What is Doosan Excavator Fault Code E000167-01?

Fault Code E000167-01 indicates a Hydraulic Pump Solenoid Control Circuit malfunction in Doosan excavators. This code is triggered when the Electronic Control Module (ECM) detects an abnormal voltage or current signal from the main hydraulic pump's proportional solenoid valve circuit.

Specifically, this fault relates to the pump flow control system that regulates hydraulic output based on operator demand and load conditions. The ECM continuously monitors the solenoid circuit for proper resistance and voltage response. When values fall outside the manufacturer's specified range (typically 0.5-4.5V for signal circuits), the system logs E000167-01 and may limit machine performance to prevent damage. This code is critical because the pump solenoid directly controls hydraulic flow efficiency, fuel consumption, and overall machine responsiveness—core functions that deteriorate rapidly in used equipment if left unaddressed.

Common Symptoms

• Reduced hydraulic power across all functions, with noticeably slower boom, arm, or bucket movements
• Erratic pump response where hydraulic power surges or drops unexpectedly during operation
• Warning light activation on the instrument cluster, often accompanied by an audible alarm
• Machine entering derate mode, limiting engine RPM to approximately 1500-1800 to protect the hydraulic system
• Increased fuel consumption due to the ECM defaulting to non-optimized pump settings

Potential Causes

The most common technical failures triggering E000167-01 in used Doosan excavators include:

• Solenoid coil failure due to internal short circuits or open windings (resistance should measure 10-30Ω depending on model)
• Wiring harness damage at known rub points near the pump mounting bracket or along the main boom pivot area
• Connector corrosion at the pump solenoid connector (typically a 3-pin Deutsch-style connector exposed to hydraulic oil mist)
• ECM power supply issues, including poor ground connections at the chassis grounding points
• Internal solenoid valve contamination from degraded hydraulic oil or metal debris in older machines

How to Troubleshoot and Fix Code E000167-01

Step 1: Visual Inspection Begin by inspecting the hydraulic pump solenoid connector for oil contamination, pin corrosion, or loose terminals. On used excavators, this connector frequently suffers from hydraulic oil seepage. Clean contacts with electrical cleaner and check for bent pins.

Step 2: Electrical Testing Using a digital multimeter, disconnect the solenoid connector and measure coil resistance across the solenoid terminals. Compare readings against specifications (consult service manual—typically 12-28Ω). Then check for supply voltage at the harness side with ignition on; you should see battery voltage (12-14V). Test the signal wire for proper voltage range during system operation using Doosan diagnostic software.

Step 3: Harness Continuity Check Trace the wiring harness from the pump to the ECM, focusing on wear points where cables contact the frame or hydraulic lines. In used machines, insulation breakdown at pivot points is extremely common. Check for shorts to ground and opens using continuity mode.

Step 4: Component Replacement If electrical tests confirm solenoid failure, replace the proportional solenoid valve assembly. For used equipment, always replace the mating connector and 6-8 inches of harness to eliminate corrosion issues. After replacement, clear codes using diagnostic software and perform hydraulic calibration procedures.

Critical for Used Equipment: Before replacing expensive components, thoroughly inspect all ground connections at the battery, frame, and ECM. Poor grounds account for 30-40% of electrical faults in aged excavators.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Doosan service manual for your specific model and serial number. If you lack proper diagnostic tools or experience with high-voltage systems, consult a certified heavy equipment technician to avoid injury or further machine damage.