2003 Ford F150 data bus communication network protocol is vital in dia... 1 of 1 http://www.automotivetroubleshootingsecrets.com/2003_F150_network... 2003 Ford F150 network protocol is an example of multiplex networking. Now I will show you how to check NO COMMUNICATION problems when this message is displayed in your scanner by using cheap tools like the common voltmeter. Shown below is a typical computer data bus diagram. 6/21/2018, 7:13 PM