CANISTER ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT CANISTER (FUEL SUCTION TUBE ASSEMBLY) (for Fuel Tank Cap Method)

   1. Inspect evaporative emission control system.

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   2. Check for clogs in the air filter (when not using the GTS).

      1. Start the engine.

      2. Warm up the engine.

      3. Allow the engine to idle for 15 minutes.

      4. Open the fuel tank cap assembly to discharge the pressure in the fuel tank assembly.

      5. Close the fuel tank cap assembly and allow the engine to idle for 30 seconds.

      6. 

         Open the fuel tank cap assembly again and check for inhalation sounds.

         OK

         No whooshing sounds (inhalation sound) are heard.

         Tip:

         If there is a smell of gasoline and a whooshing sound (exhalation sound) is heard, positive pressure in the fuel tank assembly is being discharged. This does not indicate a malfunction.

   3. Check for clogs in the air filter (when using the GTS).

      1. Connect the GTS to the DLC3.

      2. Start the engine.

      3. Turn the GTS on.

      4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.

         Powertrain > Engine and ECT > Active Test

         Tester Display
         Activate the VSV for Evap Control

      5. Open the fuel tank cap assembly to discharge the pressure in the fuel tank assembly.

      6. Perform the Active Test "Activate the VSV for Evap Control" while the engine is idling.

      7. Close the fuel tank cap assembly and allow the engine to idle for 30 seconds.

      8. Open the fuel tank cap assembly again and check for inhalation sounds.

         OK

         No whooshing sounds (inhalation sound) are heard.

         Tip:

         If there is a smell of gasoline and a whooshing sound (exhalation sound) is heard, positive pressure in the fuel tank assembly is being discharged. This does not indicate a malfunction.

2. INSPECT CANISTER (FUEL SUCTION TUBE ASSEMBLY) (for Vacuum Measurement Method)

   1. Visually check the canister (fuel suction tube assembly) for airtightness.

      1. Visually check the canister (fuel suction tube assembly) for cracks or damage, and check that there is no gasoline smell.

   2. Visually check the charcoal canister filter sub-assembly.

      1. 

         *1	Charcoal Canister Filter Sub-assembly

         Remove the charcoal canister filter sub-assembly.

      2. Visually check if the charcoal canister filter is excessively damaged or dirty.

   3. Inspect the ventilation of the canister (fuel suction tube assembly).

      Note:

      When inspecting with parts installed to the vehicle, be sure to remove the fuel tank cap assembly.

      1. 

         *a	Port (A)
         *b	Port (B)
         *c	Air

         Apply compressed air to the port (A) and check that the air flows out from the port (B).

         OK

         The air flows out from the port (B).

      2. 

         *a	Port (A)
         *b	Port (B)
         *c	Air

         Apply compressed air to the port (B) and check that the air flows out from the port (A).

         OK

         The air flows out from the port (A).

   4. Inspect the check valve.

      Note:

      When inspecting with parts installed to the vehicle, be sure to remove the fuel tank cap assembly.

      1. 

         *a	Port (A)
         *b	Port (B)
         *c	Air

         Apply compressed air to the port (A) with the port (B) closed.

         OK

         Air does not flow at first. By gradually increasing the pressure, air flows when the pressure in the port reaches a certain level.

      2. 

         *a	Port (A)
         *b	Port (B)
         *c	Vacuum Pump

         Using a vacuum pump, apply vacuum to the port (A) with the port (B) closed.

         OK

         The vacuum is maintained at first. By gradually increasing the vacuum, air flows and the vacuum decreases after the vacuum reaches a certain level.

   5. 

      *1	Fuel Hose
      *a	3-way Connector
      *b	Hose
      *c	Vacuum Pump

      Check for clogs in the air filter (when not using the GTS).

      1. Connect the fuel hose to the canister (fuel suction tube assembly) via the 3-way connector, hose and vacuum pump as shown in the illustration.

      2. Start the engine.

      3. Warm up the engine.

      4. Allow the engine to idle for 15 minutes.

      5. Check the indicator needle of the vacuum pump.

         OK

         The indicator needle of the vacuum pump does not rise from its initial position.

         Tip:

         The indicator needle may shake due to engine vibration, etc., but if it immediately returns to its initial position, there is no problem.

   6. 

      *1	Fuel Hose
      *a	3-way Connector
      *b	Hose
      *c	Vacuum Pump

      Check for clogs in the air filter (when using the GTS).

      1. Connect the fuel hose to the canister (fuel suction tube assembly) via the 3-way connector, hose and vacuum pump as shown in the illustration.

      2. Connect the GTS to the DLC3.

      3. Start the engine.

      4. Turn the GTS on.

      5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.

         Powertrain > Engine and ECT > Active Test

         Tester Display
         Activate the VSV for Evap Control

      6. Perform the Active Test "Activate the VSV for Evap Control" while the engine is idling.

      7. Check the indicator needle of the vacuum pump.

         OK

         The indicator needle of the vacuum pump does not rise from its initial position.

         Tip:

         The indicator needle may shake due to engine vibration, etc., but if it immediately returns to its initial position, there is no problem.