See Figure 1
The evaporative emission control system prevents the escape of fuel vapors to the atmosphere under hot soak and engine off conditions by diverting the vapors to and storing them in a carbon canister. When the engine is running and reaches the proper temperature, the system purges the vapors from the canister to the engine where they are efficiently burned.
The evaporative emission control system consists of the carbon canister, the CANP purge control solenoid(s), purge valve(s), the fuel tank vapor hose, and the fuel vapor return line.
- Inspect the canister hose and inlet nipple for blockage.
- Inspect fuel evaporative emission system for blockage.
- Inspect the vapor tube and the hoses for kinks or pinched areas.
- Inspect the vapor hose routing between the fuel tank and the body for kinks or pinched areas.
REMOVAL & INSTALLATION
The carbon canister stores the fuel vapor by absorbing it until it is returned to the engine to be burned. There should be no liquid in the canister.
- Disconnect the canister purge hose from the air cleaner fitting.
- Loosen the canister retaining bracket and lift out the canister.
- Attach the canister to the retaining bracket.
- Connect the purge hose to the air cleaner fitting.
See Figures 2 and 3
The fuel tank vapor valve vents the fuel vapor from the tank to the carbon canister for storage. The valve is located in the upper area of the fuel tank.
- Disconnect the negative battery cable.
- Raise and safely support the vehicle.
- Remove the fuel tank from the vehicle.
- Disconnect the hoses and remove the vapor valve from the grommet in the fuel tank.
- Install the vapor valve to the tank and attach the hoses.
- Install the tank in the vehicle.
- Check for leaks.
- Lower the vehicle. Connect the negative battery cable.
See Figure 4
The Ported Vacuum Switch (PVS) turns the purge vacuum valve on as the engine warms up. It also allows the purge valve to close when the engine is turned off and the vacuum is lost.
See Figure 5
The Vapor Management (VMV) valve is the part of the emissions system that is controlled by the PCM. This valve controls the flow of vapors purging from the carbon canister to the intake manifold during various engine operating modes. The VMV is normally a closed valve.