Inspection of Individual Part

Remove the VSS sensor. (See VEHICLE SPEEDOMETER SENSOR (VSS) REMOVAL/INSTALLATION .)
Measure resistance between the terminals of the VSS speed sensor.
- If not as specified, replace the VSS sensor.
- If it is normal, replace the harness.
Resistance (ATF temperature: 20 °C {68 °F}) 513-627 ohms

Fig 1: Measuring VSS Speed Sensor Resistance
Courtesy of MAZDA MOTORS CORP.
Install the VSS sensor. (See VEHICLE SPEEDOMETER SENSOR (VSS) REMOVAL/INSTALLATION .)