How does the purge valve work in an EVAP system?
How does the purge valve work in an EVAP system?
The Purge Valve will open, letting the engine make a vacuum in the EVAP system. After a specific time interval (around 10 seconds), the Purge Valve will shut off, giving the Fuel Tank Pressure Sensor chance to measure the vacuum level in the system. Then, a countdown will start to measure the rate of vacuum decay in the system.
How does the evaporative emission control system work?
When the module deems conditions to be correct, it commands a solenoid to open the purge valve. Opening the purge valve creates a vacuum that pulls fresh air through the vapor canister. The fresh air picks up the fuel vapors and delivers them to the engine to be burned during the normal combustion process.
How does the ECM control the purge valve?
The ECM controls the valve by operating the ground circuit, opening the purge valve at specific times allowing these gasses to enter the engine. The ECM monitors the ground circuit as well, watching for faults. When the purge solenoid isn’t activated, the ECM should see a high voltage on the ground circuit.
What are the components of an EVAP system?
The EVAP system is a collection of components working together to prevent fuel vapors from entering the atmosphere. The main components in an EVAP system include the gas tank, the gas cap, the vent valve, the purge valve, and the charcoal canister.
What is evaporative emissions system?
The Evaporative Emission Control System (EVAP) is used to prevent gasoline vapors from escaping into the atmosphere from the fuel tank and fuel system. The EVAP system usually requires no maintenance, but faults can turn on the Check Engine light and prevent a vehicle from passing an OBD II plug-in emissions…
Where is the EVAP emission canister?
The EVAP emissions control canister is located on the driver side, near the rear tires . Jack up the vehicle from the recommended jack placement and place the rear of the vehicle on jack stands for support. Make sure to keep pressure on the jack after lowering the vehicle onto the jack stands for extra safety.
How does a purge valve work in an EVAP system?
EVAP Purge Valve Operation. A flap in the EVAP purge valve body restricts the motion of fluid and is magnetically attracted by the voltage applied via the valve’s electrical contacts. The flap is attracted to a coil in the evaporative purge system, which closes the valve and blocks the passage of fluids.
What is an EVAP system Purge and vent solenoid?
It is the job of the EVAP vent solenoid to allow air into the charcoal canister so that the EVAP system can pressurize and function properly. When the solenoid is opened, air is allowed into the EVAP system to relieve any pressure that may be present as a result of purging the EVAP system.
