What is Komatsu PC210LC-7 Fault Code E113?

Fault Code E113 on the Komatsu PC210LC-7 indicates a problem with the Engine Controller (ECM) detecting an abnormal signal from the Fuel Injection Pump's Timing Control Valve circuit. This fault specifically relates to the electronic fuel delivery system's inability to properly regulate injection timing, which is critical for optimal combustion efficiency and engine performance.

The PC210LC-7 utilizes a SAA6D107E-1 engine with electronically controlled fuel injection. The Timing Control Valve (TCV) adjusts fuel injection timing based on load conditions and engine speed. When the ECM detects voltage irregularities, open circuits, short circuits, or improper resistance values from this valve's wiring or the valve itself, it triggers E113 and may initiate protective derate modes to prevent engine damage.

This code is particularly critical because improper injection timing directly affects fuel economy, emissions compliance, power output, and can lead to catastrophic engine failure if ignored. On used excavators, this fault commonly stems from wear-related electrical issues rather than component failure.

Common Symptoms

• Engine warning lamp illuminated on the monitor panel with E113 displayed
• Reduced engine power or activation of derate mode limiting maximum RPM to protect the engine
• Rough idling or inconsistent engine performance, especially during cold starts
• Black or white exhaust smoke indicating poor combustion due to incorrect injection timing
• Increased fuel consumption and difficulty maintaining consistent operating temperatures

Potential Causes

The most frequent causes of E113 on used PC210LC-7 excavators include:

• Damaged wiring harness between the ECM and Timing Control Valve, particularly at rub points near the fuel pump mounting bracket or along the engine block where vibration causes insulation wear
• Corroded or loose electrical connectors at the TCV or ECM terminals due to moisture intrusion from damaged wire boots
• Failed Timing Control Valve solenoid with internal coil resistance outside specification (typically 2-6 ohms)
• ECM internal fault or software corruption (less common but possible on high-hour machines)
• Poor ground connections at engine harness ground points G101 or G102, which deteriorate over time

How to Troubleshoot and Fix Code E113

Step 1: Visual Inspection and Connector Check Begin by inspecting the engine wiring harness for obvious damage, particularly around areas where the harness contacts the engine or frame. Check the Timing Control Valve connector (located on the fuel injection pump assembly) for corrosion, bent pins, or moisture. Clean contacts with electrical contact cleaner and ensure the connector locks securely. On used excavators, this connector often experiences vibration-related loosening.

Step 2: Resistance and Voltage Testing Using a digital multimeter, disconnect the TCV connector and measure resistance across the valve's terminals. Specification is typically 2.0-6.0 ohms at 20°C (consult your service manual for exact values). Next, check for supply voltage at the harness side connector with the ignition on—you should see battery voltage momentarily during key-on. Check for continuity between each wire and the ECM connector pins, and verify less than 1 ohm resistance to confirm no open circuits.

Step 3: Component and Ground Verification If wiring tests pass, remove the Timing Control Valve and inspect for mechanical damage or debris. Test the valve using Komatsu diagnostic software (KOMTRAX Plus) or an aftermarket tool capable of actuating the TCV while monitoring ECM response. Verify all engine ground points are clean, tight, and free of corrosion—poor grounds are extremely common on used machines. If all tests pass but the code persists, ECM replacement or reprogramming may be necessary.

Disclaimer: This guide provides general troubleshooting information. Always consult the official Komatsu service manual for your specific machine serial number and consider professional diagnostic services for complex electrical issues or if you lack proper testing equipment.