P2404 - OBD Trouble Code

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The only important symptom to this problem is the Check Engine Light being on, which makes it very difficult for the driver to notice the problem. When your OBD-II equipped vehicle exhibits a code P2404, it means that the powertrain control module (PCM) has detected an intermittent signal from the evaporative emissions (EVAP) system leak detection pump sense circuit range/performance.

The LDP contains a solenoid and solenoid vent to calibrate pressure in the chamber containing the diaphragm. Controlled solenoid activation and deactivation is the driving force for a diaphragm pump connected to the vehicle fuel system. This is the key feature of an LDP pump. An intake pipe connects leak detection pump to the vehicle vacuum line. There are two prominent lines from the LDP to the canister and filter. The canister manifold leads to the EVAP and the filter line leads to the LDP filter, which is usually attached nearby. The EVAP canister collects and purges fuel gases. These purges are controlled by the EVAP mechanism. Note that problems with the EVAP canister could set off the “check engine light.” The filter manifold connects to an air filter. Air is drawn from the environment to pressurize the LDP. A dysfunctional air filter will let in dirt and dust that will then clog and disable the LDP mechanism, leading to further complications.

OBD code P2404 gets stored in the system when the PCM detects problems with the LDP circuit of the EVAP system with the out of range performance issues for the output values.

What causes this problem with the Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance?

• Defective leak detection pump motor or control solenoid
• Faulty or improperly installed fuel cap
• Faulty purge control solenoid
• Clogged or broken charcoal canister
• Broken or cracked vacuum or fuel vapor hoses
• Faulty pressure or flow sensor, or a bad PCM
• Corroded, broken, or shorted system circuitry or connectors
• PCM failure is rare and replacement will require reprogramming

1. Engine Control Module - The solenoid might cause a short in the engine control module because of corrosion in the solenoid or the wire running from the solenoid to the ECM harness.
2. Electronic Control Unit – The ECU power management control module keeps in check the hybrid battery charging functions. If the ECU is faulty, the battery pack will not be able to properly get charged and thus, the ECU might need replacement.
3. Powertrain Control Module - A trouble with the PCM would mean that it is unable to determine the right fuel mixture and would send the car engine either more or less fuel than it requires. Now when the engine gets more, the carbon emission would increase and fuel economy would drop. In case of the opposite, the engine will choke, stutter, and might start stalling sometimes.
4. Diagnostic Tool – Usually any OBD code problem requires deep insight into the problem and high grade tools in order to fix it properly. Thus, buy quality diagnostic tools form us!
5. Fluid Pump Control Module - If the control module is faulty, the pump will not be able to work properly and will not be able to transfer fluid to the transmission and hydraulic system efficiently. Thus, replacements are in order.
6. Oxygen Sensor - The O2 sensor can also be at fault leading to lean or rich engine conditions and thus affecting the engine performance and improper fuel consumption. Buy new sensor and replace the faulty one now!
7. Engine Coolant Temperature Sensor - If there are some issues in your car engine coolant temperature sensor, then it would result in the illumination of the check engine light. The check engine light would keep on flashing until the problem is addressed. Buy new engine coolant temperature sensor from us online.
8. EVAP Leak Detection Pump - LDP pressurizes the fuel system to check for leaks. The whole thing is controlled by the PCM, and it pumps about only about 0.25 psi into the fuel system. If a leak is present, the PCM keeps pumping air into the system until it can figure out how big of a leak there is. After it figures that out, it pops the code that you get to see on your dash.
9. Vapor Canister Valve - When your engine begins to run at regular speed, the EVAP system slowly allows these vapours to be released into your engine, which burn like regular fuel. The flow of these vapours is controlled by your canister purge valve, which regulates when and how much of these vapours enter your engine.
10. Vapor Canister Purge Solenoid - On top of a rough idle, a vehicle with a failing EVAP canister purge valve will display signs of poor engine performance. The engine may feel like its running “weak” and won’t generate sufficient power for acceleration. Accelerating will feel like you’re pressing the pedal down and moving slower. The disrupted combustion process caused by the failing purge solenoid will lead to slow acceleration that needs to be addressed for repairs right away.

We at Parts Avatar Canada care for our customers, and that’s why we will help you to diagnose P2404 code by listing out some major symptoms. They are mentioned below as follows:

Common Symptoms

There is no noticeable performance difference in the vehicle, and many drivers would not notice that they have a problem until the Check Engine light comes on. Even then, it is difficult to tell what’s wrong with the vehicle. When the P2404 code appears, it is common for other trouble codes related to the evaporative emissions control system to show up as well.

