Emission Control System: Inspection

INSPECT CHARCOAL CANISTER ASSY
1. Visually check the charcoal canister for cracks or damage.
  
  Fig 1: Checking Charcoal Canister For Cracks Or Damage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect operation of the charcoal canister.
  1. Install the cap to the vent port.
  2. While holding the purge port closed, blow air (1.76 kPa (18 gf/cm² , 0.26 psi)) into the EVAP port. Check that air flows from the air drain port.
    
    Fig 2: Checking Air Flows From Air Drain Port Holding Purge Port Closed
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. While holding the purge port and the air drain port closed, blow air (1.76 kPa (18 gf/cm² , 0.26 psi)) into the EVAP port. Check that air does not flow from the air inlet port.
    
    Fig 3: Checking Air Does Not Flow From Air Inlet Port Holding Purge Port & Air Drain Port Closed
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. While holding the air inlet port closed, apply a vacuum (3.43 kPa (25.7 mmHg, 1.01 in.Hg)) to the purge port. Check that the vacuum does not decrease. Then release the air inlet port and check that the vacuum decreases.
    
    Fig 4: Releasing Air Inlet Port & Checking Vacuum Decreases Holding Air Inlet Port Closed
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. While holding the air inlet port closed, apply vacuum (3.43 kPa (25.7 mmHg, 1.01 in.Hg)) to the EVAP port. Check that air flows into the purge port.
    If the operation is not as specified, replace the charcoal canister assy.
    
    Fig 5: Checking Air Flows Into Purge Port Holding Air Inlet Port Closed
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Remove the hose and cap from the vent port.

INSPECT BY-PASS VSV

Measure the resistance of the VSV.

Standard:

BY-PASS VSV RESISTANCE

Tester Connection	Specified Condition
1 - 2	30 to 36 ohms at 20°C (68°F)
1 - Body ground 2 - Body ground	10 k ohms or higher

If the result is not as specified, replace the VSV.

Fig 6: Measuring Resistance Of VSV

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the operation of the VSV.
1. Check that air does not flow from port E to port F.
  
  Fig 7: Checking If Air Does Not Flow From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage across the terminals.
3. Check that air flows from port E to port F.
  If the result is not as specified, replace the VSV.
  
  Fig 8: Checking Air Flows From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT VENTILATION VALVE SUB-ASSY
1. Install a clean hose to the ventilation valve.
2. Inspect operation of the ventilation valve.
  1. Blow air from the cylinder head side, and check that air passes through easily.
    CAUTION: Do not suck air through the valve. Petroleum substances stuck inside the valve are harmful.
    
    Fig 9: Checking Air Passes Through Easily Blowing Air From Cylinder Head Side
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Blow air from the intake manifold side, and check that air passes through with difficulty.
    If the operation is not as specified, replace the ventilation valve
    
    Fig 10: Checking Air Passes Through With Difficulty Blowing Air From 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/or gasket are deformed or damaged.
  If necessary, repair or replace the cap.
  
  Fig 11: Inspecting Fuel Tank Cap Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT EVAP VSV

Measure the resistance of the VSV.

Standard:

EVAP VSV RESISTANCE

Tester Connection	Specified Condition
1 - 2	27 to 33 ohms at 20°C (68°F)
1 - Body ground 2 - Body ground	10 k ohms or higher

If the result is not as specified, replace the VSV.

Fig 12: Measuring Resistance Of VSV

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check operation of the VSV.
1. Check that air does not flow from port E to port F.
  If the result is not as specified, replace the VSV.
  
  Fig 13: Checking Air Does Not Flow From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage across the terminals.
3. Check that air flow from port E to port F.
  If the result is not as specified, replace the VSV.
  
  Fig 14: Checking Air Flow From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CCV

Measure the resistance of the CCV.

Standard:

CCV RESISTANCE

Tester Connection	Specified Condition
1 - 2	25 to 30 ohms at 20°C (68°F)
1 - Body ground 2 - Body ground	10 k ohms or higher

If the result is not as specified, replace the CCV.

Fig 15: Measuring Resistance Of CCV

Check operation of the CCV.
1. Check that air flows from port A to port B.
  
  Fig 16: Check If Air Flows From Port A To Port B
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage across the terminals.
3. Check that air does not flow from port A to port B.
  If the result is not as specified, replace the CCV.
  
  Fig 17: Checking Air Does Not Flow From Port A To Port B
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002