temperatures: Take resistance readings at different temperatures to compare them with the sensor’s stated performance.
Interpretation of results:
* If the resistance decreases when heated, the automatic transmission temperature sensor is working.
* If the resistance does not change or jumps sharply, the sensor is faulty and requires replacement.