The automatic transmission speed sensor (VSS) generates an electrical signal that corresponds to the speed of the vehicle. This signal is sent to the ECU, which uses it to control the operation of the transmission.
Automatic transmission speed sensor resistance
The resistance of the automatic transmission speed sensor depends on its type, design and manufacturer. However, in general, general resistance ranges for different types of sensors are given below:
Sensor type | Resistance range
——- | ——–
Magnetoresistive | 100 Ohm – 2 kOhm
Hall | 50 Ohm – 1 kOhm
Alternator | 10 Ohm – 100 Ohm
Incremental encoder | 100 kOhm – 1 MOhm
Factors influencing resistance:
* Temperature: The resistance of most automatic transmission speed sensors varies with temperature.
* Vibration: Vibration can cause resistance to change due to physical changes in the sensor.
*Wear: Sensor resistance may increase over time due to wear and tear on internal components.
Diagnosing problems with speed sensor resistance:
If there is a problem with the transmission speed sensor resistance, the following symptoms may appear:
*Inaccurate speed readings
* Incorrect gear shifts
*Transmission emergency mode
*Check engine indicator (CEL) on dashboard
To diagnose a problem with the resistance of the automatic transmission speed sensor, you can use the following methods:
* Check the sensor resistance using an ohmmeter.
* Check the integrity of the wiring and connectors between the sensor and the ECU.
* Check the operation of the ECU itself using a scanner.
If necessary, replace the faulty sensor.