Section 714 (Emission Control System (3MZ-FE)): Inspection

WARNING: This page is about a different car, the 2004 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.

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 dangerous to your health.
    
    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 the result is not as specified, replace the ventilation valve.
  
  Fig 2: Blowing Air Into Intake Manifold Side
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Remove the clean hose from the ventilation valve.
INSPECT FUEL TANK CAP ASSY
1. Visually check if the cap and gasket are deformed or damaged.
Fig 3: Inspecting Fuel Tank Cap Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CHARCOAL CANISTER ASSY

Visually check the charcoal canister for cracking or damage.
If cracking or damage is found, replace the charcoal canister assy.

Fig 4: Checking Charcoal Canister For Cracking Or Damage
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.
  
  Fig 5: Blowing Air Into Vent Port Holding Purge Port Closed
  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.
  
  Fig 6: Blowing Air Into Vent Port Holding Air Inlet Port Closed
  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 into the purge port.
If the result is not as specified, replace the charcoal canister.

Fig 7: Checking That Air Is Sucked Into Purge Port
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
  
  Fig 8: Applying Vacuum To Purge Port Holding Vent & Air Inlet Ports Closed
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:

In order to maintain air tightness, the check should be performed while holding the VSV terminal port closed.

If the result is not as specified, replace the charcoal canister.
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: Applying Vacuum Into Port A Holding Vent, Purge & Air Inlet Ports Closed
  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 the vacuum pressure to decrease.
  Vacuum pressure decrease time: 10 seconds or more
  
  If the result is not as specified, replace the charcoal canister.
  
  Fig 10: Applying Vacuum Into Port A Holding Vent, Purge & Air Inlet Ports Closed
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Reinstall the air hose between ports A and B.

Check if the VSV has an open circuit.

Measure the resistance between the terminals.

Standard:

RESISTANCE CHECK

Condition	Specified Condition
20°C (68°F)	25 to 30 Ω
100°C (212°F)	32 to 40 Ω

If the result is not as specified, replace the charcoal canister.

Fig 11: Checking VSV For Open Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check VSV operation.
1. Check that air flows from port A to ports B and C.
  If the result is not as specified, replace the charcoal canister.
  
  Fig 12: Checking Air Flows From Port A To Ports B & C
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery positive voltage across the terminals.
  
  Fig 13: Applying Battery Voltage Across Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check that the valve closes.
  If the result is not as specified, replace the charcoal canister.
4. Check that air does not flow from port A to port B.
  
  Fig 14: Checking Air Does Not Flow From Port A To Port B
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Check that air flows from port A to port C.
If the result is not as specified, replace the charcoal canister.

INSPECT VACUUM SWITCHING VALVE ASSY FOR EVAP

Check the VSV for open circuit.

Measure the resistance.

Standard:

RESISTANCE CHECK

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

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

Fig 15: Checking VSV For Open Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check VSV operation.
1. Check that air does not flow from the port as shown in Fig 16 .
  
  Fig 16: Checking Air Does 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 port as shown in Fig 17 .
If the result is not as specified, replace the VSV assy.