P043E - EVAPORATIVE EMISSION SYSTEM LEAK DETECTION EVAPORATIVE EMISSION SYSTEM LEAK DETECTION LOW FLOW REFERENCE ORIFICE
POST UPDATED IN February, 2023
Description of DTC code P043E Generic
The Evaporative Emission Control System, known as the EVAP System, is designed to store fuel vapors to prevent them from escaping into the atmosphere. This system has a ventilated tank that stores these vapors until it is possible to burn them completely under the appropriate conditions.
There are EVAP systems that have an electronic leak detector pump that generates pressure within the system, allowing the flow or leak detection to be checked. The leak detection reference orifices may be at one or more points in the system and are generally in-line, thus measuring an accurate degree of flow with the pump active. The PCM employs the input signal from the sensors and the reference orifices to detect if the leak detection system is operating correctly.
When the DTC P043E OBDII code is stored, it is because the PCM detected discrepancies in the EVAP leak detection reference orifice due to a low flow condition.