Hitachi ZX210LCH-5G Fault Code 20113-2: Complete Diagnostic Guide

What is Hitachi ZX210LCH-5G Fault Code 20113-2?

Fault Code 20113-2 indicates a Low Voltage Circuit condition in the Engine Speed Sensor (Crankshaft Position Sensor) on the Hitachi ZX210LCH-5G excavator. This code is triggered when the Engine Control Module (ECM) detects abnormally low voltage readings from the speed sensor circuit, typically below 0.5 volts during engine operation.

This code is critical because the engine speed sensor provides essential real-time data to the ECM for fuel injection timing, engine speed regulation, and overall powertrain management. When voltage drops below threshold values, the ZX210LCH-5G's Isuzu engine cannot properly synchronize fuel delivery, potentially causing serious performance issues or complete engine shutdown.

Common Symptoms

When fault code 20113-2 is active, operators typically experience:

• Hard starting or complete no-start condition, especially when the engine is warm
• Intermittent engine stalling during idle or under load
• Erratic RPM fluctuations without throttle input changes
• Engine warning lamp illuminated on the instrument cluster
• Reduced engine power or derate mode activation to protect engine components

Potential Causes

The most common technical causes for this fault on used ZX210LCH-5G excavators include:

• Damaged or corroded sensor wiring harness, particularly at flex points near the engine mount where vibration causes wire fatigue
• Failed crankshaft position sensor due to heat exposure or internal coil breakdown (common after 5,000+ operating hours)
• Corroded or loose connector pins at the sensor plug or ECM connection points
• ECM voltage supply issues, including failing voltage regulator circuits within the control module
• Damaged sensor reluctor ring on the crankshaft (rare, but occurs in high-hour machines)
• Chafed wiring rubbing against the engine block or hydraulic lines—a known issue on ZX-5G series machines

How to Troubleshoot and Fix Code 20113-2

Step 1: Visual Harness Inspection Begin by thoroughly inspecting the sensor wiring harness from the crankshaft position sensor to the ECM. On used excavators, check for wire chafing at the lower engine mounting bracket and along the fuel injection pump. Look for oil contamination, cracked insulation, or green corrosion on copper strands.

Step 2: Connector and Sensor Testing Disconnect the crankshaft position sensor connector and inspect pins for corrosion or bent contacts. Using a digital multimeter, measure sensor resistance between the two signal wires (should read 190-250 ohms at room temperature per Hitachi specifications). Check for voltage supply at the harness connector with ignition on—should read approximately 5 volts.

Step 3: Circuit Voltage Testing With the sensor connected and engine cranking, backprobe the signal wire and measure AC voltage output. A healthy sensor produces 0.5-3.0 volts AC during cranking. Readings below 0.3 volts confirm a failed sensor or circuit problem.

Step 4: Repair or Replace If wiring shows damage, repair using OEM-spec shielded cable and apply proper protective loom. Replace the crankshaft position sensor if resistance or voltage tests fail. For used machines, always apply dielectric grease to connector pins during reassembly to prevent future corrosion.

Disclaimer: This guide provides general diagnostic information. Always consult the official Hitachi service manual and consider professional diagnostic assistance for complex electrical issues or if you lack proper testing equipment.