Model motor resistance of driving vehicle

Hi

I have model electric motor in simulink with simcape DC electric motor and attached rotational inertia and everything work ok. Now I want to connect the model of the electric motor with model of vehicle, problem the model is not from Simcape is from Carsim. I attached the electric motor on the vehicle, I measure the torque and angular speed of the shaft of the motor and connect the signals with the model of the vehicle, the vehicle drives. Now the motor drive like no load on it I need some output I don't know which and how to connect to the electric motor to simulate resistance of driving, rotating inertia.

Thanks for your help

Ile