Evaporative Emissions System: Testing and Inspection

Fig. 146 System Test:

SYSTEM INSPECTION

NOTE: Check the condition of the wiring harness and/or vacuum lines and connectors before checking the sensors or switches.

1. Warm up the engine to normal operating temperature.
2. Run the engine at idle.
3. Disconnect the vacuum hose (White) from the solenoid valve and verify that no vacuum is felt at the solenoid valve.
4. If not as specified, check the solenoid valve.



CHARCOAL CANISTER

1. Visually inspect the cannister for signs of damage of cracks. Replace the cannister if necessary.

Fig. 84 Separator:

CHECK AND CUT VALVE

1. Remove the check and cut valve as follows:
a. Lift up the rear mat and trunk side trim.
b. Remove the cover.
c. Mark the hose locations and disconnect the evaporative gas hoses.
d. Remove the check and cut valve.
2. Connect a pressure gauge to the passage from the fuel tank.

Check And Cut Valve Testing:

3. Blow through the valve from "A", and check to see that it opens at a pressure of 5.39 - 6.87 kPa (0.055 - 0.07 kg/sq cm, 0.78 - 1.00 psi)
4. Remove the pressure gauge, and connect it to the passage to atmosphere.
5. Blow through the valve from "B", and check to see that it opens at a pressure of 0.98 - 4.9 kPa (0.01 - 0.05 kg/sq cm, 0.14 - 0.71 psi).

NOTE: This test should only be performed with the valve held horizontally. Otherwise, the check balls in the valve will close the passages.

Fuel Vapor Separator:

FUEL VAPOR SEPARATOR

1. Lift up the trunk side trim (right side).
2. Remove the cover.
3. Visually check the separator for any signs of damage.
4. Replace if necessary.


SOLENOID VALVE (PURGE CONTROL)

1. Disconnect the vacuum hoses from the solenoid valve.
2. Verify that no air can pass through the solenoid valve.

Fig. 146 Solenoid Test:

3. Disconnect the solenoid valve connector and connect 12V and a ground to the terminals of the solenoid valve.
4. Verify that air can pass through the solenoid valve.
5. If not as specified, replace the solenoid valve.

Fig. 148 Two-Way Check Valve:

TWO-WAY CHECK VALVE

1. Remove the valve.
2. Blow through the valve from "A" and verify that air flows through the valve.
3. Blow through the valve from "B" and verify that air does not flow through the valve.