What is Doosan DX215-9C Fault Code E000105-05 (P1113)?

Fault Code E000105-05 (P1113) indicates an Intake Air Temperature (IAT) Sensor Circuit High Voltage condition on the Doosan DX215-9C excavator. This diagnostic trouble code triggers when the Engine Control Module (ECM) detects an abnormally high voltage signal (typically above 4.5-4.8 volts) from the IAT sensor circuit, which monitors the temperature of air entering the combustion system.

The IAT sensor is a critical component in the engine's fuel management system. It provides real-time data that allows the ECM to adjust fuel injection timing and volume based on air density. When this circuit fails high, the ECM receives false temperature readings, causing the engine management system to miscalculate the air-fuel mixture, potentially leading to reduced performance, increased emissions, and excessive fuel consumption on your DX215-9C.

Common Symptoms

• Check Engine Light or Warning Indicator illuminated on the dashboard display
• Reduced engine power or noticeable loss of hydraulic performance during operation
• Hard starting or extended cranking time, especially in cold weather conditions
• Rough idle or inconsistent engine RPM when the machine is at operating temperature
• Black smoke from the exhaust due to overly rich fuel mixture caused by incorrect air temperature compensation

Potential Causes

The P1113 code on used Doosan excavators typically stems from several age-related or environmental factors:

• Open circuit in IAT sensor wiring harness – common wear point near the intake manifold where vibration causes wire chafing
• Corroded or damaged connector pins at the IAT sensor plug, especially on machines operated in humid or coastal environments
• Failed IAT sensor with internal open circuit (less common but possible after 5,000+ operating hours)
• Damaged ECM wiring or connector issues at the engine control module itself
• Poor ground connection affecting the sensor's reference voltage circuit
• Previous repair attempts using non-OEM sensors with incorrect resistance specifications

How to Troubleshoot and Fix Code E000105-05 (P1113)

Step 1: Visual Inspection Locate the IAT sensor on the intake manifold or air intake piping. Inspect the wiring harness from sensor to ECM for visible damage, melted insulation, or rub-through points where cables contact metal surfaces. On used excavators, pay special attention to harness routing near engine mounts and hot exhaust components. Check the connector for corrosion, pushed-back pins, or moisture intrusion.

Step 2: Electrical Testing Disconnect the IAT sensor connector. Using a digital multimeter, measure the resistance across the sensor terminals. At 68°F (20°C), resistance should typically read 2,000-3,000 ohms (consult your service manual for exact specifications). If the reading shows infinite resistance (open circuit), the sensor has failed. Next, check the harness-side connector for voltage: key on, engine off should show approximately 5 volts reference voltage from the ECM.

Step 3: Circuit Continuity Check With the sensor disconnected and ignition off, test continuity between the sensor harness connector and the ECM connector pins. Check the wiring diagram in your service manual to identify correct pin locations. Any open circuit indicates damaged wiring. Also verify the ground circuit has less than 0.5 ohms resistance to chassis ground.

Step 4: Repair or Replace If the sensor tests faulty, replace it with an OEM Doosan IAT sensor or quality equivalent matching factory specifications. If wiring is damaged, repair using heat-shrink solder connections rather than crimp connectors for durability. For used excavators with high hours, consider replacing the entire sensor-to-ECM harness section if multiple wear points exist. After repairs, clear the fault code using Doosan diagnostic software (DMS-5 or equivalent) and perform a test cycle to verify proper operation.

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Disclaimer: This guide provides general troubleshooting information for the Doosan DX215-9C. Always consult the manufacturer's service manual and consider professional diagnostic assistance for complex electrical issues. Improper repairs may cause additional damage or safety hazards.