Evaporative Emissions System: Testing and Inspection
SYSTEM INSPECTIONFig. 117 Solenoid Valve:
NOTE: Check condition of wiring harness and/or vacuum lines and connectors before checking sensors or switches.
1. Warm engine to operating temperature.
2. Run at idle.
3. Disconnect vacuum hose from solenoid valve as shown and verify that no vacuum is felt at valve.
4. If not as specified, check valve.
CHARCOAL CANISTER
Visually inspect canister for signs of damage or cracks. Replace if necessary.
CHECK AND CUT VALVE
Check And Cut Valve Testing:
1. Remove valve.
2. Connect pressure gauge to passage from fuel tank.
3. Blow through valve from "A" and check that it opens at a pressure of 0.92 - 1.2 psi (6.38 - 8.34 kPa, 0.065 - 0.085 kg/sq cm).
4. Remove pressure gauge and connect it to passage to atmosphere.
5. Blow through valve from "B", and check that it opens at a pressure of 0.14 - 0.71 psi (0.98 - 4.9 kPa, 0.01 - 0.05 kg/sq cm).
NOTE: Perform test with valve held horizontally. Otherwise, check balls in valve will close passages.
FUEL VAPOR SEPARATOR
Fig. 119 Separator Inspection:
1. Locate separator in rear wheel well.
2. Remove separator.
3. Visually check for any signs of damage.
4. Replace if necessary.
PURGE CONTROL SOLENOID VALVE
Fig. 118 Solenoid Valve Test:
1. Disconnect vacuum hoses from valve.
2. Verify that no air can pass through.
3. Disconnect valve connector and connect 12V and a ground to valve terminals.
4. Verify that air can pass through.
5. If not as specified, replace valve.
TWO-WAY CHECK VALVE
Fig. 152 Two-Way Valve:
1. Remove check valve.
2. Check valve operation with a vacuum pump.
3. Apply approximately 1.46 inHg (37 mmHg) vacuum at port "A" and verify that air flows through.
4. Apply approximately 1.73 inHg (44 mmHg) vacuum at port "B" and verify that air flows through.
5. Replace valve if not to specification.