If you want to do frequency response estimation, then please refer to this example . You will want to add linear analysis points in exactly the same way as shown there.
In general, through, I would recommend to follow the workflow described here. I tried it and it works fine on your model. The only thing is that when you inject step change into the model, make step amplitude high enough - I tried 30. Then identify first order transfer function from simulation data and use it for PId tuning.
Hope this helps.
