Transmission Speed Sensor: Testing and Inspection

SPEED SENSOR n-ab
If the displayed output speed in Status monitoring does not agree with the actual status, measure the resistance of the Output Speed Signal (DZF) by means of the universal adapter with the control unit disconnected and ignition switched "Off".

9-pin Connector On Gearshift Unit:

If value deviates, check wire as well as plug-and-socket connection from control unit to speed sensor and repair if necessary. If OK.: Repair or replace speed sensor.