Test S: No Module/Network Communication - No Power To The Diagnostic Tool

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

S1-S3:

S4:

Normal Operation
Under normal operation the diagnostic tool is connected to the data link connector (DLC) C251 to communicate with the standard corporate protocol (SCP) communications network, universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communications network, and international standards organization (ISO) 9141 communications networks. If communications 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, circuits 1001 (WH/YE), 1205 (BK), and 570 (BK/WH) must be checked for an open condition.

Possible Causes
- DLC C251
- diagnostic tool
- circuit 570 (BK/WH) open
- circuit 1001 (WH/YE) open
- circuit 1205 (BK) open