Applicable Systems
PC200 Excavator
Symptoms
Hydraulic pump control system malfunction; reduced pump output; machine response sluggish.
Possible Causes
- EPC solenoid valve internal fault
- Pump controller (PC-ECM) communication error
- EPC proportional valve wiring damage
Troubleshooting Steps
- Step 1: Read active codes from machine monitor panel
E02 displayed as active fault - Step 2: Check EPC solenoid valve resistance (10-20 ohm)
Resistance within range - Step 3: Inspect EPC valve wiring harness for damage
Harness intact, no chafing - Step 4: Test EPC valve operation with service monitor
Valve responds to command signal - Step 5: Replace EPC valve if no response to command
New valve responds correctly
How to Reset
Clear codes via service monitor after repair and key cycle.
Common Replacement Parts
- EPC Solenoid Valve P/N: 705-99-57110
Frequently Asked Questions
- Q: What does EPC control?
Electronic Pump Control regulates hydraulic pump flow and pressure electronically for optimal efficiency.
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Source: komatsufaultcodes.com + truckmanualshub.com PDF
Category: Heavy Equipment
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