Evaporative Emission (EVAP) Canister Purge System Inspection

CAUTION: Refer to Fuel Vapors in Evaporative Emission (EVAP) Components Caution in Service Precautions.

IMPORTANT:
^ Perform a careful visual inspection of the Evaporative Emission (EVAP) control system components and the connecting hoses before diagnosis of an EVAP system malfunction.
^ The EVAP canister purge system does not perform purging unless the engine is sufficiently warmed up and the Heated Oxygen Sensor (HO2S) is fully activated.

Failure of the EVAP canister purge system to pass any of the above checks indicates a possible malfunction that will require further inspection.
1. Allow the engine to cool to room temperature.
2. Start the engine.
3. Disconnect the purge hose from the EVAP canister.
4. Place a finger against the end of the disconnected hose and check for vacuum. Vacuum should not be felt when the engine coolant temperature is less than the normal operating temperature.
5. Connect the purge hose to the EVAP canister and warm the engine up to a normal operating temperature.
6. Disconnect the purge hose from the EVAP canister.
7. Place a finger over the disconnected hose and check for vacuum. Vacuum should be felt with the engine running at a normal operating temperature and at 1,500 RPM.