Measurements and analysis with the VAS 5051
Coolant temperature sender G62
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).
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)
The coolant temperature sender G62 controls the coolant temperature gauge in the dash panel insert.
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.
The individual adapter leads are described on page 30.
The following curve is obtained: