Device and repair of Toyota RAV4 SUVs (Toyota RAV) - System of catching of vapors of fuel (EVAP)-//

Toyota PAB4-Toyota RAV4
1. Operation of the car
2. Maintenance
3. Engines
4. Cooling systems and conditioning
5. Fuel system and system of production of the fulfilled gases
6. System of ignition
7. The control system and decrease in toxicity of the fulfilled gases
   General information
   Technical characteristics
   System of onboard Diagnostics (OBD)
   Information sensors and executive stroystvo
   Codes of malfunctions of the OBD-II system
   Control unit of the engine (PCM)
   Sensors and valves of system of injection of fuel (EFI)
   System of compulsory ventilation of Carter (PCV)
   System of recirculation of the fulfilled gases (EGR) on models since 2001
   System of catching of vapors of fuel (EVAP)
   Catalytic converter
8. Coupling
9. Transmission
10. Driveshaft and shaft of the drive of driving wheels
11. Brake system
12. Suspension bracket
13. Steering and running gear
14. Body
15. Electric equipment
Schemes of electric equipment


Toyota RAV4>> The control system and decrease in toxicity of the fulfilled gases>> System of catching of vapors of fuel (EVAP)
The system of catching of vapors of fuel (EVAP) accumulates fuel vapors in the special container with absorbent carbon — an absorber, and during the operation of the engine mixes them with fresh air and gives to engine cylinders where they are burned up.

Fig. 7.28. An arrangement of elements of system of catching of vapors of fuel (EVAP) on models till 2001: 1 – valve of compulsory ventilation of a case; 2 – the vacuum modulator of system of repeated combustion of the fulfilled gases; 3 – the valve of system of repeated combustion of the fulfilled gases; 4 – sensor of pressure of vapors of fuel; 5 – vacuum valve of the sensor of pressure of vapors of fuel; 6 – container with absorbent carbon; 7 – vacuum valve of system of catching of vapors of fuel; 8 – oxygen sensor (block 1 sensor 2); 9 – the vacuum valve of system of repeated combustion of the fulfilled gases; 10 – oxygen sensor (block 1 sensor 1)


Fig. 7.29. An arrangement of elements of system of catching of vapors of fuel (EVAP) on models since 2001: 1 – valve of compulsory ventilation of a case; 2 – vacuum valve of system of catching of vapors of fuel; 3 – the leveling tank; 4 – service socket of system of catching of vapors of fuel; 5 – the vacuum valve of the valve of closing of a canister with absorbent carbon (CCV); 6 – fuel valve; 7 – tube of control of pressure; 8 – ventilating tube; 9 – cover of a jellied mouth of the fuel tank; 10 – returnable hose; 11 – sensor of pressure of vapors of fuel; 12 – the vacuum valve operating pressure valve; 13 – an opening for air supply; 14 – cleaning hose; 15 – a canister with absorbent carbon; 16 – hose of the control system of release of vapors of fuel; 17 – fuel tank


On models since 2001 of release the container with absorbent carbon is established in a motor compartment, and on models till 2001 — under the car, behind the fuel tank (fig. 7.28, 7.29) .
At the idle engine of couple of fuel are transferred from the fuel tank, throttle knot and an inlet collector to the container with absorbent carbon where they gather. After launch of the engine of couple of fuel are removed from capacity via the adjusting valve of cleaning and move in engine cylinders for burning. The adjusting valve of cleaning is run by the control unit of the engine.
The cover of a jellied mouth of the fuel tank has the backpressure valve of double action. At malfunction of system of catching of vapors of fuel, and increase in pressure in the fuel tank, the valve lets off steam of fuel in the atmosphere.

Fig. 7.30. An arrangement of the sensor of pressure of vapors of fuel on models till 2001 of release


The system of catching of vapors of fuel turns on the sensor of pressure (fig. 7.30) which reacts to change of pressure of vapors of fuel. On models till 2001 of release the sensor is installed on a partition of a motor compartment, and on models since 2001 of release — in the top part of the fuel tank on the block of the pump/fuel level sensor.
After launch of the engine and its warming up up to previously established temperature, the vacuum valve (VSV) opens, opening the cleaning valve therefore the vacuum created in an inlet collector extends fuel vapors from the container with absorbent carbon. Further vapors of fuel mix up with the air coming to the engine and are burned together with fuel mix in engine cylinders.
The sensor of pressure of vapors of fuel located in the fuel tank controls pressure of vapors in the fuel tank and when pressure exceeds previously established threshold, the vacuum valve opens, and vapors of fuel come out a tank and gather in a canister with absorbent carbon.
You make replacement of container with absorbent carbon as follows:
– switch off ignition and disconnect a wire of "weight" from the rechargeable battery;
– on models since 2001 lift a back part of the car and fix on support;
– mark and disconnect all electric sockets and hoses from the container with absorbent carbon;
– turn out bolts and remove capacity from a motor compartment or from under the car.
You make installation in the sequence, the return to removal.