Speed Sensor N-Ab

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If the displayed output speed in BMW service tester status monitoring does not agree with the actual status, measure the resistance of the DZF by means of the a universal adapter with the control unit disconnected and ignition switched off. See CONTROL UNIT SPEED SENSOR CHECK table. If value deviates, check wire as well as plug-and-socket connection from control unit to speed sensor and repair if necessary. See Fig 1 . If okay, repair or replace speed sensor.

CONTROL UNIT SPEED SENSOR CHECK

Pin No. At Universal Adapter	Pin No. At 2-Pin Transmission Connector	Operation	Nominal Value
20/14	1/2	None	Approximately 3 k/Ohms

Fig 1: Identifying Gearshift Unit Connector

Courtesy of BMW OF NORTH AMERICA, INC.