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Emission Control System: Inspection

INSPECT VENTILATION VALVE SUB-ASSY
1. Install a clean hose into the ventilation valve.
2. Inspect the 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 harmful.
    
    Fig 1: Inspecting Ventilation Valve Operation (Blow 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 operation is not as specified, replace the ventilation valve.
3. Remove the clean hose from the ventilation valve.
  
  Fig 2: Inspecting Ventilation Valve Operation (Blow Air Into Intake Manifold Side)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FUEL TANK CAP ASSY
1. Visually check if the cap or gasket is deformed or damaged.
  
  Fig 3: Checking Fuel Tank Cap Or Gasket
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CHARCOAL CANISTER ASSY

Visually check the charcoal canister for cracks or damage.
Inspect the charcoal canister operation.

Fig 4: Inspecting Charcoal Canister Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Plug the vent port with a cap.
  
  Fig 5: Plugging Vent Port With Cap
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. While holding the purge port closed, blow air (1.76 kPa, 18 gf/cm² , 0.26 psi) into the EVAP port and check that air flows from the air inlet port.
3. Plug the air inlet port with your finger.
  
  Fig 6: Checking That Air Flows From Air Inlet Port
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the purge port, check that the vacuum decreases when the air inlet port is opened.
  
  Fig 7: Checking That Vacuum Decreases When Air Inlet Port Is Opened
  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 the operation is not as specified, replace the charcoal canister.
6. Remove the cap from the vent port.
  
  Fig 8: Checking That Air Flows Into Purge Port
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Inspect the VSV for open circuit.

Using an Ohmmeter, check the resistance between the terminals.

Resistance:

VSV TERMINALS RESISTANCE

Temperature	Resistance
At 20°C (68°F)	25 to 30 Ω
At 120°C (248°F)	32 to 40 Ω

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

Fig 9: Inspecting VSV For Open Circuit

G03197084

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the VSV for ground.
1. Using an ohmmeter, check that there is no continuity between each terminal and the body.
  If there is continuity, replace the VSV.
  
  Fig 10: Checking VSV For Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check the VSV operation.
1. Check that air flows from port A to port B.
  
  Fig 11: Checking Air Flows From Port A To Port B
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery positive voltage across the terminals.
3. Check that air does not flow from port A to port B.
  If operation is not as specified, replace the VSV.
  
  Fig 12: Checking Air Does Not Flow From Port A To Port B
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT DUTY VACUUM SWITCHING VALVE
1. Inspect the resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Resistance: 30 to 34 Ω at 20°C (68°F)
    
    If the resistance is not as specified, replace the VSV.
    
    Fig 13: Measuring Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the VSV for ground.
  1. Using an ohmmeter, check that there is no continuity between each terminal and the body.
    If there is continuity, replace the VSV.
    
    Fig 14: Checking That There Is No Continuity Between Each Terminal & Body
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the VSV operation.
  1. Check that air flows with difficulty from port E to port F.
    
    Fig 15: Checking That Air Flows With Difficulty 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 operation is not as specified, replace the VSV.
    
    Fig 16: Checking That Air Flows From Port E To Port F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT HEATED OXYGEN SENSOR (BANK 1 OXYGEN SENSOR)

Using an Ohmmeter, measure the resistance between the terminals.

Standard:

HEATED OXYGEN SENSOR TERMINAL RESISTANCE (BANK 1 OXYGEN SENSOR)

Tester Connection	Specified condition
1 (HT) - 2 (+B)	1 Ω or less
1 (HT) - 4 (E1)	10 kΩ or higher

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

Fig 17: Identifying Heated Oxygen Sensor Terminal (BANK 1 Oxygen Sensor)

G03197092

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT HEATED OXYGEN SENSOR (BANK 1 OXYGEN SENSOR NO.2)

Using an ohmmeter, measure the resistance between the terminals.

Standard:

HEATED OXYGEN SENSOR TERMINAL RESISTANCE (BANK 1 OXYGEN SENSOR NO.2)

Tester Connection	Specified condition
1 (HT) - 2 (+B)	1 Ω or less
1 (HT) - 4 (E1)	10 kΩ or higher

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

Fig 18: Identifying Heated Oxygen Sensor Terminal (BANK 1 Oxygen Sensor No. 2)

G03197093

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002