What is Komatsu PC110-8M0 Fault Code E-14?

Fault Code E-14 on the Komatsu PC110-8M0 indicates a Travel Motor Solenoid Valve Circuit Malfunction, specifically related to an open circuit or short circuit in the electrical system controlling the hydraulic travel motor solenoid. This code is triggered when the machine's Electronic Control Module (ECM) detects abnormal voltage or resistance readings outside the manufacturer's specified range (typically 10-30 ohms for solenoid coils).

This fault directly impacts the excavator's ability to control travel speed and direction through the hydraulic system. The travel motor solenoid valves regulate hydraulic flow to the propel motors, and any electrical disruption can compromise machine mobility. On the PC110-8M0, this system is particularly sensitive because it interfaces with the machine's load-sensing hydraulic circuit, meaning even intermittent electrical faults can cause erratic travel behavior or complete immobilization.

Common Symptoms

When Code E-14 is active, operators typically experience:

• Warning light illumination on the dashboard with simultaneous fault code display on the monitor panel
• Loss of travel function in one or both directions, or complete inability to move the machine
• Intermittent jerking or hesitation during travel operations, especially when changing direction
• Automatic derate mode where the engine limits RPM to protect the hydraulic system from damage
• Audible clicking from the solenoid valve area without corresponding hydraulic response

Potential Causes

The most common technical causes for E-14 on used PC110-8M0 excavators include:

• Damaged wiring harness along the undercarriage where cables contact the rotating track frame (known rub point on this model series)
• Corroded or loose connector pins at the solenoid valve plug, particularly due to water intrusion through worn grommets
• Failed travel motor solenoid coil due to age-related insulation breakdown (common after 8,000+ operating hours)
• Shorted or open circuit in the cab-mounted travel control lever harness from repeated flexing
• ECM internal circuit fault (less common but documented in 2014-2016 production units)
• Voltage supply issues from corroded main power distribution connections in the junction box under the operator's seat

How to Troubleshoot and Fix Code E-14

Step 1: Visual Inspection and Connector Check

Begin by inspecting the solenoid valve connector located on the travel motor assembly. Disconnect the harness and examine pins for corrosion, bent contacts, or moisture. On used excavators, this connector frequently accumulates dirt and water. Clean with electrical contact cleaner and check the rubber seal condition. Measure continuity through the harness using a multimeter – you should read 12-25 ohms across the solenoid coil terminals with the connector unplugged.

Step 2: Harness Pathway Examination

Trace the solenoid valve wiring harness from the motor to the main junction box. Pay special attention to the section running along the swing bearing area where the harness passes through the center joint – this is a documented wear point on PC110-8M0 models. Look for abrasion marks, exposed copper wire, or previous repair attempts. Check for proper routing away from hot exhaust components and sharp edges.

Step 3: Electrical Testing with Diagnostic Software

Connect Komatsu KOMTRAX or compatible diagnostic software to read live data from the ECM. Monitor the solenoid valve command signal while attempting travel operation. The ECM should output approximately 12-14 volts DC to the solenoid. If voltage is present but the code persists, the solenoid coil has likely failed internally. If no voltage appears, test the ECM output circuit by checking voltage at pin 37 (travel solenoid positive) on the main ECM connector with the key on and travel lever activated.

Step 4: Component Replacement and Verification

If diagnostics confirm a failed solenoid, replacement requires draining approximately 20 liters of hydraulic oil from the travel circuit. When installing the new proportional solenoid valve, torque mounting bolts to 18-22 Nm and ensure O-rings are properly lubricated. For used machinery, always replace the connector and at least 30cm of harness near the solenoid to prevent recurring failures from aged wiring insulation. After installation, clear codes, perform three complete travel cycles in both directions, then re-check for code storage.

---

Disclaimer: This guide provides general troubleshooting information for experienced technicians. Always consult the official Komatsu service manual for your specific serial number, observe proper lockout/tagout procedures, and consider professional diagnostic services for complex electrical issues. Improper repairs can result in equipment damage or safety hazards.