Doosan DX215-9C Fault Code E000105-03 (P0113): Complete Diagnostic Guide

What is Doosan DX215-9C Fault Code E000105-03 (P0113)?

Fault Code E000105-03 (P0113) indicates an Intake Air Temperature (IAT) Sensor Circuit High Input condition on the Doosan DX215-9C excavator. This code triggers when the Engine Control Module (ECM) detects an abnormally high voltage signal (typically above 4.5V) from the IAT sensor circuit, suggesting the sensor is reading unrealistically cold air temperatures (often below -40°C).

The IAT sensor plays a critical role in the DX215-9C's Doosan DL08 diesel engine management system. It monitors incoming air temperature to optimize fuel injection timing, air-fuel ratios, and turbocharger boost control. When this sensor circuit fails, the ECM cannot properly compensate for ambient conditions, leading to poor combustion efficiency and potential engine protection modes.

For used excavators, this code is particularly concerning because it directly affects fuel economy, power output, and can trigger engine derate conditions that limit machine productivity.

Common Symptoms

When Code E000105-03 is active, operators typically experience:

• Check Engine Light (CEL) illuminated on the instrument cluster with possible fault code display
• Reduced engine power or noticeable performance loss, especially during cold starts
• Hard starting conditions in various ambient temperatures
• Black smoke from exhaust due to improper fuel mixture calculations
• Increased fuel consumption as the ECM defaults to failsafe fuel mapping

Potential Causes

The most common technical causes for this fault code on used DX215-9C excavators include:

• Open circuit in the IAT sensor wiring harness (broken wire between sensor and ECM)
• Failed IAT sensor with internal circuit failure causing high resistance reading
• Damaged or corroded connectors at the sensor or ECM connection points (common in used machines exposed to moisture)
• Wiring harness chafing near the air intake manifold where harness routing contacts metal edges
• ECM internal circuit failure (rare, but possible in high-hour machines)
• Poor ground connection affecting sensor reference voltage
• Previous repair attempts with incorrect sensor specifications or aftermarket parts

How to Troubleshoot and Fix Code E000105-03 (P0113)

Step 1: Visual Inspection and Connector Check

Begin by locating the IAT sensor on the intake air ducting between the air filter and turbocharger inlet. Disconnect the sensor connector and inspect for:

• Corrosion, moisture, or oil contamination on pins
• Bent or pushed-back terminals inside connector housing
• Cracked connector bodies allowing water intrusion

Clean connectors with electrical contact cleaner and ensure pins make solid contact. On used excavators, this simple fix resolves approximately 30% of IAT high-input codes.

Step 2: Sensor Resistance Testing

Using a digital multimeter (DMM), measure the resistance across the IAT sensor terminals with the sensor disconnected:

• At 20°C (68°F), resistance should read approximately 2,000-3,000 ohms
• At 80°C (176°F), resistance should drop to approximately 300-400 ohms

If readings show infinite resistance (open circuit) or values outside specifications, replace the sensor with a genuine Doosan part (Part Number: 2872A-9018A or equivalent).

Step 3: Wiring Harness Continuity and Voltage Tests

With the sensor disconnected, check the harness:

• Measure 5V reference voltage at the harness connector (signal wire to ground)
• Test continuity from sensor connector to ECM pins (should show less than 5 ohms resistance)
• Check for short to voltage by measuring signal wire to battery positive (should show infinite resistance)

Pay special attention to harness routing near the air intake manifold mounting brackets where insulation commonly wears through on used machines. Repair any damaged wiring with heat-shrink solder connections and re-route away from friction points.

Step 4: Ground Circuit Verification

Poor grounds are frequently overlooked on older excavators. Verify:

• Sensor ground wire continuity to ECM ground (less than 1 ohm)
• Engine block ground straps are clean, tight, and corrosion-free
• ECM chassis ground connection shows proper continuity

Clean all ground connections with a wire brush and apply dielectric grease to prevent future corrosion.

Step 5: ECM Data Monitoring

If available, connect Doosan G-SCAN diagnostic software or equivalent tool to monitor live data:

• Observe IAT sensor voltage reading (should be 0.5-4.5V depending on temperature)
• Compare readings with actual ambient temperature using an infrared thermometer
• If voltage remains at 5V regardless of temperature, confirm ECM wiring or consider ECM fault

Step 6: Final Verification

After repairs, clear fault codes and perform:

• Key cycle test (turn ignition on/off three times without starting)
• Cold start test to verify proper sensor response
• Load test by operating machine under normal conditions for 30+ minutes

Monitor for code recurrence, which may indicate intermittent wiring faults common in high-vibration environments.

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Disclaimer: This guide provides general diagnostic procedures for the Doosan DX215-9C fault code E000105-03. Always consult the official Doosan service manual for your specific machine serial number and software version. For used excavators with complex electrical issues or if you lack proper diagnostic tools, consult a certified Doosan technician or qualified heavy equipment mechanic to prevent misdiagnosis and unnecessary parts replacement.