Models with a carburetor engine
Charcoal Filter Hose Connection Identification
Examination
1. If you think the system is faulty, disconnect the hoses from the carbon filter and thermal vacuum valve and purge them.
2. To check the thermal vacuum valve, which is installed on the right side of the intake manifold, when the engine is cold, disconnect both hoses from the valve. Connect a hose to one of the valve ports and blow into it. The valve must be closed and must not let air through. Start the engine and warm it up to normal operating temperature. Blow into the hose again; the valve must be open and air must flow freely. If the valve does not work as described above, replace it.
3. The carbon filter is located in the right rear corner of the engine compartment. The carbon filter and its valves can be checked as follows.
4. Walk along the hose "A" from the carbon filter and disconnect it from the tee. Start the engine and try to draw air from the hose; the valve should not let air through, and the engine speed should increase slightly. Connect the hose back to the tee.
5. Walk along the hose "WITH" from the carbon filter and disconnect it from the carburetor float chamber. Start the engine and blow into the hose; the valve must not let air through. Connect the hose back to the carburetor.
6. Walk along the hose "IN" from the carbon filter and disconnect it from the intake manifold. With the engine off, blow into the hose and draw the air out of the hose into you; The valve must not allow air to flow in any direction. Connect the hose back to the intake manifold.
7. If during the checks described in paragraphs. 4-6, there was an air leak through any of the hoses, the carbon filter and its valves must be replaced.
Models "Phase I" (1993 release model, until June) with 2.0L engine and multiport fuel injection system
Examination
1. If you think that the system is faulty, disconnect the hoses from the carbon filter installed in the right rear corner of the engine compartment and blow through them.
2. The carbon filter and its valves can be checked as follows. Disconnect the hoses from the carbon filter and blow into the nozzle "A"; the valve must not let air through. Blow out each of the nozzles "IN" in turn. Both channels must be open and allow air to flow freely. If the checks do not give the expected results, the carbon filter and valves must be replaced.
All other models with fuel injection
Examination
1. If you think the system is faulty, disconnect the hoses from the carbon filter and solenoid valve and purge them. On models with a 1.6 liter engine, the carbon filter is located in the left rear corner of the engine compartment, and the solenoid valve is located on the rear side of the intake manifold. On models with a 2.0 liter engine, the charcoal filter is located on the left side of the engine compartment, and the solenoid valve is located on the left or lower side of the intake manifold.
2. The solenoid valve can be tested using the wiring diagram shown.
If necessary, remove the valve following the instructions given in subsection 6.4.2.3.3, to improve access.
3. Blow into the nozzle "A" and check that no air is passing through it. Blow into the nozzle "IN" and check that air flows through this nozzle and out of the nozzle "WITH".
4. Through the fuse, connect a 12 volt power supply to the solenoid valve as shown in the figure. After applying voltage, blow into the nozzle "A" and check that air passes through the valve and out of the nozzle "IN". Blow into the nozzle "IN" and check that air passes through the valve and out of the nozzle "WITH".
5. If the solenoid valve does not work as expected, then it is defective and needs to be replaced.
6. The carbon filter and valves can be checked as described higher.