Test point 23 Speedreference mark sensor

This test can only be performed with an oscilloscope. For this purpose, connect and adjust a workshop oscilloscope in accordance with the manufacturer's instructions.

Connect the positive tester lead via a test lead to the control unit plug terminal 47 and the negative tester lead via a test lead to control unit plug 48.

Crank the engine with the starter. Sinusoidal oscillations of at least 3 V (speed pulses) and an intermediate higher amplitude (reference mark) must be displayed on the screen.

If the voltage signal is too small (< 3V), the distance between the sensor and the gear ring may be incorrectly adjusted.

1 - Speed signal

2 - Reference mark signal

Sensor distance: Between gear ring and sensor: 1 mm± 0.2 mm.

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