So, got some time to fiddle with it, but still no luck.
Unplugged the green connection at the back of the CCM, which in my case looks like this.
No corrosion or signs of short circuits.
I've cut the purple and brown wire and connected the sensor to it - no change.
The sensor's resistance is about 2.8kOhm, which corresponds with the table. The resistance in the brown and violet cables (with the green socket plugged in) is about 14kOhm. There's current flowing through the 2 wires when plugged in as well.
No matter whether the sensor is connected or not, the reading in VIDA says 100 degrees C.
What else can I try? A different sensor?