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34

Measurements and analysis with the VAS 5051

Coolant temperature sender G62

J 220

T80/70

T80/54

The signal from the coolant temperature sender G62 is used by the engine control unit as a cor- rection factor for the basic injection timing depending on the engine temperature (warm-up period).

G 62

1

2

3

4

G2

The adjacent circuit diagram shows the electrical connections on the coolant temperature sender G62 of the 1.8 l/92 kW petrol engine.

The electric signal for subsequent analysis by the DSO is measured at the following contacts:

DSO 1 (+)

DSO 1 ()

Contact 1 (signal) Contact 3 (ground)

202/039

The coolant temperature sender G62 controls the coolant temperature gauge in the dash panel insert.

1

The temperature signal between contacts 1 and 3 can be displayed as a curve by intermediate connection of an adapter lead from the V.A.G. 1594A test set.

3

The individual adapter leads are described on page 30.

The following curve is obtained:

202/074

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