Protege 1999-2000

Evaporative Emission Control System

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EVAP Canister



Operation

Specific to:

Mazda Protege 1998-2003

Mazda Protege5 2002-2003

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:

Mazda Protege 1999-2003

Mazda Protege5 2002-2003


NOTE
Manufacturer does not provide a specific removal and installation procedure for this component. Use the illustration as a guide when servicing this component.

Testing

Specific to:

Mazda Protege 1998-2003

Mazda Protege5 2002-2003


CAUTION
Do not apply the pressure more than 2.8 psi (20 kPa) to the charcoal canister. Doing so will damage the charcoal canister.

  1. Remove the charcoal canister.
  2.  
  3. Plug ports A and C, then blow air into port B.
  4.  
  5. Verify that there is no air leakage from the case.
    1. If not as specified, replace the charcoal canister.

      Click image to see an enlarged view

      Fig. Testing the EVAP charcoal canister

    2.  

  6.  

Fuel Tank Vapor Pressure Sensor



Operation

Specific to:

Mazda Protege 1998-2003

Mazda Protege5 2002-2003

The FTP sensor monitors fuel supply pressure from the fuel tank and signals the fuel pump to respond as needed for engine operating conditions.

Removal & Installation

Specific to:

Mazda Protege 1999-2003

Mazda Protege5 2002-2003


NOTE
Manufacturer does not provide a specific removal and installation procedure for this component. Use the illustration as a guide when servicing this component.

Testing

Specific to:

Mazda Protege 1998-2003

Mazda Protege5 2002-2003

  1. Remove the PCM. See -Powertrain Control Module (PCM)- in this section.
  2.  
  3. Connect the 104-Pin Breakout Box to the PCM via the PCM harness connector.
  4.  
  5. Tighten the connector attaching screw to 70-95 inch lbs. (8-10 Nm).
    CAUTION
    Do not apply a vacuum outside the specified limits. Doing so will damage the fuel tank pressure sensor.

  6.  
  7. Turn the ignition switch ON.
    NOTE
    The output voltage varies with the measuring condition. Conditions for the results shown should be:



    Input voltage: 5.0 V
     
    Barometric pressure: 29.9 in. Hg. (101.3 kPa)-absolute pressure
     
    Barometric temperature: 0-182°F (30-100°C)
     

  8.  
  9. Apply pressure to the FTP sensor, then decrease the applied pressure from 1.97 in. Hg. (0.66 kPa) to -1.97 in. Hg. (-6.66 kPa) and verify that the PCM terminal 62 voltage decreases as follows:

    At 1.97 in. Hg (6.66 kPa), output voltage should be 4.05-4.95 V
     
    At 0 in. Hg (0 kPa), output voltage should be 2.25-2.75 V
     
    At -1.97 in. Hg (-6.66 kPa), output voltage should be 0.45-0.55 V
     

    1. If not as specified, replace the fuel tank pressure sensor.
    2.  
    3. If fuel tank pressure sensor is okay, but PCM terminal 62 voltage is out of specification, carry out the -Circuit Open/Short Inspection-.
    4.  

  10.  

Circuit Open/Short Inspection
  1. Remove the PCM. See -Powertrain Control Module (PCM)- in this section.
  2.  
  3. Connect the 104-Pin Breakout Box to the PCM via the PCM engine harness connector.
  4.  
  5. Tighten the connector attaching screw to 70-95 inch lbs. (8-10 Nm).
  6.  
  7. Inspect for an open or short circuit in the following harnesses by probing the applicable sensor and 104-Pin Breakout Box terminals with ohmmeter leads.
    1. If there is an open or short circuit, repair or replace wiring harnesses.
    2.  
    3. If there is no open or short circuit, replace the fuel tank pressure sensor.
    4.  

  8.  
  9. To check for open circuit:

    Fuel tank pressure signal circuit (Fuel tank pressure sensor connector terminal B and PCM connector terminal 62)
     
    Constant voltage circuit (Fuel tank pressure sensor connector terminal C and PCM connector terminal 90)
     
    GND circuit (Fuel tank pressure sensor connector terminal A and PCM connector terminal 91)
     

  10.  
  11. To check for short circuit:

    Fuel tank pressure signal circuit (Fuel tank pressure sensor connector terminal B and PCM connector terminal 62)
     
    Constant voltage circuit (Fuel tank pressure sensor connector terminal C and PCM connector terminal 90)
     

  12.  
  13. Reconnect the fuel tank pressure sensor connector.

    Click image to see an enlarged view

    Fig. FTP sensor harness side connector pin arrangement

  14.  

 
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