Emission Control Systems: Testing and Inspection

2ZR-FXE EMISSION CONTROL: EMISSION CONTROL SYSTEM: ON-VEHICLE INSPECTION

1. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS

(a) Inspect the hoses and gaskets for scratches, cracks or air/oil leaks from the connecting parts.

HINT
If the hoses or gaskets are damaged or some of the connections are loose, they may cause an engine stall or malfunction.

2. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM

(a) Connect the Techstream to the DLC3.

(b) Disconnect the fuel vapor feed hose from the vacuum switching valve assembly shown in the illustration.





(c) Put the engine in inspection mode Check Mode Procedure.

(d) Start the engine.

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

(f) Check that vacuum occurs at the purge VSV port.

(g) If vacuum does not occur, check the following items.

HINT
* Purge VSV (for canister purge)
* Clogging in the fuel vapor feed hose connecting the intake manifold and purge VSV
* Voltage from the ECM PRG terminal Pinout Values and Diagnostic Parameters

(h) Exit Active Test mode and reconnect the fuel vapor feed hose.

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

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

(k) Confirm that the purge valve opens.

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

3. CHECK FUEL TANK AND VENT LINE

(a) Disconnect the vent line tube from the charcoal canister assembly.

(b) Connect a pressure gauge to the vent line tube.





Text in Illustration





(c) Apply 4 kPa (0.04 kgf/cm2, 0.6 psi) of pressure to the vent line of the fuel tank.

HINT
Perform this inspection with the fuel tank less than 90% full. When the fuel tank is full, the fuel fill check valve closes and the pressure is released through the 2 mm orifice. As a result, when the fuel tank cap is removed, the pressure does not decrease smoothly.

(d) Check that the fuel tank pressure is maintained for some time, and does not decrease immediately.

HINT
If the pressure decreases immediately, one of the following may apply:

* The fuel tank cap is not completely tightened.
* The fuel tank cap is damaged.
* Air is leaking from the vent line.
* The fuel tank is damaged.

(e) When the fuel tank cap is removed, check that the pressure is released smoothly.

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

(f) Reconnect the vent line tube to the charcoal canister assembly.

4. INSPECT AIR LINE

(a) Disconnect the air line tube from the charcoal canister with bracket assembly.





Text in Illustration





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

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

(c) Reconnect the air line tube to the charcoal canister with bracket assembly.