Emission Control Systems: Testing and Inspection
2AR-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) Put the engine in inspection mode (maintenance mode) Component Tests and General Diagnostics.
(c) Start the engine and disconnect the fuel vapor feed hose from the purge VSV.
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NOTICE:
* Remove any dirt or foreign matter on the fuel tube connector before performing this work.
* Do not allow any scratches or foreign matter to get on the parts when disconnecting them as the fuel tube connector has an O-ring that seals the pipe.
* Perform this work by hand. Do not use any tools.
* Protect the disconnected parts by covering them with plastic bags after disconnecting the fuel vapor feed hose.
(d) Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for Evap Control.
(e) Check that vacuum occurs at the purge VSV port.
(f) If vacuum does not occur, check the following items:
* Purge VSV (for canister purge)
* Clogs in the fuel vapor feed hose connecting the intake air surge tank and purge VSV
* Voltage from the ECM PRG terminal Pinout Values and Diagnostic Parameters
(g) Exit Active Test mode and reconnect the fuel vapor feed hose.
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NOTICE:
* Check that there are no scratches or foreign matter around the connected part of the fuel tube connector and pipe before performing this work.
* Connect the quick connector and push the retainer in until the retainer makes a "click" sound to lock the claws of the retainer.
* After connecting the fuel vapor feed hose to the fuel tube connector, check that the fuel vapor feed hose is securely connected by pulling on the fuel tube connector and the fuel vapor feed hose.
(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 canister.
(b) Connect a pressure gauge to the vent line tube.
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(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 cut-off 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 canister.
4. INSPECT AIR LINE
(a) Disconnect the air line tube from the charcoal canister assembly.
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(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 assembly.