Test point 10

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 80 °C...100 °C.

Troubleshooting:

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 K£2

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

90 25 Diagnosis/Troubleshooting, instrument cluster

Reconnect plug connection X3/1 Remove connector of temperature sensor Pull off plugs I and II on the instrument cluster Switch ignition on

Measure the voltage between instrument cluster plug II pin 5 and

Measure the voltage between instrument cluster plug I pin 24 and ground

Voltmeter display: 0 V

Switch off ignition

Ohmmeter on instrument cluster plug I pin 24 and plug on temperature sensor pin 2

Ohmmeter display: < 5 Q,

Ohmmeter on instrument cluster plug II pin 5 and plug on temperature sensor pin 3

Ohmmeter display: < 5 Q

See also Input signals chapter, Test point 9, and Drive links chapter "Coolant warning light" and "Coolant temperature"

90 25 Diagnosis/Troubleshooting, instrument cluster

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