Doosan DX150LC-9C Fault Code E000108-04: Complete Diagnostic Guide

What is Doosan DX150LC-9C Fault Code E000108-04?

Fault Code E000108-04 indicates a hydraulic system pressure sensor circuit malfunction, specifically related to the main pump delivery pressure monitoring system in the Doosan DX150LC-9C excavator. This code triggers when the Electronic Control Unit (ECU) detects an abnormal voltage signal from the main hydraulic pressure sensor, typically indicating either sensor failure, wiring issues, or actual hydraulic system anomalies.

This code is critical for the DX150LC-9C because the machine's Smart Power Control (SPC) system relies on accurate pressure feedback to optimize engine load, fuel efficiency, and hydraulic response. When this sensor circuit fails, the excavator may enter a protective derate mode or experience erratic hydraulic performance, directly impacting productivity and potentially causing secondary system damage if left unaddressed.

Common Symptoms

When Code E000108-04 is active, operators typically experience:

• Dashboard warning light illuminated with fault code display on the monitor panel
• Reduced hydraulic power or sluggish boom/arm/bucket response, especially under load
• Engine RPM fluctuations during hydraulic operations due to improper load sensing
• Intermittent loss of auxiliary hydraulic functions or flow control issues
• Automatic engine derating to protect the powertrain from potential overload conditions

Potential Causes

The most common technical reasons for E000108-04 appearing on used DX150LC-9C excavators include:

• Failed hydraulic pressure sensor (common wear item after 5,000+ operating hours)
• Corroded or damaged wiring harness connectors near the main control valve area where vibration and hydraulic oil mist cause deterioration
• Chafed sensor wiring at known rub points along the boom cylinder routing path
• Contaminated hydraulic oil affecting sensor accuracy or causing internal sensor diaphragm damage
• ECU internal fault or corrupted calibration data (less common but possible in older machines)
• Poor ground connections at the sensor mounting point or ECU chassis ground

How to Troubleshoot and Fix Code E000108-04

Step 1: Visual Inspection Begin by locating the main hydraulic pressure sensor on the control valve manifold (typically mounted near the pump outlet). Inspect the sensor body for physical damage, oil leaks, or loose mounting. Examine the wiring harness from sensor to ECU, checking for abraded insulation, corroded connectors, or evidence of previous repairs. On used excavators, pay special attention to harness routing near moving components.

Step 2: Electrical Testing Using a digital multimeter, disconnect the pressure sensor connector and measure resistance across the sensor terminals (typical specification: 250-350 ohms at 20°C, but verify with Doosan service manual). Check supply voltage at the harness connector with ignition on (should read 5V ±0.25V). Test for continuity between sensor ground and chassis ground (should be less than 1 ohm).

Step 3: Signal Verification Connect Doosan G-Scan diagnostic software to verify real-time sensor voltage output. At zero hydraulic pressure (engine off), the sensor should output approximately 0.5V. Compare readings with actual hydraulic pressure using a mechanical test gauge installed at the sensor port. If voltage doesn't correlate with pressure, replace the sensor.

Step 4: Harness and ECU Testing If the sensor tests correctly, inspect the ECU connector pins for corrosion or backing-out. Perform a wiggle test on all connectors while monitoring live data to identify intermittent connections. For used machines, consider cleaning all connector contacts with electrical contact cleaner before replacing components.

Disclaimer: This guide provides general diagnostic procedures. Always consult the official Doosan service manual for your specific serial number and software version. If you're uncomfortable performing electrical diagnostics or working with pressurized hydraulic systems, contact a certified Doosan technician or qualified heavy equipment mechanic.