Learn the ways with which you can correct this trouble code P2404:

• Canister valve replacement
• Canister purge solenoid replacement
• Leak detection pump replacement
• Faulty wiring and connector replacement
• Fuel filter and O2 sensor replacement
• PCM replacement and reprogramming

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of ECM, O2 Sensor, EVAP System, PCM, Oil Pressure, Purge Valve, Charcoal Canister, Valve Rocker Arms and a lot more. We are sure that now all your issues would be resolved.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2404 code to be stored:

• A suitable scanner (or code reader), a digital volt/ohmmeter, and a smoke machine will be most helpful in performing a successful diagnosis of OBD code P2404.
• Begin with a visual inspection of all wiring and connectors. Repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as necessary.
• Always retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components (Including fuses) appear to be in normal working order, connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data. Continue by clearing the code and operating the vehicle to see if it returns.
• This will help to determine whether or not the malfunction is intermittent. After the codes are cleared, test drive the vehicle to see if the code returns. If the code fails to immediately return, you may have an intermittent condition.
• Intermittent conditions can prove to be quite a challenge to diagnose and in extreme cases may have to be allowed to worsen before a correct diagnosis can be made. Proceed with your diagnostic process by removing and reinstalling the fuel cap and test driving the vehicle (multiple drive cycles may be required to activate a service engine soon lamp) to see if it returns.
• If other evaporative emission control system codes are present, diagnose and repair them as required. Reset the codes and test-drive the vehicle. If an evaporative emissions system leak code is present (and the fuel cap is good), visually inspect vacuum and fuel vapour hoses for cracks, splits, kinks, or breakage, and repair as necessary.
• Inspect the charcoal canister and purge valve for damage or corrosion, replace faulty parts as needed. Start the engine and listen for vacuum leaks near the purge control valve or the hose from the purge valve to the intake. If no leaks are detected, a smoke machine can be very helpful for locating leaks in the extensive network of vacuum and fuel vapour lines that are required for the evaporative emissions control system.
• Place the vehicle on a lift so that you can observe it from underneath and start the engine and allow it to enter closed loop operation. Listen carefully to the purge control solenoid. Once the solenoid begins to make a clicking noise, the purge valve should be opened.
• Place the nozzle of the smoke machine hose into the vacuum supply hose for the purge solenoid and allow the system to fill with smoke. Visually inspect all lines, hoses, and system components for escaping smoke.
• Pay particular attention to the area around the fuel cap, as faulty gas caps are common.
• Remember that the charcoal canister usually has a vent which will allow smoke to escape slowly. Evaporative emission control system codes that pertain to flow can be best diagnosed beginning with the charcoal canister.
• A charcoal canister that has become contaminated with liquid can get clogged and restrict purge flow. Check for suction at both sides of the charcoal canister when the purge control solenoid is opened.
• If there is suction to the canister, it is probably faulty. Remove the canister and shake it, listening for broken or loose particles. Replace the canister as necessary. If the canister proves to be functional, check fuel vapour hoses for kinks from crushing. If the canister and lines appear normal, test the purge control solenoid for proper operation.
• It should act like “on/off” valve that is activated by completing a circuit that is normally rated for battery voltage. Check manufacturer’s specs before applying voltage to the solenoid.
• If the solenoid is faulty, an evaporative emissions control circuit code should also be exhibited. If an evaporative emission control system circuit code is present, inspect electrical connectors and wiring for signs of corrosion or damage and repair as required.
• If wiring and connectors appear to be operational, unplug the connector from the PCM and perform a resistance check on the purge control solenoid, the system pressure and flow sensors, and system wiring.
• Compare your findings to manufacturer’s specifications and repair as necessary. Reset the codes and retest the vehicle. Keep in mind, that following repairs, multiple drive cycles may be necessary to verify that the fault condition has been rectified.
• Activate the leak detection pump motor and check for system voltage at the leak detection pump connector.
• Check if the voltage or ground signal are present or not, and disconnect the electrical connectors from the pump and all related controllers to perform a continuity and resistance test on all system circuits.
• Test for related circuits and repair or replace open or shorted circuits, connectors, and components as required.
• If the LDP is working properly, suspect for motor pump failure that might need replacement.

Common Mistakes When Diagnosing the P2404 Code

The complexity and awkward location of the LDP pump and related equipment means that installation and repairs are best left to a professional. Mechanical access difficulties as well as accurate pump calibration complicate LDP pump installation and proper function. Identifying leak location is the next challenge, and this may not be simple or obvious. LDP installation, repairs and other related issues are best left to experts. The money spent is well worth it in reduced risk to other vehicle components from improper installation or diagnosis of LDP-related issues.