Emission Control Systems: Testing and Inspection

2AZ-FE EMISSION CONTROL: EMISSION CONTROL SYSTEM: ON-VEHICLE INSPECTION

1. CHECK FUEL CUT-OFF RPM

(a) Increase the engine speed to at least 3,500 rpm.

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

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

2. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS

(a) Check that there are no cracks, leakage or scratches on the hoses, connections or gaskets.





NOTICE:
* Removing the oil level dipstick, oil filter cap or PCV hose may cause the engine to malfunction or stall.
* Disconnections, looseness or cracks in the parts of the air induction system between the intake system and cylinder head will allow air suction and cause the engine to run improperly.

If the result is not as specified, replace parts as necessary.

3. CHECK LINE AND CONNECTORS

(a) Visually check for loose connections, sharp bends and damage.

4. CHECK FUEL TANK ASSEMBLY

(a) Visually check for deformation, cracks and fuel leaks.

5. CHECK FUEL TANK AND VENT LINE





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

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

(c) Apply 4 kPa (0.04 kgf/cm2, 30 mmHg) of pressure to the fuel tank vent line.

HINT
Perform this inspection with the fuel tank less than 90% full. When the fuel tank is full, the fuel cutoff valve closes and pressure is released through the 1.5 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 canister.

6. CHECK AIR INLET LINE

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

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

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

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