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The function of sensors in a transmission.



These are all the transmission sensors and their function.

The Powertrain control module microprocessor is the brain of the vehicle. It is fed information by sensors around the car. In the transmission they are responsible for shift timing and other aspects of shifting. The transmission control module or “TCM” is another microprocessor used to regulate the function of the transmission. These microprocessors are fed information from the sensors. Here is a list of some of the sensors around your car and their functions. Sensors also alert the main processor if their is a malfunction and the code is stored in the system so that our technicians at our Port St. Lucie Transmission Repair Shop can properly diagnose your transmission problems.

The Transmission Input Speed Sensor
This sensor measures the revolutions per minute or RPMs of the input shaft. The Torque convertor sends the proper pressure to the clutches and planetary gear assembly to make the vehicle move. When the automobile is moving, the transmission input shaft rotates at the same RPM as the engine. Your car's speed relies on the input speed and gear ratio. If it malfunctions this will alert the PCM that there is a specific problem.

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The Transmission Output Speed Sensor
This sensor measures the speed of the "output shaft" in revolutions per minute.

Vehicle Speed Sensor
This sensor measures pure speed. If this sensor fails, the transmission will malfunction. This can make it appear as if the transmission is damaged. So you should have a trusted transmission shop that will only replace the defective sensor and not get into costly repairs.

Airflow sensor
This measures air flow into the engine intake. If this sensor fails it can make the transmission shifting become erratic. We may be able to just change out the sensor and everything is restored to normal working order.

Turbine Speed Shaft Sensor
This measures the shaft's speed rotation inside the transmission which in turn determines the amount of clutch slipping. This will tell us if there is a problem with the clutch or the sensor.

Intake Air Temperature Sensor
This tells the PCM the temperature of the air going into the engine's intake. It also controls the amount of air that is mixed with the fuel which is part of the pressure control system for the transmission. If this sensor malfunctions it can cause abnormal shifting.

Coolant Temperature sensor
The PCM uses this sensor to also regulate the air mixture ratio with fuel and also measures the radiator fluid temperature and restrict the clutch in cooler temperatures.

Throttle position sensor
This measures throttle movement and sends data into the TCM that a sudden increase or decrease in acceleration is happening. A bad sensor can cause shifting issues that would appear as if the transmission is failing.

So as we see, sensors play a big role in function and diagnosis. It is important to know that if you seem to be having transmission problems that sometimes the problem could just be a faulty sensor. But sometimes the sensor is picking up a larger problem. Our reputation as the most trusted repair shop in St. Lucie County proceeds us at AA One Transmissions in Port St. Lucie, Florida because we have thousands of loyal customers who know they can trust us. Read their stories here.