What is Doosan Excavator Fault Code E001613-03?

Doosan fault code E001613-03 indicates a high voltage condition detected on the Engine Coolant Temperature (ECT) sensor signal circuit, meaning the ECM has received a voltage reading above the expected operating threshold.

This code is tied to the ECT sensor, which continuously feeds coolant temperature data to the Engine Control Module (ECM). On Doosan machines, accurate coolant temperature monitoring is critical for maintaining proper fuel injection timing, cooling fan engagement, and preventing catastrophic engine overheating events.

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Common Symptoms

When E001613-03 is active on your Doosan excavator, operators typically report:

• Warning light or fault indicator illuminated on the cluster display
• Erratic or maxed-out temperature gauge readings (pegged high or showing unrealistic values)
• Engine derate mode activated, reducing power and hydraulic response
• Cooling fan running continuously at full speed as a failsafe measure
• Difficulty with cold-start performance due to incorrect temperature compensation by the ECM

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Potential Causes

Several underlying issues can trigger this high-voltage fault code:

• Open circuit in the ECT sensor signal wire — breaks the reference loop, causing voltage to spike
• Failed ECT sensor with internal short to voltage or open resistance
• Corroded or damaged connector pins at the sensor harness plug — extremely common on used machines
• Chafed or damaged wiring harness rubbing against the engine block or coolant lines
• ECM internal fault misreading the sensor circuit (less common, but possible on high-hour machines)

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How to Troubleshoot and Fix Code E001613-03

Step 1 — Visual Inspection First Begin with a thorough physical inspection of the ECT sensor harness and connector. On used excavators, check for harness chafing against hot surfaces, corroded terminals, and moisture intrusion in the connector body. Clean terminals with electrical contact cleaner before proceeding.

Step 2 — Test the ECT Sensor Resistance Disconnect the ECT sensor connector and use a digital multimeter to measure sensor resistance across its terminals. Cross-reference readings against Doosan's temperature-resistance specification chart. A typical ECT sensor should read approximately 2.0–2.5 kΩ at 25°C (77°F). Values outside range indicate a failed sensor.

Step 3 — Check Circuit Voltage With the key in the ON position (engine off), use your multimeter to verify the reference voltage at the harness connector is approximately 5V DC. A reading significantly above 5V points to a wiring short to power. Use Doosan's proprietary DIAG diagnostic software or a compatible third-party tool (such as Cummins INSITE if Cummins-powered) to monitor live sensor data and confirm fault status.

Step 4 — Inspect ECM Connections If wiring and sensor check out, inspect the ECM connector for bent pins, corrosion, or moisture. Reseat connectors firmly and clear the fault code before retesting.

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Disclaimer: This guide is intended for informational and diagnostic reference purposes only. Always consult a certified Doosan dealer or licensed heavy equipment technician before performing repairs, especially on machines under warranty or in safety-critical applications.