Applicable Systems
PC200 Excavator
Symptoms
CAN bus communication between controllers lost; multiple modules may show no data on monitor panel.
Possible Causes
- CAN bus terminator resistor open circuit
- CAN wiring harness damaged (rodent/heat)
- Controller CAN port failure
Troubleshooting Steps
- Step 1: Check CAN bus resistance at service port (60 ohm)
Resistance ~60 ohm (two 120 in parallel) - Step 2: Inspect CAN harness routing for damage
No visible harness damage - Step 3: Isolate fault by disconnecting controllers one by one
Fault clears when bad module disconnected - Step 4: Repair CAN wiring or replace faulty controller
All modules communicate on CAN bus - Step 5: Clear network codes and verify data display
All module data visible on monitor
How to Reset
Clear via service monitor after CAN bus repair.
Common Replacement Parts
- CAN Bus Terminator P/N: 705-99-33100
Frequently Asked Questions
- Q: What causes CAN bus failures on excavators?
Most commonly harness damage from vibration/heat, rodent damage, or water ingress at connectors.
Source: truckmanualshub.com Komatsu PDF
Category: Heavy Equipment