Speed sensor location
*Nissan Navara with automatic transmission has two speed sensors.
* One sensor is located on the transmission control unit.
* The second sensor is located on the rear axle output shaft.
Speed sensor function
* Speed sensors are designed to measure the speed of the transmission and rear axle.
* This information is sent to the Engine Control Module (ECM) to calculate vehicle speed, odometer readings, and shift control.
Types of speed sensors
* The transmission speed sensor is usually a Hall sensor.
* The rear axle speed sensor is usually a variable resistance sensor.
Diagnostics of speed sensors
*Signs of a bad speed sensor include:
* Inaccurate speedometer readings
* Incorrect operation of the odometer
* Problems with gear shifting
* You can use a diagnostic scanner to diagnose speed sensors.
*You can also check the power and grounding of the sensors using a multimeter.
Replacing speed sensors
*Replacement of the transmission speed sensor requires removal of the transmission control module.
* Replacement of the rear axle speed sensor requires removal of the rear driveshaft.
*Replacing speed sensors requires special tools and knowledge. It is recommended that you contact a qualified mechanic.