Chrysler Sci And Ccd Communications

John Diagnostician Redlands, California Posted  
Resource
Network Communications
2001 Dodge Ram 1500 Laramie 5.9L (Z) 4-spd (42RE)
No Communication No Start

The SCI transmit and receive circuits are used for PCM to scan tool communications. This is a known bad capture.

diag​.​net/file/f1501fi2b…

This is a known good capture.

diag​.​net/file/f4i1x4lf2…

This capture shows the same SCI circuits with the scan tool communicating in the OBD2 generic mode.

diag​.​net/file/f2jwdlcyd…

The last capture shows the CCD bus which is used for module to module communications.

diag​.​net/file/f77c92ost…

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