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Fault Codes:Doosan DX220LC-9C E003509-31

What is Doosan DX220LC-9C Fault Code E003509-31?

Fault Code E003509-31 indicates a hydraulic pump solenoid valve circuit malfunction, specifically detecting an open circuit or abnormal voltage in the main pump control solenoid. This code is triggered when the ECM (Engine Control Module) detects that the electrical signal to the hydraulic pump's proportional solenoid valve is outside the expected range, typically due to a break in continuity or insufficient current flow.

On the DX220LC-9C, this solenoid regulates hydraulic pump displacement and directly affects machine responsiveness. When this circuit fails, the excavator may enter a protective derate mode to prevent damage to the hydraulic system. This is critical because the pump solenoid controls flow rate based on operator demand—without proper signal, the machine cannot modulate hydraulic power efficiently.

Common Symptoms

Hydraulic system derate: Reduced swing speed, slow

Fault Description:

Voltage monitoring for sensor supply within the ECU, sensor supply error 2 -(P0653)

Fault Location:

Engine system

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