EPC System Fault - Electronic Pump Control

Komatsu Heavy Equipment Warning Hydraulic

Model: Komatsu PC200 Excavator | Code: E02

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

  1. Step 1: Read active codes from machine monitor panel
    E02 displayed as active fault
  2. Step 2: Check EPC solenoid valve resistance (10-20 ohm)
    Resistance within range
  3. Step 3: Inspect EPC valve wiring harness for damage
    Harness intact, no chafing
  4. Step 4: Test EPC valve operation with service monitor
    Valve responds to command signal
  5. 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.

Related Komatsu Fault Codes

Source: komatsufaultcodes.com + truckmanualshub.com PDF

Category: Heavy Equipment