EVAP Check Valve
- Remove EVAP check valve from vacuum hose. See Figure. Apply air pressure to Blue colored side of EVAP check valve. Air should flow through EVAP check valve.
- Apply air pressure to Black colored side of EVAP check valve. Air should not flow through EVAP check valve. Replace EVAP check valve if defective. The EVAP check valve should be installed with Black colored side toward the throttle body.