Gasoline vapor recovery system (4 cylinder engine)
1. Spool valve; 2. Control valve; 3. Recirculation valve; 4. Converter; 5. Fitting for servicing the gasoline vapor absorption system; 6, 19, 20. Pneumatic distributor; 7. Cork; 8. Hose; 9. Ventilation hose; 10. Filler pipe; 11. Purge line; 12. Inlet line; 13. Buck; 14. Shut-off valve; 15. Ventilation line; 16. Pressure sensor; 17. Fuel limit valve; 18. Tank with absorber
Gasoline vapor recovery system (6 cylinder engine)
1, 2, 7, 9. Pneumatic distributor; 3, 5. Buffer chamber; 4. Recirculation valve; 6. Fitting for servicing the gasoline vapor absorption system; 8. Tank with absorber; 10. Gasoline vapor line; 11. Cork; 12. Ventilation hose; 13. Filler pipe; 14. Purge line; 15. Inlet line; 16. Shut-off valve; 17. Buck; 18. Fuel limit valve; 19. Ventilation line; 20. Pressure sensor
The system is designed to absorb fuel vapors and burn them in the combustion chamber. The location of the tank with the absorber of this system depends on the model of the car and the year of manufacture.
Examination
Tank check (for vehicles from 1997 and vehicles with V6 engine from 1998)
1–4. Connections A–D
5. Air supply
When air is supplied to the tank purge port, the air must exit through port B, ports C and D must be plugged.
Tank check (for 1998 vehicles with 4-cylinder engine and all 1999 vehicles)
1. Hose for gasoline vapors; 2. cap; 3. Purge hose; 4. Disconnect; 5. Air supply
When air is supplied to the tank purge fitting, the air must exit through the gasoline vapor hose.
Checking the fuel vapor pressure sensor on a 1998 vehicle with a 4-cylinder engine
1. Voltmeter; 2. Disconnect; 3. Sensor (type A); 4. Sensor (type B); 5. Tank with absorber
Location of the fuel vapor pressure sensor on early models
1. Voltmeter
2. Disconnect
Absorber tank and related parts (a / m 1997)
1. Air hose connection; 2, 5, 7, 8, 9, 12. Hose; 3, 10. Pneumatic distributor connectors; 4. Air temperature sensor connector; 6. Tank; 11. Air filter cover
1. Check the condition of the hoses and pipes of the system. Remove and inspect the canister by applying slight pressure to the purge fitting (see fig. Tank check (for vehicles from 1997 and vehicles with V6 engine from 1998) and fig. Tank check (for 1998 vehicles with 4-cylinder engine and all 1999 vehicles)).
2. Check Vapor Pressure Gauge (see fig. Checking the fuel vapor pressure sensor on a 1998 4-cylinder engine).
The sensor is mounted either on the tank or in the engine compartment, next to the air filter. The voltage at the terminals of the sensor connector with the ignition on should be 4.5–5.5 V. When a vacuum is created in the sensor, the voltage should decrease to 2 V, and when pressure is applied to the sensor, the voltage should increase slightly (for this test, the connector must be attached to the sensor and connected (+) – instrument probe to the rear side of the VC terminal).
3. Check the resistance of the coils of all pneumatic valves, including the pressure sensor distributor, which is mounted next to the tank (see fig. Absorber tank and related parts (a / m 1997). The resistance should be 33-39 ohms.
Replacement
1. To remove the tank, disconnect the battery from the ground, mark and disconnect the hoses from the tank, unscrew the bolts. On some cars, the tank goes from below.
2. To remove the valves and pressure sensor, first remove the tank, and then remove each of these devices (on the V6 engine they are mounted under the cylinder head cover)