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 the charcoal canister operation.
  1. Plug the vent port with the cap.
  2. While holding the purge port closed, blow air (1.76 kPa, 18 gf/cm² , 0.26 psi) into the EVAP port to check that air flows from the air drain port.
    
    Fig 2: Checking Air Flows From Air Drain Port
    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 to check that air does not flow from the air inlet port.
    
    Fig 3: Checking Air Does Not Flow From Air Inlet Port
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Apply a vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the purge port, check that the vacuum does not decrease when the air inlet port is closed, and check that the vacuum decreases when the air inlet port is released.
    If the result is not as specified, replace the charcoal canister assy.
    
    Fig 4: Applying Vacuum To Purge Port
    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 and check that air flows into the purge port.
    If result is not as specified, replace the charcoal canister.
  6. Remove the cap from vent port.
    
    Fig 5: Checking Air Flows Into Purge Port
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT VACUUM SWITCHING VALVE ASSY FOR ACIS

Measure the VSV resistance.

Fig 6: Measuring VSV Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

STANDARD:

VACUUM SWITCHING VALVE ASSY FOR ACIS

Tester Connection	Specified Condition
1 - 2	33 to 39 Ω at 20°C (68°F)
1 - Body ground 2 - Body ground	10 kΩ or higher

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

Check VSV operation.

Check that air does not flow from port E to port F.
If the result is not as specified, replace the VSV assy.

Fig 7: Checking VSV Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Apply battery positive voltage across the terminals.
Check that air flows from port E to port F.

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

Fig 8: Checking Air Flows From Port E To Port F

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT VACUUM SWITCHING VALVE ASSY FOR PRESSURE SWITCHING VALVE

Measure the VSV resistance.

Fig 9: Measuring VSV Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

VACUUM SWITCHING VALVE ASSY FOR PRESSURE SWITCHING VALVE

Tester Connection	Specified Condition
1 - 2	37 to 44 Ω at 20°C (68°F)
1 - Body ground 2 - Body ground	10 kΩ or higher

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

Check VSV operation.

Check that air does not flow from port E to port F.

Fig 10: Checking Air Does Not Flow From Port E To Port F
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Apply battery positive voltage across the terminals.
Check that air flows from port E to port F.

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

Fig 11: 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.
  
  Fig 12: Installing Clean Hose To Ventilation Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect ventilation valve operation.
  1. Blow air from the cylinder head side of the engine, and check that air passes through easily.
    CAUTION: Do not suck air through the valve. Petroleum substances stuck to the valve is harmful.
  2. Blow air from the intake manifold side of the engine, and check that air passes through with difficulty.
  If the result is not as specified, replace the ventilation valve.
  
  Fig 13: Checking Air Passes Through With Difficulty
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Remove the clean hose from the ventilation valve.
INSPECT FUEL TANK CAP ASSY
1. Visually check if cap and/or gasket are deformed or damaged.
If necessary, repair or replace the cap.

Fig 14: Identifying Fuel Tank Cap Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT VACUUM SWITCHING VALVE ASSY FOR EVAP

Measure the VSV resistance.

Fig 15: Measuring VSV Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

VACUUM SWITCHING VALVE ASSY FOR EVAP

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

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

Check VSV operation.

Check that air does not flow from port E to port F.
If the result is not as specified, replace the VSV assy.

Fig 16: Checking Air Does Not Flow From Port E to Port F
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Apply battery positive voltage across the terminals.
Check that air flows from port E to port F.

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

Fig 17: Checking Air Flows From Port E To Port F

INSPECT VACUUM SWITCHING VALVE ASSY FOR CCV

Measure the VSV resistance.

Fig 18: Measuring VSV Resistance

Standard:

VACUUM SWITCHING VALVE ASSY FOR CCV

1 - 2	25 to 30 Ω at 20°C (68°F)
1 - Body ground 2 - Body ground	10 kΩ or higher

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

Check VSV operation.

Check that air flows from port A to port B.

Fig 19: Checking Air Flows From Port A To Port B
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Apply battery positive voltage across the terminals.
Check that air does not flow from port A to port B.

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

Fig 20: Checking Air Does Not Flow From Port A To Port B