Evaporative Emission Control Canister: Testing and Inspection

INSPECT CHARCOAL CANISTER ASSEMBLY




a. Visually check the charcoal canister for cracks or damage.
b. Inspect the charcoal canister operation.




1. Plug the vent port with a 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 inlet port.
3. Plug the air inlet port with your finger.




4. Apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg), check that the vacuum decreases when the air inlet port is opened.




5. While holding the air inlet port closed, apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the EVAP port and check that air flows into the purge port.
If a problem is found, replace the charcoal canister.

6. Remove the cap from the vent port.







c. Inspect the VSV for open circuit.
1. Using an Ohmmeter, check the resistance between the terminals.
If the resistance is not as specified, replace the VSV.




d. Inspect the VSV for ground.
1. Using an ohmmeter, check that there is no continuity between each terminal and the body.
If there is continuity, replace the VSV.




e. Inspect the VSV operation.
1. Check that air flows from port A to port B.




2. Apply battery positive voltage across the terminals.
3. Check that air does not flow from port A to port B.
If operation is not as specified, replace the VSV.