Test L: No Module/Network Communication - No Power to the Diagnostic Tool

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

Test L1-L4:

Normal Operation
The diagnostic tool is connected to the data link connector (DLC) C251 to communicate with the controller area network (CAN), universal asynchronous receiver transmitter (UART)-based protocol (UBP) communications network, and the international standards organization (ISO) 9141 communications 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 40 (LB/WH), 57 (BK) and 567 (LB/YE) must be checked for an open condition.

Possible Causes
- DLC C251
- diagnostic tool
- circuit 40 (LB/WH) open circuit
- circuit 57 (BK) open circuit
- circuit 567 (LB/YE) open circuit