EVAP Canister

Check EVAP canister as follows:

1. Block port B. 
2. Blow air into port A  and check that it flows freely out of port C. 
3. Release blocked port B. 
4. Apply vacuum pressure to port B  and check that vacuum pressure exists at the ports A  and C. 
5. Block port A  and B. 
6. Apply pressure to port C  and check that there is no leakage.

Fig 1: Identifying EVAP Canister And Ports

Courtesy of NISSAN MOTOR CO., U.S.A.