Test Point 10

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 degrees C...100 degrees 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 degrees C: approx. 1 KOhm
- 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
- 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 ground Voltmeter display: 0 V
- 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 Ohms.
- Ohmmeter on instrument cluster plug II pin 5 and plug on temperature sensor pin 3 Ohmmeter display: < 5 Ohms.
- See also Input signals chapter, Test point 9, and Drive links chapter "Coolant warning light" and "Coolant temperature"