How to Fix Kobelco 8 Series I113 Alarm | Full Troubleshooting
Overview
I113 fault code is a common electrical fault on Kobelco 8-series excavators. This fault appears in two different situations, requiring different inspection methods:
I113 + Engine cannot start → Check Fuse 5 + Injector wiring short
I113 + Machine works normally → Check CPU-ECU communication + CNT-1 plug
Image: Kobelco I113 fault code displayed on monitor
Situation 1: I113 Alarm + Engine Cannot Start
Cause: Fuse 5 blown / Injector wiring short / ECU error
Open the fuse box and check fuse No.5
If fuse 5 is blown, do NOT replace directly — check for short circuit first
Measure voltage of injector wiring from ECU
If voltage exceeds 14V → wiring short or ECU damaged
Repair damaged wiring or replace faulty ECU
Never replace a blown fuse without checking the short circuit. It will burn the ECU immediately.
Image: Kobelco fuse box — Location of Fuse 5
Situation 2: I113 Alarm + Machine Works Normally
Cause: CPU–ECU communication error / CNT‑1 plug loose
I113 appears but engine starts and runs normally
Root cause: communication error between CPU and ECU
Find the CNT-1 plug inside the cab
Check if plug is loose, corroded, or wiring damaged
Replug, clean pins or repair wiring — I113 will disappear
Image: CNT-1 plug location for CPU-ECU communication
Final Conclusion
I113 + NO START → Check Fuse 5 + injector wiring short
I113 + NORMAL WORK → Check CNT-1 plug communication
Always check short circuit before replacing fuse
