DTC Code P1470 – What does this code mean for BMW?

<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: <b>Engine Light ON</b> indicates a problem with the Leakage Diagnostic Pump Control Circuit. This could be due to <causes> such as a faulty pump, wiring issues, or a malfunctioning control module.</li> <li><b>Failed Emissions Test</b>: <b>Failed Emissions Test</b> can occur because the Leakage Diagnostic Pump is part of the evaporative emission control system. A malfunction here can lead to increased emissions.</li> <li><b>Poor Fuel Economy</b>: <b>Poor Fuel Economy</b> might be experienced as the evaporative emission control system is not functioning optimally, potentially causing fuel vapors to escape.</li> <li><b>Fuel Smell</b>: <b>Fuel Smell</b> around the vehicle could be a symptom, indicating that the evaporative emission system is not containing fuel vapors properly.</li> </ul>

<ul><li>The Leak Detection Pump (LDP) may be faulty, leading to improper operation and triggering the error code.</li><li>An open or shorted harness in the Leak Detection Pump can disrupt the electrical flow, causing the system to malfunction.</li><li>Poor electrical connections in the Leak Detection Pump circuit can result in intermittent or failed communication, leading to the error code.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P1470 and check for any additional codes.</li> <li><b>Visual Inspection</b>: Inspect the wiring and connectors related to the Leakage Diagnostic Pump (LDP) for any signs of damage, corrosion, or disconnection.</li> <li><b>Check Power Supply</b>: Verify that the LDP is receiving the correct voltage by using a multimeter to check the power supply at the pump's connector.</li> <li><b>Test Ground Connection</b>: Ensure the ground connection for the LDP is secure and has low resistance. Use a multimeter to measure the resistance between the ground pin and a known good ground.</li> <li><b>Inspect Control Circuit</b>: Check the control circuit from the Engine Control Module (ECM) to the LDP for continuity and proper operation. Use a wiring diagram to trace the circuit.</li> <li><b>LDP Function Test</b>: Perform a functional test of the LDP using a diagnostic tool to activate the pump and observe its operation.</li> <li><b>ECM Check</b>: If all other components are functioning correctly, inspect the ECM for any faults or issues that may be affecting the LDP control circuit.</li> <li><b>Clear Codes and Test Drive</b>: After repairs, clear the DTC codes and perform a test drive to ensure the issue is resolved and the code does not reappear.</li></ul>

<p>The DTC code P1470 for BMW indicates an issue with the Leakage Diagnostic Pump Control Circuit Electrical. This is a critical issue as it affects the vehicle's evaporative emission control system.</p><ul><li><b>Immediate Actions:</b> Inspect the wiring and connectors for damage or corrosion.</li><li>Check the pump control circuit for proper voltage and ground.</li><li>Replace the leakage diagnostic pump if necessary.</li></ul><p>Delaying repair can lead to increased emissions and potential engine performance issues.</p>