car will not start.

Hello, If there is no communication with the vehicle, there may be a bad fuse (#38, 10A) in the vehicle. This fuse provides power the the DLC (the plug for the scan tool). Check that fuse first, then you will have to move on to pinpoint testing. The ECM is suspect when there is no connection for a scan tool. Turn the key to the on position with the engine off. See if the check engine light comes on. If it comes on, the ECM is powered up, if not, it isn't. You may have a bad fuse or relay for the ECM, (engine control module), and once you establish power you will need to check for pin #13 on the datalink connector to see what voltage is present with the key on, engine off.