Pic. 2.354. Elements of the fuel vapor recovery system
Pic. 2.355. Canister purge solenoid valve
Checking the canister purge solenoid valve
Disconnect the vacuum hose (black with red stripe) from the solenoid valve.
Disconnect the solenoid valve connector.
Note. The canister purge solenoid valve is controlled by the electronic engine control unit; at low coolant temperatures, as well as when the engine is idling, the valve is closed, and evaporating fuel does not enter the intake manifold receiver. However, on a warm engine and during normal driving, the valve opens, and fuel vapor enters the intake manifold receiver.
Note. When disconnecting vacuum hoses, always pre-mark alignment marks so that the hoses are set in their original position when connected.
Pic. 2.356. Connecting the hand vacuum pump
Connect a hand vacuum pump to the solenoid valve fitting from which the red striped vacuum hose was disconnected (pic. 2.356).
Pic. 2.357. Checking the canister purge solenoid valve
Create a vacuum with a vacuum pump and check the operation of the valve by connecting / disconnecting battery power to the valve terminals (pic. 2.357).
Pic. 2.358. Current measurement at valve terminals
Measure the current at the solenoid valve terminals (pic. 2.358).
Data for verification
Winding (at 20°C): 0.45A or less (at 12 V).
Winding resistance: 26 ohm (at 20°C).
Checking the vacuum hose
Pic. 2.359. vacuum hose
Engine coolant temperature: 80-95°C.
Disconnect the vacuum hose from the evaporative emission system connector on the intake manifold and connect a hand vacuum pump to the connector.
Start the engine and check that as the engine speed increases, the vacuum remains almost constant.
Note. If vacuum is not created, then there are probably deposits in the channel of the vacuum hose fitting (in throttle body), and needs to be cleaned.
Adsorber check
Check the condition of the adsorber safety valve (CCV) and its filter, as shown in the figure.
Visually inspect the evaporative emission system hoses for loose connections, damage, or sharp kinks.
Visually check that there are no deformations, cracks or fuel leaks at the joints.
Pic. 2.360. Adsorber
Remove the adsorber and check it for cracks or damage (pic. 2.360).
Checking the two-way valve
Pic. 2.361. Checking the two-way valve
Be convinced that air passes through the valve in the direction shown in drawing 2.361.
When installing the valve, make sure it is correctly oriented according to the arrow marked on the valve body.
Checking the fuel filler cap
Pic. 2.362. cover gasket
Check the condition of the cap O-ring and fuel filler cap for damage or deformation. Replace filler cap if necessary (pic. 2.362).