Valve Test
- Make sure the fuel tank is less than half full.
- Remove the fuel fill cap.
- Remove the fuel hose joint protector. Disconnect the ORVR signal hose.
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- Disconnect the vacuum hose from the EVAP control canister, and then plug the port with plug.
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- Disconnect the vacuum hose from the EVAP control canister vent shut valve, and connect a vacuum pump to the vacuum hose.
- Pump the vacuum pump 80 times.
- If the vacuum holds, go to step 7.
- If the vacuum does not hold, go to step 9.
- Connect a second vacuum pump to the ORVR signal hose.
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- Apply vacuum (1 pump) to the ORVR signal hose, then check the vacuum on the pump in step 6.
- Disconnect the ORVR quick disconnect from the EVAP canister, then plug the port on the canister. Reapply vacuum (80 pumps).
- If the vacuum holds, replace the ORVR vent shut valve (see ORVR VENT SHUT VALVE REPLACEMENT
).
- If the vacuum does not hold, inspect the EVAP canister vent shut valve O-ring. If the O-ring is OK, replace the EVAP canister and repeat step 4.