In order to use ProScan, the vehicle must be OBD-II compliant, and you must use the appropriate interface (VPW, PWM, or ISO) in order to communicate properly. The interface is the small box that attaches between the vehicle and the computer.

Step #1: Assemble the two cables and the appropriate interface as shown in the diagram below:

Step #2: Then connect the end of the serial cable to your computer’s serial port. If your computer does not have a serial port, you will need to use a USB to Serial converter, which can be found in the PDA section of your local computer store for around $30.

Step #3: Connect the other end of the OBD-II cable to the vehicle’s under-dash connector. It will be located within 1-meter (3-feet) of the steering wheel.

You should now have your computer connected to the vehicle via the cables and interface.

Step #4: Start the vehicle. (On some vehicles, you can connect and analyze sensor data without starting the engine, but the key must be turned to the ON position.)

Step #5: Launch the ProScan software and enable communications. ProScan should then initialize and connect with the vehicle. If not, check your cable connections and make sure you are using the appropriate interface.