Circuit/System Description
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The evaporative emission (EVAP) system uses an EVAP leak detection pump to test for system leaks. The EVAP leak detection pump assembly consists of the following components:
- EVAP leak detection pump with reference orifice
- EVAP leak detection pump switching valve
- EVAP leak detection pump pressure sensor
The ECM commands the EVAP leak detection pump control circuit through an internal switch called a driver. The ECM monitors the commanded and actual status of the driver. If the ECM detects they do not match a DTC sets.