Avalon 1995-1996

Evaporative Emission Control System

Print

EVAP Canister



Location

Specific to:

Toyota Avalon 1995-1996



Click image to see an enlarged view

Fig. Evaporative Emissions (EVAP) control system components

Operation

Specific to:

Toyota Avalon 1995-1996

The Evaporative Emissions (EVAP) Canister is the primary component in the Evaporative Emission (EVAP) Control System that prevents the evaporation of unburned fuel vapors (Hydrocarbons) from being released into the atmosphere. The EVAP canister contains a charcoal element for the filtering of hydrocarbons, and the filtered Carbon Dioxide (CO2) is then vented to atmosphere when the vehicle is not in operation. The canister also contains a number of ports, which provide for the redistribution of hydrocarbons into the fuel tank when the vehicle is in operation through the purge control system.

Removal & Installation

Specific to:

Toyota Avalon 1995-1996

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Label and disconnect the lines running to the canister.
  4.  
  5. Remove the fasteners.
  6.  
  7. Remove the charcoal canister from the vehicle. Do not attempt to wash the charcoal canister.
  8.  

To install:

  1. Installation is the reverse of removal.
  2.  

Testing
EVAP Canister

Specific to:

Toyota Avalon 1995-1996

  1. Remove the EVAP hoses from charcoal canister.
  2.  
  3. Visually check the charcoal canister for cracks or damage.
  4.  
  5. Check for clogged filter, and stuck check valve and diaphragm:
    1. Install the plug to port E.
    2.  
    3. While holding port B closed, blow air (1.76 kPa, 18 gf/cm2, 0.26 psi) into port A and check that air flows from port D.

      Click image to see an enlarged view

      Fig. While holding port B closed, blow air into port A and check that air flows from port D

    4.  
    5. While holding port B and port D closed, blow air (1.76 kPa, 18 gf/cm2, 0.26 psi) into port A and check that air does not flow from port C.

      Click image to see an enlarged view

      Fig. While holding port B and port D closed, blow air into port A and check that air does not flow from port C

    6.  
    7. Apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in. Hg) to port B, check that the vacuum does not decrease when port C is closed, and check that the vacuum decreases when port C is released.

      Click image to see an enlarged view

      Fig. Apply vacuum to port B, check that the vacuum does not decrease when port C is closed, and check that the vacuum decreases when port C is released

    8.  
    9. While holding port C closed, apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in. Hg) to port A, and check that air flows into port B.

      Click image to see an enlarged view

      Fig. While holding port C closed, apply vacuum to port A and check that air flows into port B

    10.  
    11. If a problem is found, replace the charcoal canister.
    12.  
    13. Remove the plug.
    14.  

  6.  

Related Diagnostic Trouble Codes

Specific to:

Toyota Avalon 1995-1996



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

Fuel Tank Vapor Pressure Sensor



Location

Specific to:

Toyota Avalon 1995-1996



Click image to see an enlarged view

Fig. EVAP Vapor Pressure Sensor



Click image to see an enlarged view

Fig. VSV for Vapor Pressure Sensor

Operation

Specific to:

Toyota Avalon 1995-1996

The Fuel Tank Pressure Sensor (EVAP Pressure Sensor) is a piezoelectric (pressure-sensitive) electronic device that monitors the pressure differential between the Evaporative Emission Control (EVAP) system and atmospheric pressure. The EVAP Pressure Sensor operates within a 5 volt DC reference range, and provides a linear input signal to the Powertrain Control Module (PCM).

Removal & Installation

Specific to:

Toyota Avalon 1995-1996

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the EVAP hoses from the VSV.
  4.  
  5. Remove the screw and VSV.
  6.  

To install:

  1. Installation is the reverse of removal.
  2.  

Testing
Connection & Wiring Diagnosis

Specific to:

Toyota Avalon 1995-1996

Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

Many intermittent open or short circuits may be caused by wiring harness and connector movement due to vibration, engine torque, bumps and rough pavement, etc.

  1. Test the wiring harness and connectors by performing the following tests:

    Move the related connectors and wiring while monitoring the appropriate scan tool data.
     
    Move the related connectors and wiring with the component commanded ON and OFF. Using a suitable the scan tool, observe the component operation.
     
    With the engine running, move the related connectors and wiring while monitoring component operation.
     
    If harness or connector movement affects the data displayed, the component and system operation, or the engine operation, inspect and repair the harness or connections as necessary.
     

  2.  
  3. Test the connector terminal pins and/or wiring by performing the following tests:

    Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body.
     
    Inspect for improperly formed or damaged terminals and test for incorrect terminal tension.
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and/or brittle sections of wire in the suspect circuits.
     
    Inspect for wires that are broken inside the insulation by gently pulling on suspect sections of wiring.
     

  4.  

EVAP Pressure Sensor

Specific to:

Toyota Avalon 1995-1996

When testing the EVAP system for proper operation, there should always be a pressure differential between the fuel tank pressure and atmospheric pressure. If any of the tests reveal a pressure differential of less than .02- Hg (.067 kPa/.5mm Hg), the Powertrain Control Module (PCM) will interpret this condition as a leak.

  1. Verify the condition of the EVAP system by performing the following visual inspections:

    Ensure that the fuel filler cap is installed and properly secured.
     
    Inspect the charcoal canister for physical damage such as cracks, broken or cracked fittings, damage from road debris, or rodent damage.
     
    Inspect all EVAP control devices (EVAP and purge control system monitors, controllers, and actuators) for physical damage such as cracks, broken or cracked fittings, damage from road debris, or rodent damage.
     
    Inspect all hoses and vacuum line connections for proper routing and placement.
     
    Inspect all electronic control devices for proper electrical connections.
     
    Inspect the condition of all fittings and seals for damage, drying, or wear.
     
    Inspect the condition of all hoses and vacuum lines for displacement, damage, or wear.
     

  2.  

If any physical defects are evident, verify the operation of any questionable components before replacement.

  1. Verify the operation of the EVAP system by performing any or all the following tests:

    Using a suitable scan tool, perform an actuator (active) test to verify the correct operation of EVAP control devices (EVAP and purge control system monitors, controllers, and actuators).
     
    Using a smoke machine, verify that the EVAP system does not exhibit any physical leaks.
     
    Using a suitable EVAP system pressure tester, verify that the EVAP system is properly sealed against positive and negative pressure.
     
    Using a suitable EVAP system pressure tester along with a suitable scan tool, monitor the EVAP pressure under positive and negative pressure conditions.
     

  2.  

Verify the operation of all EVAP system components before replacing the EVAP Pressure Sensor.

Click image to see an enlarged view

Fig. EVAP Pressure Sensor Range Chart

EVAP Pressure Sensor Strategy

Specific to:

Toyota Avalon 1995-1996

The EVAP Pressure Sensor is the central component in the EVAP monitoring system. EVAP is a non-continuous monitor under Mode 6 OBD-II diagnostics, and operates within a 5 volt DC reference range. The Powertrain Control Module (PCM) utilizes EVAP Pressure Sensor data to monitor the fuel tank pressure differential, and will log a Diagnostic Trouble Code (DTC) in the event of any leak larger than .02- Hg (.067 kPa/.5mm Hg).

Related Diagnostic Trouble Codes (DTC)

Specific to:

Toyota Avalon 1995-1996



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

 
label.common.footer.alt.autozoneLogo