APU IO Lost Config
electrical
Description
The APU module has lost configuration 10 times from an invalid checksum, and the APU shuts down and reboots while the display stays powered.
Activation Conditions
APU Module has lost configuration 10 times (determined by invalid APU_IO checksum). System Response APU will shut down and reboot will occur. Display will remain powered.
Unit Behavior
See manual.
Reset Conditions
See manual.
Corrective Actions
1. Inspect APU Module indicator LED. ü Is light solid red – go to step 7 ü Is light OFF – Power cycle unit from AI if light remains OFF Go to step 2. ü If light is blinking green verify if alarm is still active. If alarm is active inspect harness between APU J1 and CCU J10 2. Inspect alternator, bus bar, and engine B+ and ground connections 3. Inspect APU harness and connector at APU J1 4. Check for 12VDC between APU J1:4 and APU J1:5 5. Check F2 fuse 6. Inspect APU harness and connectors between APU J1 and CCU J10 7. Replace APU Module