What is John Deere E240LC Fault Code 001110.31?

Fault Code 001110.31 indicates a voltage condition below normal or shorted to ground on the EGR (Exhaust Gas Recirculation) differential pressure sensor circuit. This diagnostic trouble code (DTC) is triggered when the Engine Control Module (ECM) detects abnormally low voltage readings from the EGR differential pressure sensor, which monitors pressure differences across the EGR cooler to ensure proper exhaust gas recirculation flow.

This code is critical for the John Deere E240LC because the EGR system plays a vital role in meeting Tier 4 emissions standards while maintaining optimal engine performance. When this sensor circuit fails, the ECM cannot accurately regulate exhaust gas flow, potentially leading to increased emissions, reduced fuel efficiency, and engine protection modes that limit machine productivity.

Common Symptoms

• Check Engine light or amber warning indicator illuminated on the instrument cluster
• Engine derate or power reduction mode, limiting machine performance to protect the emissions system
• Rough idling or inconsistent engine performance, particularly under load conditions
• Increased black smoke from the exhaust due to improper EGR function
• Stored fault codes in the ECM memory that may trigger limp mode if not addressed

Potential Causes

The most common technical causes for Code 001110.31 on used John Deere E240LC excavators include:

• Damaged wiring harness or chafed wires along the engine compartment, especially near heat sources or moving components where insulation deteriorates over time
• Corroded or loose electrical connectors at the EGR differential pressure sensor, common in machines exposed to harsh environments
• Failed EGR differential pressure sensor due to carbon buildup, internal electrical failure, or sensor diaphragm damage
• Short circuit to ground in the sensor signal wire caused by harness routing issues or pinched cables
• ECM internal fault (less common) affecting the sensor's reference voltage supply circuit

How to Troubleshoot and Fix Code 001110.31

Step 1: Visual Inspection Begin by locating the EGR differential pressure sensor on the engine block near the EGR cooler assembly. Inspect the wiring harness for obvious damage, including chafing, melted insulation, or corrosion at connection points. On used excavators, pay special attention to harness routing near the turbocharger and exhaust components where heat damage commonly occurs.

Step 2: Electrical Testing Using a digital multimeter, disconnect the sensor connector and check for continuity to ground on the signal wire with the key off. You should read infinite resistance (open circuit). Next, measure the reference voltage from the ECM at the connector—typically 5 volts. If voltage is absent or significantly low, trace the harness back to the ECM for breaks or shorts.

Step 3: Sensor and Component Testing Test the EGR differential pressure sensor resistance according to John Deere specifications (consult Service Advisor™ software for exact values). Clean all electrical connectors with electrical contact cleaner and apply dielectric grease to prevent future corrosion. If the sensor tests faulty or wiring shows damage, replace the affected components and clear codes using John Deere Service Advisor or compatible diagnostic software.

Step 4: Verification After repairs, perform a regeneration cycle if required and road test the machine under normal operating conditions to ensure the fault does not return.

Disclaimer: This guide provides general troubleshooting information. Always consult the official John Deere service manual for your specific machine serial number and consider professional diagnostic assistance for complex electrical issues or if you're unfamiliar with high-voltage systems.