<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The primary symptom of DTC P2407 is the illumination of the engine light. This indicates an issue with the evaporative emission system, specifically the leak detection pump sense circuit. Potential causes include a faulty leak detection pump, damaged wiring, or a malfunctioning sensor.</li> <li><b>Erratic Engine Performance</b>: Intermittent or erratic signals from the leak detection pump sense circuit can lead to inconsistent engine performance. This may manifest as rough idling, hesitation during acceleration, or unexpected stalling. Potential causes include intermittent electrical connections or a failing leak detection pump.</li> <li><b>Increased Emissions</b>: A malfunction in the evaporative emission system can result in increased emissions. This is due to the system's inability to properly detect and manage fuel vapor leaks. Potential causes include a defective leak detection pump or compromised wiring.</li> </ul>

<ul><li>The leak detection pump may be faulty, causing intermittent or erratic signals.</li><li>An open or shorted harness in the leak detection pump can disrupt the circuit.</li><li>Poor electrical connections in the leak detection pump circuit can lead to erratic behavior.</li><li>A faulty purge valve can affect the overall performance of the evaporative emission system.</li><li>A clogged or damaged charcoal canister can impede the proper functioning of the system.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P2407 and check for any additional codes that may be related.</li> <li><b>Visual Inspection</b>: Inspect the EVAP system components, including hoses, connectors, and the leak detection pump for any visible damage or disconnections.</li> <li><b>Check Electrical Connections</b>: Verify that all electrical connections to the leak detection pump are secure and free of corrosion or damage.</li> <li><b>Test Leak Detection Pump</b>: Using a multimeter, measure the voltage and continuity of the leak detection pump circuit to ensure it is within manufacturer specifications.</li> <li><b>Inspect Wiring Harness</b>: Examine the wiring harness for any signs of wear, fraying, or damage that could cause intermittent or erratic signals.</li> <li><b>Check Control Module</b>: Test the EVAP system control module for proper operation and ensure it is sending the correct signals to the leak detection pump.</li> <li><b>Perform Smoke Test</b>: Conduct a smoke test to identify any leaks in the EVAP system that could be causing the intermittent/erratic signal.</li> <li><b>Clear Codes and Test Drive</b>: After repairs, clear the DTC codes and perform a test drive to ensure the issue has been resolved and the code does not return.</li></ul>

<p>The DTC code P2407 indicates an issue with the Evaporative Emission System Leak Detection Pump Sense Circuit being intermittent or erratic.</p><ul><li><b>Potential Risks:</b> This can lead to increased emissions and potential fuel vapor leaks, which may affect vehicle performance and environmental compliance.</li><li><b>Immediate Actions:</b> Inspect the wiring and connections to the leak detection pump for any signs of damage or corrosion. Ensure the pump itself is functioning correctly and replace any faulty components.</li></ul>