Test Point 10

Checking The Actual Values

In the Actual values menu item, the current values of the following parameters can be read out and checked:

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 Ohm

- 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 lion 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, Test point 9, and Drive links "Coolant warning light" and "Coolant temperature".