Chart C-3, CCDIC Display Reads System Problem

You are at this chart because the CCDIC display reads SYSTEM PROBLEM. This symptom is the result of a data link problem.

NOTE: Test numbers refer to test numbers on diagnostic chart.

This checks if data link or the CCDIC panel is faulty.
This checks where problem exists in data link, including the CCDIC panel.
If the ALDL cover does not provide a good jumper between pin "L" and "M", an open will develop in the data line circuit. If the jumper is good, the problem is in the CCDIC.

Fig 1: Chart C-3, Schematic, CCDIC Display Reads System Problem

Fig 2: Flow Chart C-3, CCDIC Display Reads System Problem