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Measurements and analysis with the VAS 5051

Actuator analysis with the DSO

Injectors N30 ... N33

J 220

The injectors are located in the manifold upstream of the associated inlet valve.

+/87F

234

234 15A

234a

10e/8

T80/73

T80/80 T80/58 T80/65

2

2

2

2

1

1

1

1

N30

N31

N32

N33

The injectors are controlled by the engine control unit by means of electric pulses. The injection quantity is controlled by the engine control unit by means of the injection period since the cross-section of the opening and the difference in pressure are constant.

The adjacent circuit diagram shows the electrical connections of the individual injectors of the 1.8 l/ 92 kW petrol engine.

202/040

DSO 1 (+)

Contact 2 (signal)

DSO 1 ()

Contact 1 (positive)

The electric signal for subsequent analysis of an individual injector by the DSO is measured at the following contacts:

The injection signal can be displayed as a curve by intermediate connection of an adapter lead from the V.A.G. 1594A test set into the wire to an injector with the DSO measuring lead of the VAS 5051 tester connected.

The individual adapter leads are described on page 30.

Faults can be detected compared to a defined curve.

The following curve is obtained:

202/076

DSO measuring lead

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