Emission Control System (3MZ-FE): Inspection

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT VENTILATION VALVE SUB-ASSY
1. Check the operation.
  1. Install a clean hose as shown in the illustration.
  2. Blow air into the cylinder head side, then check that air passes through easily.
    
    Fig 1: Checking Blow Air Into Cylinder Head Side
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    CAUTION: Do not suck air through the ventilation valve. Petroleum substances inside the ventilation valve are harmful.
  3. Blow air into the intake manifold side, then check that air passes through with difficulty.
    If the operation is not as specified, replace the ventilation valve.
    
    Fig 2: Checking Blow Air Into Intake Manifold Side
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FUEL TANK CAP ASSY
1. Check the operation.
  1. Visually check if the fuel tank cap and gasket are deformed or damaged.
    
    Fig 3: Identifying Gasket
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If necessary, replace the fuel tank cap.
INSPECT CHARCOAL CANISTER ASSY
1. Check the operation.
  1. Visually check the charcoal canister to see if the indicated portions by the arrows are cracked or damaged.
    
    Fig 4: Inspecting Charcoal Canister Assy
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If necessary, replace the charcoal canister.
2. Check the operation.
  1. While holding the purge port closed, blow air (0.39 kPa (4.0 gf/cm² , 0.06 psi)) into the vent port, then check that the air flows the air inlet port.
    
    Fig 5: Checking That Air Flows Air Inlet Port
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the operation is not as specified, replace the charcoal canister.
  2. While holding the air inlet port closed, blow air (0.39 kPa (4.0 gf/cm² 0.06 psi)) into the vent port, then check that the air flows from the purge port.
    
    Fig 6: Checking That Air Flows From Purge Port
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the operation is not specified, replace the charcoal canister.
  3. While holding the purge port closed, apply vacuum (3.43 kPa (25.7 mm/Hg, 1.01 in.Hg)) to the vent port, then check that the air is sucked from the purge port.
    
    Fig 7: Checking That Air Is Sucked From Purge Port
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the operation is not as specified, replace the charcoal canister.
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, then check that the vacuum is maintained for 1 minute.
    
    Fig 8: Checking That Vacuum Is Maintained For 1 Minute
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    
    In order to maintain air tightness, the check should be performed with the VSV (for CCV) terminal port held closed by your finger.
    
    If the operation is not as specified, replace the charcoal canister.
4. Inspect the diaphragm.
  1. Remove the air hose.
    
    Fig 9: Removing Air Hose
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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, then check that the air is sucked from port B.
    If the operation is not as specified, replace the charcoal canister.
    
    Fig 10: Removing That Air Is Sucked 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, then measure how long it takes for vacuum to drop.
    Vacuum drop time: 10 seconds or longer
    
    Fig 11: While Holding Vent, Purge And Air Inlet Ports Closed, Applying Vacuum Into Port A
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the operation is not as specified, replace the charcoal canister.
  4. Reinstall the air hose.
5. Disconnect the air hose.
6. Remove the 2 bolts, then remove the VSV.
  
  Fig 12: Removing Bolts
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Inspect the resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Standard:
    
    Fig 13: Tester Specification
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 14: Measuring Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the operation is not as specified, replace the charcoal canister.
8. Check the operation
  1. Check that air flows from port A to B and C.
    
    Fig 15: Checking That Air Flows From Port A To B And C
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Apply battery voltage across the terminals.
  3. Check that the valve is closed.
    
    Fig 16: Applying Battery Voltage Across Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Check that air does not flow from port A to B.
  5. Check that air flows from port A to C.
    
    Fig 17: Checking That Air Does Not Flow From Port A To B
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the operation is not as specified, replace the charcoal canister.
9. Instal the VSV with the 2 bolts.
10. Connect the air hose.
INSPECT VACUUM SWITCHING VALVE ASSY NO. 1
1. Inspect the resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Standard:
    
    Fig 18: Tester Specification
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 19: Measuring Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the operation is not as specified, replace the vacuum switching valve No. 1.
2. Check the operation.
  1. Check that air does not flow from port E to F.
    
    Fig 20: Checking That Air Does Not Flow From Port E To F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Apply battery voltage across the terminals.
  3. Check that air flows from port E to F.
    
    Fig 21: Checking That Air Flows From Port E To F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the operation is not as specified, replace the vacuum switching valve No. 1.
INSPECT AIR FUEL RATIO SENSOR
1. Inspect the resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Standard:
    
    Fig 22: Tester Specification
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 23: Measuring Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the resistance is not as specified, replace the air fuel ratio sensor.
2. Check the continuity.
  1. Using an ohmmeter, check that there is no continuity between terminals 2 (+B) and 4 (AF-).
    If there is continuity, replace the air fuel ratio sensor.
INSPECT HEATED OXYGEN SENSOR
1. Inspect the resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Standard:
    
    Fig 24: Tester Specification
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 25: Measuring Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the resistance is not as specified, replace the heated oxygen sensor.
2. Check the continuity.
  1. Using an ohmmeter, check that there is no continuity between terminals 1 (HT) and 4 (E).
    If there is continuity, replace the heated oxygen sensor.
INSPECT AIR FUEL RATIO SENSOR HEATER RELAY
1. Inspect the resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Standard:
    
    Fig 26: Tester Specification
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 27: Measuring Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the result is not as specified, replace the air fuel ratio sensor heater relay.