What is Doosan DX380-9C Fault Code E000658-12?

Fault Code E000658-12 indicates a "Boom Swing Priority Valve Solenoid Circuit - Current Below Normal or Shorted to Ground" condition in the Doosan DX380-9C excavator's hydraulic control system. This diagnostic trouble code (DTC) is triggered when the Electronic Control Module (ECM) detects abnormally low current flow or an electrical short to ground in the boom swing priority valve solenoid circuit.

The boom swing priority valve manages hydraulic flow distribution during combined boom and swing operations, ensuring smooth coordinated movements. This proportional solenoid receives variable voltage signals from the ECM to modulate hydraulic pressure precisely. When this circuit malfunctions, the excavator's ability to perform simultaneous boom and swing functions becomes compromised, directly impacting productivity on the jobsite. For a machine of this size class (38-ton excavator), proper hydraulic prioritization is essential for efficient cycle times and operator control.

Common Symptoms

• Sluggish or erratic boom movement when attempting combined boom and swing operations
• Hydraulic system warning lamp illuminated on the instrument cluster
• Loss of smooth coordination between boom and swing functions, causing jerky or unpredictable movements
• Reduced hydraulic response during multi-function operations, particularly under load
• ECM may log multiple related codes if the electrical fault affects adjacent circuits

Potential Causes

The most common technical causes for E000658-12 in used Doosan excavators include:

• Damaged wiring harness near the boom swing priority valve, especially at routing points where the harness flexes during swing operations or contacts frame edges
• Corroded or moisture-contaminated electrical connectors at the solenoid terminal—common in machines operating in wet or corrosive environments
• Failed boom swing priority valve solenoid due to internal coil breakdown or mechanical wear
• Chafed wires causing intermittent shorts to ground in the engine compartment harness bundle
• ECM pin corrosion or internal ECM driver circuit failure (less common but possible in high-hour machines)
• Poor ground connections at chassis ground points, creating voltage drop issues

How to Troubleshoot and Fix Code E000658-12

Step 1: Visual Inspection and Connector Check Begin by locating the boom swing priority valve solenoid on the main control valve assembly. Disconnect the electrical connector and inspect for corrosion, bent pins, moisture intrusion, or carbon tracking. On used excavators, pay special attention to connector seals—these often degrade after 5,000+ hours. Clean connectors with electrical contact cleaner and apply dielectric grease.

Step 2: Solenoid Resistance Testing Using a digital multimeter (DMM), measure solenoid coil resistance across the solenoid terminals. Typical specification for Doosan proportional solenoids ranges from 3-8 ohms (consult service manual for exact values). Readings significantly below this range indicate internal short; infinite resistance indicates open circuit. Also check for continuity between each terminal and solenoid body—there should be no continuity (infinite resistance), confirming no short to ground.

Step 3: Wiring Harness Continuity and Short Testing With connectors still disconnected, check harness continuity from the ECM connector to the valve solenoid connector. Verify less than 1 ohm resistance on each wire. Then check each circuit wire to chassis ground—readings should show infinite resistance. Focus inspection on harness routing near swing bearing area and along boom cylinder mounting points where abrasion commonly occurs on used machines.

Step 4: Power and Ground Verification Reconnect connectors and use a DMM in voltage mode to verify the ECM supplies proper voltage to the solenoid during operation (typically 12V PWM signal). Check ground circuit voltage drop—should be less than 0.2V between solenoid ground and battery negative.

Step 5: Component Replacement or ECM Diagnosis If wiring passes all tests but code persists, replace the boom swing priority valve solenoid. If the new solenoid doesn't resolve the issue, ECM driver circuit failure is likely—this requires Doosan diagnostic software (DMS) for advanced testing or ECM replacement.

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Disclaimer: This guide provides general troubleshooting information for experienced technicians. Always consult the official Doosan service manual for your specific serial number and follow proper lockout/tagout procedures. If unfamiliar with hydraulic systems or electrical diagnostics, consult a certified Doosan technician to prevent equipment damage or injury.