Test Point 13

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 13
Outside temperature sensor value

- Engine off
PST2 display:

Tester display approximately equals the ambient temperature

Troubleshooting:
- Warm sensor with fingers and observe the increase in temperature on PST 2. If no change in temperature is determined or displayed:
- Disconnect outside temperature sensor
- Switch ignition on
- Measure the voltage at the outside temperature plug, pin 1 and pin 2
Voltmeter display: approx. 4.5 - 5 V

- Ohmmeter on pin 1 and pin 2 on the outside temperature sensor
Ohmmeter display at 20 °C: 2.5 - 3 kOhms

- Switch off ignition
- Pull off plug I on the instrument cluster
- Switch ignition on
- Measure the voltage between plug I on outside temperature sensor, pin 1 and ground

- Switch off ignition
- Ohmmeter on outside temperature sensor plug, pin 2 and ground
Ohmmeter display: [<] 5 Ohms

- Ohmmeter on instrument cluster plug I pin 17 and plug on outside temperature sensor pin 1
Ohmmeter display: [<] 5 ohms

If no fault is established in the wires or on the outside temperature sensor, replace the instrument cluster.