The system uses the method of vapor absorption by a carbon adsorber.
It is mounted on the rear suspension cross member and connected by pipes to the fuel tank and the purge solenoid valve
In the engine compartment, on the air supply pipe, there is an adsorber purge solenoid valve, which, by signals from the engine control unit, switches the system operation modes
Fuel vapors from the fuel tank are constantly discharged through the pipeline and accumulate in the adsorber filled with activated carbon (adsorbent).
When the engine is running, the adsorbent is regenerated (recovered) by blowing the adsorber with fresh air
Air enters the system under the action of vacuum transmitted through the pipeline from the inlet pipe to the adsorber cavity when the purge valve is opened
The engine control unit regulates the intensity of the adsorber purge depending on the engine operating mode by sending a signal to the valve with a variable pulse frequency
Fuel vapors from the canister through the pipeline enter the engine intake pipe and burn in the cylinders.
If the evaporative emission system malfunctions, it is possible:
- - idling instability until the engine stops;
- - increased toxicity of exhaust gases and deterioration of driving performance of the car
Removing and installing the canister purge valve
We prepare the car and disconnect the negative battery terminal
Disconnect the block of wires from the adsorber purge valve
Squeeze the ears of the clamp and disconnect the hose from the side pipe of the canister purge valve
Disconnect the wire harness holder from the air filter cover
Disconnect the hose from the lower branch pipe of the canister purge valve
And remove the valve by pulling its leg out of the hole in the tide of the air supply pipe
Install the valve in reverse order
Removing and installing the adsorber
We remove the adsorber to check or replace it if a persistent smell of gasoline appears, caused by leakage of the adsorber.
Violation of the tightness of the adsorber can cause unstable operation of the engine at idle until the engine stops
Reducing the fuel pressure in the fuel supply system, as indicated in the article "Checking and reducing the fuel pressure of the 2AZ-FE engine of a Toyota Camry car"
Remove the fuel tank, as indicated in the previous article
Disconnect the vacuum and ventilation hose from the adsorber by squeezing the clamps
We unscrew the two mounting bolts and remove the adsorber
Install parts in reverse order