Starting a car with the IM608 ii pro diagnostic tool is a straightforward process. First, establish a connection between the IM608 and the vehicle's OBD-II port. Power on the IM608 and select the vehicle's make and model from the menu. Then, access the key programming function and carefully follow the on-screen instructions provided by the tool. This typically involves inserting a new key into the ignition and following specific prompts. Once the programming is complete, test the newly programmed key to ensure it starts the vehicle smoothly.