Test point

Coolant temperature

Engine off (with engine cold) PST2 display:

Tester display corresponds to the ambient temperature.

Engine runs at idle speed at operating temperature PST2 display:

Tester display corresponds to the coolant temperature of


Resistance values:

Switch off ignition

Disconnect plug connection X3/1

Ohmmeter on pin 29 and pin 30 on the sleeve side Ohmmeter display at 20° C: approx. 1 Ki2

Switch ignition on

Measure voltage at plug connection X3/1 pin 29 and pin 30 on pin side

Voltmeter display: approx. 5 V

Switch off ignition

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