Dynamic Testing of the Speed Sensors

Dynamic Testing of the Speed Sensors:

Uniform Progression of Speed Signal (Signal OK.):

Connect oscilloscope of BMW Service Tester as follows:

- Terminal D+ blue to speed sensor signal
- Frequency (-) black to speed sensor ground
- Frequency (+) blue to terminal 1 black

*M* 13 select frequency and enter 80 Hz

*M* 22 select oscilloscope

Uniformly turn wheel by hand. A sinusoidal curve must appear (amplitude and period duration change depending upon the rotary speed).

Checking for interchanged Wheel Speed Sensors:

Perform dynamic wheel speed sensor test in accordance with Schematics or to "Pin Assignments" at each wheel.

If no signal can be seen on the oscilloscope from one wheel, turn the opposite wheel. If a signal is displayed, this indicates that the wheel speed sensor wiring has been interchanged.

__________________________________

*M*: Multimeter; Select multimeter on the BMW SERVICE TESTER. Select indicated multimeter function.