Evaporative Emission Control Canister: Testing and Inspection

INSPECTION


CHARCOAL CANISTER ASSY




a. Visually check the charcoal canister for cracks or damage.

b. Inspect the charcoal canister operation.




1. Plug the vent port with the cap.
2. While holding the purge port closed, blow air (1.76 kPa, 18 gf/sq.cm, 0.26 psi) into the EVAP port and check that air flows from the air drain port.




3. While holding the purge port and the air drain port closed, blow air (1.76 kPa, 18 gf/sq.cm, 0.26 psi) into the EVAP port and check that air does not flow from the air inlet port.




4. Apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the purge port, check that the vacuum does not decrease when the air inlet port is closed, and check that the vacuum decreases when the air inlet port is released.




5. While holding the air inlet port closed, apply vacuum (3.43 kPa, 25.7 mm Hg, 1.01 in.Hg) to the EVAP port and check that air flows into the purge port.
If operation is not as specified, replace the charcoal canister.

6. Remove the hose and cap from vent port.

c. Inspect VSV for pressure switching valve




1. Using an ohmmeter, check that there is continuity between the terminals.

Resistance:
37 - 44 Ohms at 20 °C (68 °F)
51 - 62 Ohms at 120 °C (248 °F)

If there is no continuity, replace the VSV.




2. Using an ohmmeter, check that there is no continuity between each terminal and the body.
If there is continuity, replace the VSV.




3. Check that air does not flow from ports E to F.




4. Apply battery positive voltage across the terminals.
5. Check that air flows from ports E to F.
If operation is not as specified, replace the VSV.