Communication With Any System Is Not Possible

Communication with Scan-Tool is not possible.
(Communication with any system is not possible)

DETECTING CONDITION:

INSPECTION PROCEDURES
CHECK THE POWER SUPPLY CIRCUIT FOR THE DIAGNOSIS
Measure the voltage between terminal 9 of the data link connector and body ground.
Specification approximately B+
Is voltage within specification?
YES
Check the ground circuit for the diagnosis.
NO
Repair an open in the wire. Check and replace fuse (15A) from the engine compartment junction block.





CHECK THE GROUND CIRCUIT FOR THE DIAGNOSIS
Check for continuity between terminal 5 of the data link connector and body ground.
Is there continuity?
NO
Repair an open in the wire between terminal 5 of the data link connector and ground point.