Test J: The Overhead Console Does Not Respond To The Diagnostic Tool

PINPOINT TEST J: THE OVERHEAD CONSOLE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

J1-J2:

J2-J3:

Normal Operation
The overhead console (if equipped) communicates with the diagnostic tool through the standard corporate protocol (SCP) communications network circuits 914 (TN/OG) and 915 (PK/LB). Check the SCP circuits 914 (TN/OG) and 915 (PK/LB) between the overhead console C9013a and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open in the SCP network circuits, damage to the DLC C251, the overhead console C9013a, or a problem in the in-line connectors.

Possible Causes
- SCP data plus circuit 914 (TN/OG) open
- SCP data minus circuit 915 (PK/LB) open
- overhead console C9013a
- overhead console