What is Komatsu PC200LC-7 Fault Code E116?

Fault Code E116 on the Komatsu PC200LC-7 indicates a malfunction in the pump control solenoid valve circuit within the hydraulic system. This diagnostic trouble code (DTC) is triggered when the Electronic Control Module (ECM) detects an abnormal voltage or resistance reading from the pump control solenoid valve, which regulates hydraulic pump output based on operator demand and load conditions.

The pump control system is critical for this excavator model's performance because it directly manages fuel efficiency and hydraulic responsiveness. When E116 activates, the ECM may default to a reduced power mode to prevent potential damage to the hydraulic pump or related components. For used PC200LC-7 models, this fault often stems from age-related electrical degradation rather than mechanical pump failure, making proper diagnosis essential before investing in costly replacements.

Common Symptoms

• Hydraulic system derate: Noticeably slower arm, boom, or bucket movements with reduced digging force
• Warning light activation: Engine or hydraulic warning lamp illuminated on the instrument cluster
• Intermittent power loss: Hydraulic functions may work normally when cold but fail as operating temperature increases
• Error code display: E116 displayed on the monitor panel (if equipped with Komatsu KOMTRAX or diagnostic interface)
• Inconsistent pump response: Erratic hydraulic flow causing jerky or unpredictable attachment movements

Potential Causes

The most common technical causes for Code E116 on used PC200LC-7 excavators include:

• Faulty pump control solenoid valve: Internal coil failure or mechanical sticking due to contaminated hydraulic oil or wear
• Damaged wiring harness: Chafing or rubbing at known wear points near the pump mounting area or along the main chassis harness
• Corroded electrical connectors: Moisture intrusion in the solenoid connector pins (common in machines with 5,000+ operating hours)
• Open or short circuit: Broken wires within the harness between the ECM and solenoid valve
• ECM-related issues: Less common, but ground faults or internal ECM failures can trigger false E116 codes

How to Troubleshoot and Fix Code E116

Step 1: Initial Visual Inspection Begin by inspecting the pump control solenoid valve and its electrical connector located on the main hydraulic pump assembly. Look for physical damage, oil contamination on connectors, or obvious wire damage. Check for corrosion on connector pins—clean with electrical contact cleaner if present.

Step 2: Electrical Testing Using a digital multimeter, disconnect the solenoid connector and measure resistance across the solenoid coil terminals. Typical specifications are 10-15 ohms (consult your service manual for exact values). Next, check for voltage supply from the ECM with the ignition on—you should see approximately 12 volts. If voltage is absent, trace the harness back toward the ECM checking for breaks or shorts to ground.

Step 3: Harness and Ground Verification For used excavators, thoroughly inspect the wiring harness for wear points where it contacts the frame or pump housing. Pay special attention to areas with cable ties or protective loom that may hide internal wire damage. Verify ground connections at both the solenoid and ECM are clean and tight.

Step 4: Component Replacement and Verification If testing confirms a faulty solenoid valve (out-of-spec resistance or mechanical failure), replace it with a genuine Komatsu part or OEM-equivalent. After installation, clear the fault code using Komatsu diagnostic software or by disconnecting the battery for 5 minutes. Test operate the machine through full hydraulic functions to verify repair.

Disclaimer: This guide provides general troubleshooting information. Always consult the official Komatsu service manual for your specific serial number and consider professional diagnostic services for complex electrical issues or when warranty considerations apply.