Doosan DX380-9C Fault Code E000657-13: Complete Diagnostic Guide

What is Doosan DX380-9C Fault Code E000657-13?

Fault Code E000657-13 indicates a "High Pressure Sensor Circuit - Open or Short to Ground" condition in the hydraulic system of the Doosan DX380-9C excavator. This code specifically relates to the main hydraulic pump pressure sensor circuit, which monitors system pressure to optimize pump output and protect critical hydraulic components from over-pressure conditions.

This code is critical because the Electronic Control Unit (ECM) relies on accurate pressure readings to manage pump displacement, fuel efficiency, and prevent catastrophic hydraulic system damage. When this sensor circuit fails, the machine may enter a derate mode or experience reduced hydraulic performance, directly impacting productivity on job sites.

Common Symptoms

When Code E000657-13 is active, operators typically experience:

• Warning light illuminated on the instrument cluster with fault code displayed on the monitor panel
• Reduced hydraulic power across all functions, particularly noticeable during boom, arm, and bucket operations
• Sluggish machine response when attempting simultaneous multi-function operations
• Intermittent loss of hydraulic power that may come and go with machine vibration or temperature changes
• Engine derating in severe cases, limiting RPM to protect the hydraulic system

Potential Causes

The most common technical causes for this fault code on used DX380-9C excavators include:

• Damaged or corroded wiring harness at known rub points near the main hydraulic pump mounting area
• Failed high-pressure sensor due to internal component degradation or contamination exposure
• Connector pin corrosion at the sensor plug, especially on machines operating in wet or coastal environments
• Broken or frayed wires in the engine compartment harness from prolonged vibration and heat cycling
• ECM ground circuit issues affecting multiple sensor readings simultaneously
• Contaminated hydraulic oil causing sensor membrane failure or internal short circuits

How to Troubleshoot and Fix Code E000657-13

Step 1: Visual Inspection Begin by locating the main hydraulic pump pressure sensor on the pump body. Inspect the wiring harness from sensor to ECM, paying particular attention to areas where the harness contacts frame members or passes near hot exhaust components. On used excavators, check for wire insulation wear, connector corrosion, and oil contamination that can cause intermittent failures.

Step 2: Electrical Testing Disconnect the pressure sensor connector and use a digital multimeter to check circuit resistance. With the ignition off, measure resistance between the signal wire and ground—you should read infinite resistance (open circuit). Check for continuity between sensor ground and chassis ground (should be less than 5 ohms). Inspect connector pins for bent terminals or green corrosion buildup.

Step 3: Sensor Testing Test the sensor itself by measuring its supply voltage (should be 5V ±0.25V with key on, engine off). Check sensor output signal voltage at idle pressure—typically 0.5-1.5V depending on system pressure. Compare readings against Doosan specifications using DX Diag software or authorized diagnostic tools.

Step 4: Harness Repair or Replacement If testing reveals open circuits or intermittent shorts, repair damaged harness sections using proper gauge wire and weatherproof connectors. For used machines with extensive harness damage, consider replacing the entire pump-to-ECM harness section to prevent recurring failures.

Step 5: Component Replacement If the sensor tests faulty, replace it with a genuine Doosan pressure sensor and ensure proper torque specifications (typically 15-20 Nm). After replacement, clear codes using diagnostic software and perform a hydraulic system pressure test to verify proper operation across all RPM ranges.

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