The P2404: Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance refers to an issue where the sense circuit for the leak detection pump in the evaporative emission system is performing outside of the expected range. This can lead to ineffective leak detection, increased emissions, and potential failure to pass emissions tests.
P2404 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P2404: Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance |
| Is it serious? | Yes, this code can lead to increased emissions and may cause the vehicle to fail an emissions test. |
| Possible causes | – Poor performance of the leak detection pump sense circuit – Faulty leak detection pump – Wiring or connector issues |
| How to diagnose? | – Test the leak detection pump sense circuit for proper performance – Inspect wiring and connectors – Replace faulty leak detection pump if necessary |
P2404 Meaning
The P2404: Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance code indicates that the sense circuit for the leak detection pump in the vehicle’s evaporative emission system is not operating within the expected performance range. The leak detection pump is responsible for pressurizing the system to identify any leaks that could allow fuel vapors to escape into the atmosphere. Poor performance in the sense circuit can prevent accurate leak detection, leading to increased emissions and potential environmental harm.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to identify any additional related codes that might provide more context to the issue. Additional codes can help pinpoint the exact cause. | OBD-II Scanner |
| Test the Leak Detection Pump Sense Circuit for Proper Performance | Use a multimeter or diagnostic tool to evaluate the performance of the leak detection pump sense circuit. Compare the readings to the manufacturer’s specifications to determine if the circuit is operating within the acceptable range. | Multimeter, Diagnostic Tool, Wiring Diagram |
| Inspect Wiring and Connectors | Visually inspect all wiring and connectors related to the leak detection pump sense circuit for signs of damage, such as fraying, corrosion, or disconnections. Ensure that all connections are secure and free from corrosion. | Multimeter, Visual Inspection Tools, Connector Cleaning Tools |
| Inspect the Leak Detection Pump | Locate the leak detection pump and perform a visual inspection for any physical damage or signs of wear. Ensure that the pump is securely mounted and free from obstructions. | Flashlight, Visual Inspection Tools |
| Test the Leak Detection Pump | Use a diagnostic tool to activate the leak detection pump and observe its operation. Ensure that the pump responds correctly and operates within the expected parameters. Replace the pump if it does not function properly despite proper circuit performance. | Diagnostic Tool, Replacement Leak Detection Pump |
| Inspect and Repair Wiring Issues | Trace the wiring from the control module to the leak detection pump, looking for any breaks, shorts, or damaged sections. Repair or replace any faulty wiring to restore proper circuit functionality. | Wiring Repair Tools, Multimeter |
| Replace Faulty Leak Detection Pump if Necessary | If the leak detection pump is determined to be faulty after testing, remove and replace it with a new or properly functioning unit. Ensure that the replacement pump is compatible with the vehicle’s emission system. | Replacement Leak Detection Pump, Basic Hand Tools |
| Clear the Code and Test Drive | After performing the necessary repairs, clear the P2404 code using an OBD-II scanner. Take the vehicle for a test drive to ensure that the issue has been resolved and the code does not reappear. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, use the OBD-II scanner again to verify that the P2404 code has been cleared. If the code returns, further diagnosis may be required to identify and fix underlying issues. | OBD-II Scanner |
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