<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The engine control module (ECM) detects an issue with the throttle control airflow at idle, triggering the engine light. This can be caused by a malfunctioning throttle body, dirty throttle plate, or issues with the idle air control valve.</li> <li><b>Rough Idle</b>: The engine may experience rough idling due to insufficient airflow at idle. Potential causes include a clogged air filter, vacuum leaks, or a faulty throttle position sensor.</li> </ul>

<ul><li>Accumulation of dirt and carbon deposits on the throttle body can restrict airflow, leading to insufficient air intake at idle.</li><li>Leaks in the intake system can cause unmetered air to enter, disrupting the air-fuel mixture and resulting in low airflow at idle.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P3078 and check for any additional codes.</li> <li><b>Visual Inspection</b>: Inspect the throttle body and air intake system for any visible obstructions, dirt, or damage.</li> <li><b>Throttle Body Cleaning</b>: Clean the throttle body to remove any carbon buildup or debris that may be restricting airflow.</li> <li><b>Check Throttle Position Sensor (TPS)</b>: Test the TPS for proper operation using a multimeter. Ensure it is providing the correct voltage readings.</li> <li><b>Inspect Idle Air Control (IAC) Valve</b>: Check the IAC valve for proper function. Clean or replace if necessary.</li> <li><b>Check for Vacuum Leaks</b>: Inspect all vacuum lines and connections for leaks that could affect idle airflow.</li> <li><b>ECU Software Update</b>: Verify if there are any available software updates for the ECU that address throttle control issues.</li> <li><b>Perform Throttle Body Relearn Procedure</b>: Follow the manufacturer's procedure to relearn the throttle body position to the ECU.</li> <li><b>Final Test Drive</b>: Conduct a test drive to ensure the issue is resolved and the DTC P3078 does not reappear.</li></ul>

<p>The DTC code P3078 indicates that the throttle control airflow at idle is too low. This is a critical issue as it can lead to engine stalling, poor acceleration, and potential safety hazards.</p><ul><li><b>Immediate Actions:</b> Inspect the throttle body for carbon buildup or mechanical issues.</li><li>Check for vacuum leaks or faulty sensors.</li><li>Addressing this promptly is crucial to avoid engine performance issues and potential safety risks.</li></ul>