How to Detect EVAP Leakage

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

Never use compressed air or a high pressure pump.
Never exceed 4.12 kPa (0.042 kg/cm² , 0.6 psi) of pressure in EVAP system.

NOTE:

Never start engine.
Improper installation of EVAP service port adapter (commercial service tool) to the EVAP service port may cause a leak.

WITH CONSULT

Attach the EVAP service port adapter (commercial service tool) securely to the EVAP service port.
- EVAP canister purge volume control solenoid valve (1)
- : Vehicle front
Fig 1: Identifying EVAP Canister Purge Volume Control Solenoid Valve And EVAP Service Port
Courtesy of NISSAN NORTH AMERICA, INC.
Also attach the pressure pump and hose to the EVAP service port adapter (commercial service tool).
Turn ignition switch ON.
Select the "EVAP SYSTEM CLOSE" of "WORK SUPPORT MODE" with CONSULT.
Touch "START". A bar graph (Pressure indicating display) will appear on the screen.
Apply positive pressure to the EVAP system until the pressure indicator reaches the middle of the bar graph.
Remove EVAP service port adapter (commercial service tool) and hose with pressure pump. Refer to "REMOVAL AND INSTALLATION ".

Fig 2: Installing EVAP Service Port Adapter And Pressure Pump To EVAP Service Port
Courtesy of NISSAN NORTH AMERICA, INC.
Locate the leak using a leak detector (commercial service tool). Refer to "DESCRIPTION ".

Fig 3: Identifying EVAP Leak Detector

Courtesy of NISSAN NORTH AMERICA, INC.

WITHOUT CONSULT

Attach the EVAP service port adapter (commercial service tool) securely to the EVAP service port (2).
- EVAP canister purge volume control solenoid valve (1)
- : Vehicle front
Fig 4: Identifying EVAP Canister Purge Volume Control Solenoid Valve And EVAP Service Port
Courtesy of NISSAN NORTH AMERICA, INC.
Also attach the pressure pump with pressure gauge to the EVAP service port adapter (commercial service tool).

Fig 5: Installing EVAP Service Port Adapter And Pressure Pump To EVAP Service Port
Courtesy of NISSAN NORTH AMERICA, INC.
Apply battery voltage between the terminals of EVAP canister vent control valve (3) to make a closed EVAP system.
- Fuel filler pipe (top of frame view) (1)
- EVAP control system pressure sensor (2)
- EVAP canister (4)
- Drain filter (5)
- : Vehicle front
To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to 0.028 kg/cm² , 0.2 to 0.4 psi).
Remove EVAP service port adapter (commercial service tool) and hose with pressure pump. Refer to "REMOVAL AND INSTALLATION ".

Fig 6: Identifying Fuel Filler Pipe, EVAP Control System Pressure Sensor, EVAP Canister Vent Control Valve, EVAP Canister And Drain Filter
Courtesy of NISSAN NORTH AMERICA, INC.
Locate the leak using a leak detector (commercial service tool). Refer to "DESCRIPTION ".