Test I: No Module/Network Communication

PINPOINT TEST I: NO MODULE/NETWORK COMMUNICATION - NO VOLTAGE TO THE DIAGNOSTIC TOOL

I1-I4:

I4 Continued:

Normal Operation
Under normal operation the diagnostic tool is connected to the data link connector (DLC) C251 to communicate with the controller area network (CAN), medium speed CAN, and international standards organization (ISO) 9141 communications networks. If communication can not be established, the diagnostic tool and the DLC C251 must be checked for damage. If the diagnostic tool and the DLC C251 are OK, ground circuits 57 (BK), 651 (BK/YE) and voltage circuit 1047 (LG/RD) must be checked for an open condition.

Possible Causes
- circuit 57 (BK) open
- circuit 651 (BK/YE) open
- circuit 1047 (LG/RD) open or short to ground
- fuse
- DLC C251
- diagnostic tool