EMISSION CONTROL SYSTEM ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT FUEL CUT-OFF RPM

   
   

   1. Start and warm up the engine.

   2. Open the throttle valve and keep the engine speed at 3000 rpm.

   3. Use a sound scope to check for injector operating sounds.

   4. Check that when the accelerator pedal is released, injector operating noise stops momentarily and then resumes.

      If the result is as not specified, check the injector, wiring and ECM.

2. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS

   
   

   1. 

      Check for cracks, leaks or damage.

      
      

      1. Check the engine assembly.

         Tech Tips

         Detachment or other problems with the engine oil dipstick, filler cap and other components loose parts may cause the engine to run improperly.

         If any defects are found, replace the parts as necessary.

3. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM

   
   

   1. Start the engine.

   2. 

      Disconnect the vacuum hose as shown in the illustration.

   3. Connect the intelligent tester to the DLC3.

   4. Turn the tester on.

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

   6. Check that a vacuum occurs at the VSV port.

   7. Exit the Active Test mode and reconnect the vacuum hose.

   8. Enter the following menus: Powertrain / Engine and ECT / Data List / EVAP Purge VSV.

   9. Warm up the engine and drive the vehicle.

   10. Confirm that the purge VSV opens.

       If the result is not as specified, replace the VSV, wire harness or ECM.

4. INSPECT EGR SYSTEM

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the intelligent tester on.

   4. Start the engine.

   5. Enter the following menus: Powertrain / Engine and ECT / Active test / Control the EGR Step Position.

   6. Check the engine speed when the EGR valve is operated by the intelligent tester.

   7. Perform the Active Test by referring to the table below.

      Tech Tips

      Test is possible with vehicle stopped and engine idling.

      OK
      Condition Specified Condition Open the EGR valve gradually (Increase number of steps) As the valve opens, engine changes from steady idling to rough idling Close the EGR valve gradually (Decrease number of steps) As the valve closed, engine changes from rough idling to steady idling

5. INSPECT CHARCOAL CANISTER

   
   

   1. Check for clogs in the air filter (when not using the intelligent tester).

      
      

      1. Start the engine.

      2. Warm up the engine.

      3. Allow the engine to idle after the engine has warmed up.

      4. After 15 minutes, open the fuel tank cap to discharge the pressure in the fuel tank.

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

      6. 

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

         Standard
         No whooshing sounds (inhalation sound) are heard.

         Tech Tips

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

   2. Check for clogs in the air filter (when using the intelligent tester).

      
      

      1. Connect the intelligent tester to the DLC3.

      2. Start the engine.

      3. Turn the intelligent tester on.

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

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

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

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

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

         OK
         No whooshing sounds (inhalation sound) are heard.

         Tech Tips

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