Section 643 (Emission Control System (2AZ-FE)): Inspection

WARNING: This page is about a different car, the 2004 Toyota Camry. 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 air passes through easily.
    CAUTION: Do not suck air through the valve. Petroleum substances inside the valve are harmful.
    
    Fig 1: Checking Ventilation Valve Operation
    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 clean hose from the ventilation valve.
  
  Fig 2: Checking Air Passes Through Ventilation Valve With Difficulty From 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.
  
  Fig 3: Identifying Fuel Tank Cap Gasket
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CHARCOAL CANISTER ASSY (Except PZEV)

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

Fig 4: Checking Charcoal Canister For Cracks 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: Checking Air Flows From Air Inlet Port While 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: Checking That Air Flows From Purge Port While 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 in from the purge port.
  If the result is not as specified, replace the charcoal canister.
  
  Fig 7: Checking Air Is Sucked In From Purge Port While Holding Air Inlet Port Closed
  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.
  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.
  
  Fig 8: Checking Air Tightness Of Charcoal Canister
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 Air Is Sucked In From Port B
  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.
  Vacuum drop time: 10 seconds or more
  
  If the result is not as specified, replace the charcoal canister.
4. Reinstall the air hose between ports A and B.
  
  Fig 10: Checking Vacuum Drop Time
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the VSV for open circuit.

Measure the resistance between the terminals.

Standard:

VSV TERMINAL RESISTANCE SPECIFICATION

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

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

Fig 11: Measuring Resistance Between VSV Terminals

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 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 charcoal canister.
  
  NOTE: Incorrect electrode connection causes damage to the VSV. Pay due attention when connecting the lead wire.
  
  Fig 13: Checking Valve Closed
  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 charcoal canister.
  
  NOTE: Incorrect electrode connection causes damage to the VSV. Pay due attention when connecting the lead wire.
  
  Fig 14: Checking Air Does Not Flow From Port A To Port B And Flows From Port A To Port C
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CHARCOAL CANISTER ASSY (PZEV)

Visually check the charcoal canister for cracks or damage.

Fig 15: Checking Charcoal Canister For Cracks Or Damage
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Inspect the 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 line port.
  
  Fig 16: Checking Air Flows From Air Line Port While Holding Purge Port Closed
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. While holding the air line 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.
  
  Fig 17: Checking Air Flows From Purge Port While Holding Air Line Port Closed
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. While holding the air line 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 operation is not as specified, replace the charcoal canister.
  
  Fig 18: Checking Air Is Sucked In From Purge Port While Holding Air Line Port Closed
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Inspect air tightness.
1. While holding the vent and air line 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, this check should be performed with the CCV terminal port held closed by your fingers. If operation is not as specified, replace the charcoal canister.
  
  Fig 19: Inspecting Air Tightness Of Charcoal Canister
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Inspect the diaphragm.
1. Remove the air hose between ports A and B.
2. While holding the vent, purge and air line 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 20: Checking Air Is Sucked In From Port B While Holding Vent, Purge And Air Line Ports Closed
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. While holding the vent, purge and air line 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.
  Vacuum drop time: 10 sec. or more
  
  If operation is not as specified, replace the charcoal canister.
4. Reinstall the air hose between ports A and B.
  
  Fig 21: Measuring Vacuum Drop Time
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the VSV for open circuit.

Measure the resistance between the terminals.

Standard:

VSV TERMINALS RESISTANCE SPECIFICATION

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

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

Fig 22: Measuring VSV Terminals Resistance

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 23: 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.
  
  Fig 24: Applying Battery Positive Voltage Across VSV Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check that the valve is closed.
  If the result is not as specified, replace the charcoal canister.
  
  NOTE: Incorrect electrode connection causes damage to the VSV. Pay due attention when connecting the lead wire.
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 charcoal canister.
  
  NOTE: Incorrect electrode connection causes damage to the VSV. Pay due attention when connecting the lead wire.
  
  Fig 25: Checking Air Does Not Flow From Port A To Port B And Flows From Port A To Port C
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT VACUUM SWITCHING VALVE ASSY FOR EVAP
1. Check the VSV for open circuit.
  1. Measure the resistance.
    
    Fig 26: Vacuum Switching Valve Resistance Specification
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the resistance is not as specified, replace the VSV assy.
    
    Fig 27: Measuring Vacuum Switching Valve Resistance Between Terminals & Terminals To Body Ground
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check VSV operation.
  1. Check that air does not flow from the port as shown in the illustration.
    
    Fig 28: 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 ports.
    If the result is not as specified, replace the VSV assy.
    
    Fig 29: Checking Air Flows From Ports
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002