Test P: No Module/Network Communication - No Power To The Diagnostic Tool
PINPOINT TEST P: NO MODULE/NETWORK COMMUNICATION - NO POWER TO THE DIAGNOSTIC TOOLP1-P3:
P4:
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), UART-based protocol (UBP), and 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, circuit 40 (LB/WH) must be checked for voltage and 1205 (BK), and 1203 (BK/LB) must be checked for an open condition.
Possible Causes
- DLC C251
- diagnostic tool
- power (overload protected), circuit 40 (LB/WH) short to ground or open
- ground circuit 1203 (BK/LB) open circuit
- ground circuit 1205 (BK) open circuit