GSIC - Global Service Information Center

# EMISSION CONTROL SYSTEM > ON-VEHICLE INSPECTION

## for Preparation Click here

1. VISUALLY CHECK HOSES, CONNECTIONS AND GASKETS

1. Check that there are no cracks, leaks or damage.

   NOTICE:
   1. Detachment or other problems with the engine oil dipstick, filler cap, PCV hose and other components may cause the engine to run improperly.
   1. Air suction caused by disconnections, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will cause engine failure or engine malfunctions.
   If the result is not as specified, replace parts as necessary.

2. CHECK VACUUM SWITCHING VALVE (for EVAP)

1. Check that the vacuum hose is connected correctly.

1. Disconnect the vacuum hose from the canister, and connect a vacuum gauge.

1. Using the flowchart below, perform a VSV operation inspection when the engine coolant temperature is 55°C (131°F) or less (while the engine is cold (VSV is closed)).

   HINT:
     The ECM turns the VSV off so that the route between the canister and intake manifold is closed, and fuel vapor in the canister is not purged to the intake manifold.

   1. VSV operation flowchart.
      1. When engine is idling or running and at 2,500 rpm, the vacuum gauge indicates 1 kPa (25 mmHg, 0.3 in.Hg) or less.

      Result:

        Result | Procedure
        Yes | VSV operation normal
        No | Go to next step

      2. Inspect the VSV (Click here).

      Result:

        Result | Procedure
        OK | Check wire harness and ECM
        NG | Replace VSV

1. Using the flowchart below, perform a VSV operation inspection when the engine coolant temperature is 80°C (146°F) or more (while the engine is hot (VSV is opened)).

   HINT:
     The ECM turns the VSV on so that a vacuum is created in the intake manifold and the canister's fuel vapors are purged to the intake manifold.

   1. VSV operation flowchart.
      1. When engine is idling, the vacuum gauge indicates 40 kPa (300 mmHg, 11.8 in.Hg) or more.

      Result:

        Result | Procedure
        Yes | VSV operation normal
        No | Go to next step

      2. Inspect the VSV (Click here).

      Result:

        Result | Procedure
        OK | Check wire harness and ECM
        NG | Replace VSV