Emission Control Systems: Testing and Inspection

1AR-FE EMISSION CONTROL: EMISSION CONTROL SYSTEM: ON-VEHICLE INSPECTION

1. CHECK FUEL CUT RPM

(a) Increase the engine speed to at least 3500 rpm.

(b) Use a sound scope to check for injector operating noise.





Text in Illustration





(c) Check that the operating sounds stop momentarily and then resume when the accelerator pedal is released.

HINT
Measure with the A/C off.

Fuel return rpm:

1400 rpm

2. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS

(a) Visually check that the hoses, connections and gaskets have no cracks, leaks or damage.





NOTICE:
* Detachment or other problems with the engine oil dipstick, filler cap, PCV hose and other components may cause the engine to run improperly.
* Disconnection, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will allow air suction and cause an engine failure or engine malfunctions.

If any defects are found, replace parts as necessary.

3. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM

(a) Start the engine.

(b) Disconnect the vacuum hose shown in the illustration.





(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

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

(g) Check that vacuum occurs at the VSV port.

(h) Exit Active Test mode and reconnect the vacuum hose.

(i) Enter the following menus: Powertrain / Engine / Data List / EVAP Purge VSV.

(j) Warm up the engine and drive the vehicle.

(k) Confirm that the purge VSV opens.

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

4. INSPECT FUEL CUT-OFF VALVE AND FILL CHECK VALVE

(a) Disconnect the vent line hose from the canister.





Text in Illustration





(b) Connect a pressure gauge to the vent hose.

(c) Fill the fuel tank with fuel.

(d) Apply pressure of 4 kPa (0.04 kgf/cm2, 0.58 psi) to the vent line hose (to fuel tank).

HINT
It is necessary to check the amount of fuel in the fuel tank. When the fuel tank is full, the float valve of the fill check valve is closed and no air can pass through.

(e) Remove the fuel tank cap, and check that the pressure drops.

If the pressure does not drop, replace the fuel tank assembly.

(f) Reconnect the vent line hose to the canister.

5. INSPECT AIR INLET LINE

(a) Disconnect the air inlet line hose from the charcoal canister.





Text in Illustration





(b) Check that air flows freely into the air inlet line.

If air does not flow freely into the air inlet line, repair or replace the air inlet line hose.

(c) Reconnect the air inlet line hose to the charcoal canister.