Emission Control System: Inspection

INSPECT CHARCOAL CANISTER ASSY
1. Visually check the charcoal canister for cracks or damage.
  If cracks or damage are found, replace the canister.
  
  Fig 1: Inspecting Charcoal Canister Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check canister operation.
  1. With the purge port closed, blow 0.39 kPa (4.0 kgf/cm² , 0.06 psi) of air into the vent port, and check that air flows from the air inlet port.
    If the result is not as specified, replace the canister.
    
    Fig 2: Checking Canister Operation
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. With the vent port closed, blow 0.39 kPa (0.0039 kgf/cm² , 0.05 psi) of air into the air inlet port, and check that air flows from the purge port.
    If the result is not as specified, replace the canister.
    
    Fig 3: Checking That Air Flows From Purge Port
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the air tightness.
  1. While holding the vent and air inlet ports closed, apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the purge port, and check that the vacuum is maintained for 1 minute.
  If the result is not as specified, replace the charcoal canister assy.
  
  Fig 4: Checking Air Tightness
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the leak detection pump.
  1. Remove the detection pump from the canister.
  2. Check that air flows from port A to B and then to C.
    If the result is not as specified, replace the canister.
    
    Fig 5: Checking Leak Detection Pump
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Connect the positive (+) lead of the battery to terminal 7 and the negative (-) lead to terminal 6.
  4. Check that the valve is closed. If the result is not as specified, replace the canister.
  5. Install the detection pump.
    
    Fig 6: Checking Valve Closed
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT VACUUM SWITCHING VALVE ASSY FOR ACIS

Measure the VSV resistance.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

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.

Fig 7: Measuring VSV Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check VSV operation.
1. Check that air does not flow from port E to port F.
  If the result is not as specified, replace the VSV assy.
  
  Fig 8: Checking Air Does Not Flow From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery positive 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 assy.
  
  Fig 9: 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 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.
    
    Fig 10: Inspecting Ventilation Valve Operation
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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.
3. Remove the clean hose from the ventilation valve.
  
  Fig 11: Removing Clean Hose From Ventilation Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 12: Inspecting Fuel Tank Cap Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT PURGE VSV

Measure the purge VSV resistance.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

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 result is not as specified, replace the purge VSV.

Fig 13: Measuring Purge VSV Resistance

Check purge VSV operation.
1. Check that air does not flow from port E to port F.
  If the result is not as specified, replace the purge VSV.
  
  Fig 14: Checking Air Does Not Flow From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery positive voltage across the terminals.
3. Check that air flow from port E to port F.
  If the result is not as specified, replace the purge VSV.
  
  Fig 15: Checking Air Flow From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002