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

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 check voltage circuit 40 (LB/WH), for an open or short to ground. Ground circuits 57 (BK) and 567 (LB/YE) must be checked for an open condition.

Possible Causes
- fuse
- DLC C251
- diagnostic tool
- circuit 40 (LB/WH) open or short to ground
- circuit 57 (BK) open circuit
- circuit 567 (LB/YE) open circuit