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P2401, P2402 Evap leak detection pump failure, PCM failure, Wiring issue

Land Rover OBD-II Trouble Codes -------------------------------------------------The diagnostic trouble codes (DTCs) P2401 and P2402 both relate to issues with the Evaporative Emission (EVAP) system and the Leak Detection Pump (LDP). Here's a breakdown of each code:

1. **P2401 - Evaporative Emission System Leak Detection Pump Control Circuit Low:**
   - This code indicates a low voltage condition in the control circuit of the EVAP system's Leak Detection Pump.

2. **P2402 - Evaporative Emission System Leak Detection Pump Control Circuit High:**
   - Similar to P2401, but this code points to a high voltage condition in the control circuit of the EVAP system's Leak Detection Pump.

### Possible Causes:

1. **Faulty Leak Detection Pump (LDP):** Issues with the LDP, which is responsible for pressurizing and testing the EVAP system for leaks.

2. **Wiring Issues:** Problems with the wiring or connectors associated with the LDP control circuit.

3. **Powertrain Control Module (PCM) Issues:** A potential failure or malfunction in the PCM, which controls and monitors various aspects of the engine and emissions system.

### Diagnostic Steps:

1. **Inspect Leak Detection Pump (LDP):** Check the LDP for signs of damage or wear. If it appears faulty, consider replacement.

2. **Check Wiring and Connectors:** Inspect the wiring and connectors associated with the LDP control circuit. Look for any signs of damage, corrosion, or loose connections.

3. **Test LDP Operation:** Use a diagnostic tool to test the operation of the LDP. Ensure that it pressurizes the EVAP system properly.

4. **Perform Continuity Tests:** Check for continuity in the wiring from the LDP to the PCM.

5. **Verify PCM Operation:** Test the PCM for proper operation. Replace if necessary.

6. **Clear Codes:** After addressing any identified issues, clear the trouble codes and monitor the system for recurrence.

7. **Consider Professional Assistance:** If you are unsure about diagnosing or addressing these issues yourself, or if the faults persist, it's advisable to consult with a qualified mechanic or technician.

Addressing the root cause of the EVAP system and LDP control circuit faults is crucial for proper emission control and compliance with environmental standards. If in doubt or if the faults persist, seeking professional assistance is recommended for a thorough diagnosis and effective repair.
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