Emission Control System (W/O Secondary Air Injection System) On-Vehicle Inspection

Visually check that the hoses, connections and gaskets have 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.
   

Check that the vacuum hose is connected correctly.

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

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

HINT:

The ECM turns the purge 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. Purge VSV operation inspection procedure.
   

   1. When the engine is idling or running at 2500 rpm, the vacuum gauge indicates 1 kPa (25 mmHg, 0.295 in.Hg) or less.
      

      Result:

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

   2. Inspect the purge VSV (HILUX_TGN26 RM00000142600ZX.html).
      

      Result:

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

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

HINT:

The ECM turns the purge 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. Purge VSV operation inspection procedure.
   

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

      Result:

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

   2. Inspect the purge VSV (HILUX_TGN26 RM00000142600ZX.html).
      

      Result:

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