What is XCMG XE490D 3.3 CM2250 Fault Code 2373?

Fault Code 2373 indicates an Intake Manifold 1 Pressure - Data Valid But Above Normal Operating Range issue in the Cummins CM2250 engine used in XCMG XE490D excavators. This code triggers when the Engine Control Module (ECM) detects that the intake manifold pressure sensor is reading values consistently higher than the predetermined threshold for normal operating conditions.

The Intake Manifold Pressure (IMP) sensor is critical for monitoring boost pressure and calculating proper fuel injection timing and quantity. In the CM2250 engine, this sensor directly affects turbocharger management, emissions control, and overall engine performance. When readings exceed normal parameters, the ECM may initiate engine derate to prevent catastrophic damage from over-boost conditions or incorrect air-fuel ratios.

Common Symptoms

• Check Engine Light (CEL) illuminates on the instrument cluster with possible amber warning indicator
• Engine power derate or reduced hydraulic performance, particularly noticeable during high-load operations like digging or lifting
• Black smoke from the exhaust due to rich fuel mixture from incorrect manifold pressure readings
• Rough idle or inconsistent engine RPM, especially during warm-up cycles
• Turbocharger overspool or unusual whistling sounds indicating potential boost control issues

Potential Causes

The most common technical reasons for Code 2373 in used XCMG excavators include:

• Failed or degraded Intake Manifold Pressure sensor due to heat cycling and vibration exposure over time
• Restricted or collapsed intake ducting between the air filter and turbocharger inlet, creating false high-pressure readings
• Turbocharger wastegate actuator failure causing uncontrolled boost pressure
• Wiring harness damage at the sensor connector, particularly where the harness routes near the engine block (common rub point on CM2250 installations)
• Clogged intercooler or excessive oil accumulation in the intake system from worn turbo seals
• ECM calibration issues or corrupted sensor data tables in older machines with outdated software

How to Troubleshoot and Fix Code 2373

Step 1: Visual Inspection Begin by inspecting the IMP sensor located on the intake manifold near the throttle valve assembly. Check for oil contamination, damaged connector pins, or corrosion on terminals. On used excavators, examine the wiring harness for chafing where it contacts engine brackets or heat shields—a notorious failure point on XCMG machines operating in harsh environments.

Step 2: Sensor Testing Using a digital multimeter, verify the sensor's 5-volt reference supply from the ECM and check ground circuit continuity. The IMP sensor should show approximately 0.5-4.5 volts depending on manifold pressure. Compare live data using Cummins INSITE diagnostic software against known good values (typically 14.7 psi at sea level, idle conditions). Test the sensor under load conditions to identify intermittent failures.

Step 3: System Pressure Verification Install a calibrated mechanical boost gauge temporarily to verify actual manifold pressure versus sensor readings. If mechanical readings are normal but the sensor reports high, replace the IMP sensor (Cummins part 4921744 or equivalent). If mechanical pressure is genuinely high, inspect the turbocharger wastegate actuator, check for intake restrictions, and examine the variable geometry turbo (VGT) actuator for binding or carbon buildup.

Step 4: Harness and ECM Evaluation For persistent codes after sensor replacement, perform a wiggle test on all connectors while monitoring live data. Check ECM connector C1 pins for bent terminals or moisture intrusion. Verify ECM software is current using INSITE—Cummins released calibration updates addressing false high-pressure readings on CM2250 engines manufactured between 2011-2014.

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Disclaimer: This guide provides general diagnostic information. Always consult the official XCMG service manual and Cummins troubleshooting procedures for your specific machine serial number. If unfamiliar with high-pressure fuel systems or electronic diagnostics, seek assistance from a certified Cummins technician to avoid injury or further equipment damage.