A P2407 diagnostic trouble code (DTC) indicates a problem with the Evaporative Emission System (EVAP) Leak Detection Pump Control Circuit Low. This system prevents fuel vapors from escaping into the atmosphere. This article explains what a P2407 code means, common causes, and how to address it, including completing a Mazda drive cycle.
What Does a P2407 Code Mean?
The P2407 code specifically points to a low voltage signal detected in the control circuit of the EVAP leak detection pump. This pump pressurizes the EVAP system to check for leaks. A low voltage signal suggests a potential issue with the pump itself, its wiring, or the related control module.
Common Causes of a P2407 Code
Several issues can trigger a P2407 code:
- Faulty EVAP Leak Detection Pump: The pump itself might be malfunctioning due to mechanical or electrical issues.
- Wiring Problems: Damaged, corroded, or disconnected wiring in the pump’s control circuit can disrupt the voltage signal.
- Connector Issues: Loose, damaged, or corroded connectors can also interrupt the signal.
- EVAP System Leaks: While the P2407 code relates to the pump control circuit, leaks in the EVAP system can sometimes contribute to this issue.
- PCM Issues: In rare cases, a problem with the Powertrain Control Module (PCM) might be the root cause.
Diagnosing and Fixing a P2407 Code
Resolving a P2407 code typically involves these steps:
- Code Retrieval: Use an OBD-II scanner to confirm the P2407 code and check for other related codes.
- Visual Inspection: Examine the EVAP leak detection pump, wiring, and connectors for any visible damage.
- Voltage Test: Use a multimeter to check the voltage at the pump connector and along the wiring harness.
- Pump Test: If voltage is present, test the pump itself to ensure it’s functioning correctly.
- Leak Test: Although less likely with a P2407, check the EVAP system for leaks using a smoke machine or pressure test.
- Component Replacement: Replace any faulty components, such as the pump, wiring, or connectors.
- PCM Check: If other solutions fail, diagnose the PCM for potential problems.
Completing a Mazda Drive Cycle to Clear the Code
After repairs, clearing the code and completing a Mazda drive cycle are crucial to ensure the issue is resolved. A drive cycle allows the vehicle’s onboard diagnostic system to run its monitors and verify proper EVAP system function. Here’s a general outline of a Mazda drive cycle:
- Preparation: Ensure a fuel level between 15% and 85%, turn off all accessories, and ideally start with a cold engine (after an 8-hour soak).
- Idle: Start the engine and let it idle for 5 minutes.
- Revving: Rev the engine in neutral or park to 2300-2700 RPM for 15 seconds, then to 3800-4200 RPM for 15 seconds.
- Idle: Idle for 20 seconds after the cooling fan stops.
- Driving: Accelerate to 52-55 mph and maintain this speed for 90 seconds.
- Deceleration and Varied Speed Driving: Decelerate to 15 mph and drive for 13 minutes at speeds between 15 and 35 mph.
- Steady Speed: Maintain a steady 25 mph for 50 seconds.
Note: Drive cycle specifics can vary slightly between Mazda models. Consult your vehicle’s repair manual for the most accurate procedure. Monitoring drive cycle progress with an OBD-II scanner can be helpful.
Conclusion
The P2407 code indicates a problem within the EVAP system’s leak detection pump control circuit. Diagnosing and repairing this issue involves checking the pump, wiring, connectors, and potentially the PCM. Completing a Mazda drive cycle after repairs is essential to confirm the fix and clear the code. Addressing this issue promptly helps maintain your vehicle’s emissions performance and prevents further problems.
