AdBlue defect on Doosan DX300 excavators: a frequent source of breakdowns
AdBlue failure on Doosan DX300 excavators is a frequent problem that directly affects performance and productivity on the job site. Equipped with the DL08P engine, these machines regularly experience malfunctions linked to the SCR system, resulting in reduced power, excessive AdBlue consumption and untimely stoppages.
To solve these problems permanently, the AdBlue fault codes stored in the engine ECU must be permanently removed. This eliminates power limitations and unnecessary urea consumption, guaranteeing stable, stress-free operation.
The solution is based on targeted reprogramming of the Bosch EDC17CV41 ECU used on the DL08P engine. By modifying the internal parameters linked to SCR management, optimal engine behavior is restored, with no active faults or loss of torque in the field.
AdBlue fault diagnosis on Doosan excavator (Bosch EDC17CV41)
Accurate diagnostics are essential before any work is carried out on a Doosan DX300 excavator equipped with the DL08P engine and Bosch EDC17CV41 ECU. Some faults persist even after parts have been replaced, often leading to the complete removal of the AdBlue system to avoid repeated breakdowns.
Here are the codes found in connection with the SCR system:
E520809-12 - Monitoring of SCR DeSox : The deSOx temperature was not reached
SCR does not heat up sufficiently. Temperature sensor may be faulty. Catalytic converter may lose efficiency.
E520730-12 - Inducement count "Interruption of DEF dosing" level exceeded
Urea injection stops too often. Pump or pipes may be clogged. System goes into degraded mode.
E520743-12 - Inducement count "Tampering" level exceeded
The ECU detects tampering. A sensor may have been shunted or disconnected. The system reduces power.
E004376-05 - Urea reverting valve : No load error
Urea return valve not responding. Possible electrical or mechanical problem.
E520766-03 - High side switch error of Urea dosing
The high-voltage control circuit of the injection module is faulty. Possible short-circuit or internal fault.
E004334-03 - Urea pump module pressure sensor error
The pressure sensor gives an inconsistent reading. It may be damaged or incorrectly calibrated.
E520772-05 - Urea pump motor 3 : No load error
Pump running empty. The motor may be blocked or burnt out. Injection has stopped.
E004357-12 - Supply module heater : No load error (P20C5)
Module heating does not work. Resistor switched off or circuit open. AdBlue may crystallize in cold weather.
Reprogramming process for AdBlue fault on Doosan DX300 excavator (EDC17CV41)
To permanently eliminate AdBlue-related faults on a Doosan DX300 excavator equipped with the DL08P engine, direct intervention on the Bosch EDC17CV41 ECU is required. The aim of this operation is to cleanly deactivate the SCR functions responsible for recurring error codes and power losses.
1. Initial diagnosis
Intervention begins with a complete reading of ECU faults using a Bosch-compatible tool (bench or OBD diagnostics, depending on access). Codes relating to urea injection, module heating, pump or SCR temperature are analyzed. The aim is to confirm an AdBlue system failure and avoid unnecessary component replacement.
2. Read engine file
The engine file is extracted directly from the ECU Bosch EDC17CV41 at bench modewithout opening the ECU. This operation recovers a complete image in the .binincluding engine mapping, sensor management, anti-pollution functions (SCR, EGR), as well as diagnostic and safety routines. This file forms the basis for the modifications required to deactivate the AdBlue system.
3. Analysis of anti-pollution functions
Blocks linked to SCR management are identified manually or via script: AdBlue injection, NOx sensor monitoring, pressures, temperatures, power supply, inducement logic. Addresses corresponding to active DTCs linked to the system are also located.
4. Internal data modification
Once the engine file has been extracted, AdBlue functions are deactivated directly in the Bosch EDC17CV41 ECU. Thanks to the analysis of internal blocks (maps and SCR logic), values linked to urea injection, NOx sensors, power reduction strategies and fault codes are specifically neutralized.
The maps concerned are identified using precise definitions from DAMOS/A2L files. All SCR system functions are thus deactivated cleanly, to avoid any error feedback via the CAN network or the manufacturer's diagnostic tools. This modification guarantees stable, long-term suppression of the AdBlue system on the Doosan DX300 excavator.
6. ECU rewriting and machine validation
After modifying the engine file, we reinject it directly into the Bosch EDC17CV41 ECU, in bench mode, using the same protocol as for the initial reading. Once the engine has been restarted, we run a series of tests to validate the complete deactivation of the AdBlue system.
First we check the cold start, then the hot start, to ensure that the ECU remains stable under all conditions. Next, we analyze the AdBlue-related PID parameters: they remain inactive, confirming that the SCR system is no longer functioning. We also check that there is no degraded mode, and that the ECU is no longer reducing power.
Finally, we push the machine under full load. We check that the engine is delivering its full power, without fault, and that the excavator is operating normally without urea injection. This reprogramming guarantees smooth, reliable operation, with no feedback from the emission control system.
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