Test Point 10

TEST POINT 10
Coolant Temperature

Note:
In the Actual Values menu item of the PST 2, the current values of the following parameters can be read out and checked.

- Engine off (with engine cold)

PST 2 display: Tester display corresponds to the ambient temperature.

- Engine runs at idle speed at operating temperature

PST 2 display: Tester display corresponds to the coolant temperature of 8O °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

Display: approx. 1 Kohm @ 20 °C

- Switch ignition on

- measure voltage at plug connection X3/1, pin 29 and pin 30 on pin side

Display: approx. 5 Volts

- 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

Display: 0 Volts

- measure the voltage between instrument cluster plug I, pin 24 and ground

Display: 0 Volts

- Switch off ignition

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

Display: < 5 ohms

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

Display: < 5 ohms

See also:
- Input signals Test Point 9 Test Point 9
- Drive links / Coolant warning light, Coolant temperature Drive Links