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Measurements and analysis with the VAS 5051

Sensor analysis with the DSO

J 220

Engine speed sender G28

T80/67 T80/63 T80/56

The engine speed sender is a speed and refer- ence marker sender. The engine does not run without this signal.

3

2

1

The adjacent circuit diagram shows the electrical connections on the engine speed sender G28 of the 1.8 l/92 kW petrol engine. The signal for analysis by the DSO is measured at the following contacts:

DSO 1 (+) DSO 1 (–)

  • Contact 1 (signal)

  • Contact 2 (ground)

G 28

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Remove the connector from the engine speed sender G28 and connect again using the meas- uring leads

  • V.A.G. 1594/1

  • V.A.G. 1594/2 and

  • V.A.G. 1594/19

from the V.A.G. 1594A test set.

The speed signal between contacts 1 and 2 can then be displayed as a curve on the DSO.

The following curve is obtained:

123

V.A.G. 1594/1

V.A.G. 1594/2

DSO measuring lead

V.A.G. 1594/19

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