Evaporative Emission System Schematic
Note: Checking the two-way and non-return valves is given in chapter "fuel injection system (MFI)".
System check
1. Disconnect the vacuum hose (with red stripe) from the throttle body and connect a hand vacuum pump to the vacuum hose.
2. Check the vacuum at the indicated engine operating conditions when the engine is cold (coolant temperature 60°C or lower) and when the engine is warm (coolant temperature 80°C or higher).
- A) When the engine is cold, in good condition at idle and at an engine speed of 3000 rpm, the vacuum created is maintained at 50 kPa.
- b) When the engine is warm, then:
- At idle, the vacuum created is maintained at 50 kPa.
- Within about 3 minutes after the engine reaches 3000 rpm, an attempt is made to create a vacuum and the vacuum is reduced.
- 3 minutes after the engine reaches 3000 rpm, the vacuum created will be 50 kPa, the moment will be held and will decrease again.
Adsorber check
1. Check the evaporative emission system lines for loose connections, sharp kinks, or damage.
2. Check for deformation, cracks and fuel leaks.
3. After removing the adsorber, check it for cracks and deformation.
Checking the canister purge solenoid valve
Note:
- The car is equipped with an adsorber purge solenoid valve with a pulse-width control mode.
- When disconnecting vacuum hoses, always pre-mark alignment marks so that the hoses are set in their original position when connected.
1. Disconnect the vacuum hose (black with red stripe) from the canister purge solenoid valve.
Engines 2.0 l / 2.4 l. | Engine 2.7 l. |
2. Disconnect the harness connector from the solenoid valve.
3. Connect a hand vacuum pump to the solenoid valve fitting from which the red striped vacuum hose was disconnected.
4. Vacuum and test valve operation by connecting/disconnecting battery power to solenoid valve leads.
- A) If the valve is good, the vacuum will decrease when battery voltage is applied.
- b) If the valve is OK, the vacuum will be maintained when the battery voltage is not applied.
5. Measure the winding resistance between the terminals of the canister purge solenoid valve.
- Rated value (at 20°С): 26 ohm
Checking the canister purge vacuum hose fitting
Note: Before checking, warm up the engine so that the coolant temperature reaches 80-90°C.
1. Disconnect the vacuum hose from the canister purge channel fitting on the intake manifold and connect a hand vacuum pump to the fitting.
2. 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.
Checking the fuel filler cap
1. Check the condition of the cap O-ring and fuel filler cap (no damage or deformation). If necessary, replace the filler cap.
2. The fuel filler cap is equipped with a safety valve to prevent the release of fuel vapors into the atmosphere. Check that the relief valve functions properly with both overpressure in the fuel tank and overpressure in the fuel tank (see picture).