Test of warm-up valve

This function is used to open and close the warm-up valve for the AdBlue tank to check any electric problems in the valve.
Test conditions:
Procedure:
  1. Start the function.
  2. Activate the valve.
  3. Listen for an audible click from the tank warm-up valve.
  4. Observe that the AdBlue tank temperature increases.
  5. The function is done.