Learning More About the INPUT/TURBINE Speed Sensor


Turbine Speed Sensor

A turbine speed sensor, also known as an input speed sensor, is used to evaluate transmission performance and other turbine components in order to measure the performance of the turbine. It also senses the turbine’s rotation speed, which indicates the transaxle’s input revolution. The electronic transmission control detects gear change timing and adjusts engine torque and hydraulic pressure in response to varied conditions.

This sensor detects turbine performance without coming into touch with the rotating movement of phonic or toothed wheels by using several operating principles such as Hall effect, magnetoresistive, and inductive.

It outputs a digital frequency signal for Hall effect and magnetoresistive sensors, or a sinusoidal wave for inductive sensors.

Common location of the turbine speed sensor?

The turbine speed sensor, which is located on or inside your vehicle’s transmission, detects the RPM of the turbine shaft. When the PCM or TCM detects an anomaly in the turbine speed input, the Check Engine Light illuminates.

Common location of Input turbine speed sensor

What is the function of a turbine input shaft speed sensor circuit?

The input/turbine speed sensor measures how many revolutions per minute (RPM) the transmission’s input shaft is spinning. A three-wire sensor is typically used to read a reluctor ring in the transmission.

5 Common Symptoms of a Failed Turbine Speed Sensor

An issue with a car’s turbine sensor may have an impact on the vehicle’s overall performance. This could include decreased fuel efficiency and mileage, as well as less smooth gear changes. Alternatively, the automobile could enter limp mode, in which case it would remain in second gear to protect itself.

1.) Problem on shifting

The speed sensor will not be able to deliver correct speed signals if it is damaged. During this time period, the computer in the vehicle will not be able to regulate the transmission’s gear shifting functions. As a result, the transmission may change more quickly and roughly than typical as a result of this. Problems with the speed sensor can also affect the timing of the shifts, resulting in the transmission shift intervals being extended.

Automatic transmissions that are hydraulically operated are constructed and engineered to shift gently, and when they change harshly, they can cause damage to its internal components, which include hydraulic lines, valve bodies, and even the mechanical gears themselves. As soon as you find that your gearbox is shifting unevenly, you should contact a professional quickly and have it checked out to avoid these problems from occurring.

2.) The speedometer is not working properly.

There are a large number of automobiles that use vehicle speed sensors as the primary input for the operation of the speedometer. When this speed sensor fails, the speedometer may display irregular readings or, in certain cases, no readings at all, depending on the situation. Despite the fact that you can continue to drive your vehicle without a functioning speedometer, not knowing how fast you are traveling will make driving more difficult and maybe dangerous. It is possible that you will have difficulties with the police, particularly if there are speed limits in effect in your area. It can also result in accidents and other complications.

If you discover that your speedometer has stopped working suddenly, it is likely that you have a defective speed sensor in your vehicle. The speed sensor in your car is no longer capable of displaying the vehicle’s travel speed. It is preferable if you have it repaired as soon as possible.

3.) The check engine light is illuminated.

If the signals from the speed sensors are no longer received by the engine control unit, the check engine light and diagnostic issue code will be illuminated. When the computer in your car detects that your exhaust emission is increasing and is over the allowed limits for environmental toxins, the check engine light may also be illuminated on your dashboard. If you want to find out what caused the check engine light to illuminate, you can connect your vehicle to an OBD-II scan tool and run diagnostics on it. After the speed sensor faults have been identified and corrected, the mechanic will then reset the trouble codes on the vehicle.

4.) There are problems with the cruise control.

In addition, because the sensors monitor both the input and output shaft speeds, the speed sensors are important in the monitoring of the cruise control. Inaccurate data from faulty speed sensors to the car’s computer, which can lead the computer to deliver an error code to the ECU (engine unit control unit), and cause the automobile to malfunction. If this occurs, the ECU may be triggered to turn off the cruise control, thereby making it inactive as a preventive measure.

This occurs because the system will require the data from the speed sensor in order to maintain your automobile running at a steady speed. Consequently, if the speed sensor fails to transmit the necessary signal to the car’s computer, the cruise control will be instantly turned off and disconnected.

The instant you become aware that you are experiencing problems with your vehicle’s cruise control, such as the system failing to engage when you press the button, take it to a mechanic for inspection and testing to establish whether a faulty speed sensor is the source of the problem.

5.) The torque converter in the transmission is unable to engage the clutch.

When the transmission torque converter fails to apply the clutch and establish a mechanical contact between the transmission and the engine, this is one of the most typical speed sensor failures. This can occur when the vehicle speed sensor does not provide accurate information to the car’s computer, which is because the torque converter is triggered at a preprogrammed speed when the vehicle is moving. Increased fuel consumption, slippage, and transmission overheating are all possible consequences of this particular problem.

4 OBD DTC Code Related to INPUT/TURBINE Speed Sensor

P0715 is the most often encountered failure code for turbine speed sensors. In this case, the communication between the car’s electronic control module (ECM), also known as the PCM (Power-train control module), and the transmission control module is the source of the problem (TCM). If the TCM does not receive a value that is within the range of RPM or speed values specified by the manufacturer, the transmission will not be able to read the RPM, resulting in this failure code being displayed.

P0718 Input/Turbine Speed Sensor Circuit Intermittent

Because the presence of a P0718 DTC indicates that the vehicle’s computer is unable to precisely determine the speed of the transmission’s input shaft, there will most likely be severe drivability concerns, or the car may not be drivable at all, while the DTC is present.

P0717 Input/Turbine Speed Sensor Circuit No Signal

The diagnostic trouble code (DTC) P0717 stands for “Input/Turbine Speed Sensor “A” Circuit No Signal,” and it indicates a problem with the sensor. It means that one of your vehicle’s systems has detected a problem with the speed sensor or its circuit. A break in the circuit occurs when the grooves or notches pass in front of the sensing element. As a result, an electronic pattern is created.

P0716 Input/Turbine Speed Sensor Circuit Range/Performance

The P0716 code indicates that the computer in the vehicle has received an inaccurate input signal from the engine speed sensor in some way. The computer will be unable to design the optimal shifting strategy for the transmission if the input information is not accurate.

P0715 Input/Turbine Speed Sensor Circuit Malfunction

The Input/Turbine Speed Sensor Circuit Malfunction error code P0715 is defined as follows: This indicates that the transmission is unable to read the engine’s revolutions per minute, preventing it from shifting properly and resulting in irregular and difficult transmission.


This tutorial is simply compiled and researched with love by Erwin Salarda.