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

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

N1-N3:

N4:

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 communications can not be established, the diagnostic tool and the DLC C251 must be checked for damaged. If the diagnostic tool and the DLC C251 are OK, circuits 570 (BK/WH), 1001 (WH/YE) and 1205 (BK) must be checked for an open condition.

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