Description: Lower Tray Communication Failure, Code 88
Causes: • Engine Control Interface Board • Tray module board • Engine Control board
Remedy: 1 Is J668-1 on the tray module board +5 VDC? Go to step 2. Use the wirenets to troubleshoot and repair the open wire. 2 Is J668-3 on the tray module board +24 VDC? Go to step 3. Use the wirenets to troubleshoot and repair the open wire. 3 1. Check the following connectors for continuity: • P669-1 to J534A-15 • P669-2 to J534A-14 • P669-3 to J534A-13 • P669-4 to J534A-12 • P669-5 to J534A-11 • P669-6 to J534A-10 2. Do all checks indicate continuity? Replace in the following order: • engine control interface board • tray module board • engine control board Check and repair broken wires or bad connectors.