Section 7 (Emission Control System (2AZ-FE)): Inspection

WARNING: This page is about a different variant/trim than selected.

INSPECT VENTILATION VALVE SUB-ASSY
1. Install a clean hose to the ventilation valve.
2. Check ventilation valve operation.
  1. Blow air into the cylinder head side, and check that air passes through easily.
    CAUTION: Do not suck air through the valve. Petroleum substances inside the valve are harmful.
    
    Fig 1: Blowing Air Into Cylinder Head Side
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Blow air into the intake manifold side, and check that air passes through with difficulty.
  If operation is not as specified, replace the ventilation valve.
3. Remove the hose from the ventilation valve.
Fig 2: Blowing Air Into Intake Manifold Side
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FUEL TANK CAP ASSY
1. Visually check if the cap and gasket are deformed or damaged.
If necessary, repair or replace the cap and/or gasket.

Fig 3: Inspecting Fuel Tank Cap Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT CHARCOAL CANISTER ASSY
1. Visually check the charcoal canister for cracks or damage.
If cracks or damage is found, replace the charcoal canister assy.

Fig 4: Inspecting Charcoal Canister Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check charcoal canister operation.
1. While holding the purge port closed, blow air (0.39 kPa, 4.0 gf/cm² , 0.06 psi) into the vent port, and check that air flows from the air inlet port.
  If the result is not as specified, replace the charcoal canister assy.
  
  Fig 5: Checking Air Flows From Air Inlet Port
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. While holding the air inlet port closed, blow air (0.39 kPa, 4.0 gf/cm² , 0.06 psi) into the vent port, and check that air flows from the purge port.
  If the result is not as specified, replace the charcoal canister assy.
  
  Fig 6: Checking Air Flows From Purge Port
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. While holding the air inlet port closed, apply vacuum (3.43 kPa, 25.7 gf/cm² , 1.01 psi) to the vent port, and check that air is sucked in from the purge port.
  If the result is not as specified, replace the charcoal canister assy.
  
  Fig 7: Checking Air Sucked From Purge Port
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the air tightness.
  1. While holding the vent and air inlet ports closed, apply vacuum (3.43 kPa, 25.7 gf/cm² ,1.01 psi) to the purge port, and check that the vacuum is maintained for 1 minute.
  HINT:
  
  In order to maintain air tightness, the check should be performed while holding the CCV terminal port closed. If the result is not as specified, replace the charcoal canister assy.
  
  Fig 8: Checking Air Tightness
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Check the diaphragm.
  1. Remove the air hose between ports A and B.
  2. While holding the vent, purge and air inlet ports closed, apply vacuum (1.42 kPa, 11 mmHg, 0.42 in.Hg) into port A, and check that air is sucked in from port B.
    
    Fig 9: Checking Diaphragm
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. While holding the vent, purge and air inlet ports closed, apply vacuum (1.42 kPa, 11 mmHg, 0.42 in.Hg) into port A, and measure how long it takes for vacuum to drop.
    1. Vacuum drop time: 10 seconds or more
    If the result is not as specified, replace the charcoal canister assy.
  4. Reinstall the air hose between ports A and B.
  Fig 10: Applying Vacuum Into Port
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Check pump module operation.
  1. Check that air flows from port A to ports B and C.
    If the result is not as specified, replace the pump module.
    
    Fig 11: Checking Air Flows From Port A To Ports B And C
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Apply battery positive voltage across the terminals.
  3. Check that the valve is closed.
    If the result is not as specified, replace the pump module.
    
    Fig 12: Applying Battery Positive Voltage Across Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Check that air does not flow from port A to port B.
  5. Check that air flows from port A to port C.
If the result is not as specified, replace the pump module.

Fig 13: Checking Air Does Not Flow From Port A To Port B
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT VACUUM SWITCHING VALVE ASSY FOR EVAP

Measure the VSV resistance between the terminals.

Standard:

SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
1-2	26 to 30 Ω at 20° C (68° F)
1 - Body ground 2 - Body ground	10 MΩ or higher

If the resistance is not as specified, replace the VSV assy.

Fig 14: Measuring VSV Resistance Between Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check VSV operation.
1. Check that air does not flow from the port as shown in the illustration.
  If the result is not as specified, replace the VSV assy.
  
  Fig 15: Checking Air Not Flow From Port
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery positive voltage across the terminals.
3. Check that air flows from the ports.