Test I: No Module/Network Communication - No Power to The Diagnostic Tool

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

I1-I4:

I4 Continued:

Normal Operation
The diagnostic tool is connected to the DLC C251 to communicate with both the high speed and medium speed controller area network (CAN), as well as with the international standards organization (ISO) 9141 communication network. If communication cannot be established, the diagnostic tool and the DLC C251 must be checked for damage. If the diagnostic tool and the DLC C251 are OK, circuits 956 (OG/LG), 570 (BK/WH), and 57 (BK) must be checked for an open condition.

Possible Causes
- DLC C251
- diagnostic tool
- circuit 57 (BK) open
- circuit 570 (BK/WH) open
- circuit 956 (OG/LG) open