What is Hitachi ZH200-5A Fault Code 10013-2?

Fault Code 10013-2 on the Hitachi ZH200-5A excavator indicates a hydraulic pump pressure sensor circuit malfunction, specifically a low voltage condition detected by the machine's Electronic Control Module (ECM). This diagnostic trouble code (DTC) signals that the pressure sensor monitoring the main hydraulic pump output is sending a voltage signal below the manufacturer's specified threshold, typically below 0.5 volts.

This code directly affects the excavator's ability to properly manage hydraulic system performance and engine load control. The ZH200-5A uses this pressure feedback to optimize fuel consumption, prevent pump overload, and maintain efficient digging force. When the ECM cannot accurately read hydraulic pressure, it may impose power derating or erratic hydraulic response to protect the machine from potential damage.

Common Symptoms

When Code 10013-2 is active on your Hitachi ZH200-5A, operators typically experience:

• Warning light illuminated on the instrument cluster, often accompanied by a diagnostic message
• Reduced hydraulic power or inconsistent boom/arm/bucket response during operation
• Engine derating or failure to reach full RPM under load
• Erratic swing speed or loss of simultaneous multi-function capability
• Intermittent fault activation that may clear and return during temperature changes

Potential Causes

The most common technical failures triggering this code on used ZH200-5A excavators include:

• Failed hydraulic pressure sensor due to internal component degradation or diaphragm rupture (common after 5,000+ hours)
• Damaged wiring harness between the sensor and ECM, particularly near the main pump mounting area where vibration causes wire chafing
• Corroded or loose connector pins at the sensor plug, especially on machines operated in wet or marine environments
• ECM voltage supply issues providing inadequate reference voltage to the sensor circuit
• Shorted sensor ground wire creating a direct path to chassis ground before reaching the ECM
• Contamination or hydraulic oil ingress into the sensor connector causing resistance changes

How to Troubleshoot and Fix Code 10013-2

Step 1: Visual Inspection and Connector Check Begin by locating the main hydraulic pump pressure sensor mounted on the pump housing. Disconnect the electrical connector and inspect for corrosion, oil contamination, bent pins, or moisture. On used excavators, this connector often shows green corrosion—clean with electrical contact cleaner and dielectric grease.

Step 2: Sensor Circuit Testing Using a digital multimeter, perform a voltage check. With the ignition ON (engine off), backprobe the sensor connector at the ECM side. You should read approximately 5.0 volts reference voltage on the signal wire. Check for continuity to ground on the ground circuit (should read less than 1 ohm resistance). If reference voltage is absent, trace wiring back to the ECM for breaks or shorts.

Step 3: Sensor Resistance and Replacement Disconnect the sensor completely and measure resistance across sensor terminals per Hitachi specifications (typically 200-450 ohms at room temperature). If readings fall outside this range or show infinite resistance, replace the pressure sensor. Before reinstalling, inspect the sensor mounting boss for metal debris or old thread sealant that could cause improper seating.

Step 4: Harness Inspection for Used Equipment Trace the sensor harness along its entire route, paying special attention to areas where the harness contacts metal edges, brackets, or passes near the swing bearing. Look for wire insulation wear, chafing, or historical repair attempts using tape. Replace damaged sections with proper gauge wire and protect with split loom.

Step 5: Clear Code and Verify Repair After repairs, use Hitachi diagnostic software (Dr.EX) or an aftermarket scan tool to clear the fault code. Operate the machine through a full work cycle monitoring live hydraulic pressure data to confirm the sensor reads between 150-400 bar during normal operation.

---

Disclaimer: This guide provides general troubleshooting information for educational purposes. Hydraulic systems operate under extreme pressure and require proper safety procedures. Always consult the official Hitachi ZH200-5A service manual and consider professional diagnostic assistance for complex electrical issues or if you lack experience with high-pressure hydraulic systems.