2007 Jeep Compass

Evaporative Emission Control System

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EVAP Canister



Operation

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

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:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

The EVAP canister mounts to a left rear rail in the rear of the vehicle. The vacuum and vapor tube connect to the top of the canister.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Depress the locking tab on the vapor hose connector and it pull off of the canister.
  8.  
  9. Remove the vapor hose from the ESIM module.
  10.  
  11. Disconnect the electrical connector from the ESIM module.
  12.  
  13. Remove the 2 vapor canister mounting bolts.
  14.  
  15. Remove the EVAP canister assembly.

    Click image to see an enlarged view

    Fig. Remove the EVAP canister assembly

  16.  

To install:

  1. Install the canister and bracket.
  2.  
  3. Connect the filter hose to the ESIM.
  4.  
  5. Connect the vapor hose.
  6.  
  7. Make sure the locking tab on the hose connector locks in place.
  8.  
  9. Connect the electrical connector to the ESIM module.
  10.  
  11. Lower the vehicle.
  12.  
  13. Connect the negative battery cable.

    Click image to see an enlarged view

    Fig. Evaporative Emissions (EVAP) canister location

  14.  

Testing
EVAP Canister

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

  1. The vapor/vacuum lines and hoses must be firmly connected.
  2.  
  3. Check the vapor/vacuum lines at the ESIM switch, filter, and EVAP canister purge solenoid for damage or leaks.
  4.  
  5. If a leak is present, a Diagnostic Trouble Code (DTC) may be set. Check for DTC-s.
  6.  
  7. Check the EVAP canister for the following:

    Cracks at the housing
     
    Fuel saturation
     

  8.  

Evaporative Emission Control System (EVAP) Diagnostics

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

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.  

Related Diagnostic Trouble Codes (DTC)

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

EVAP Purge Control Solenoid



Operation

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

The Evaporative Emissions (EVAP) Control System prevents the evaporation of unburned fuel vapors (Hydrocarbons) from being released into the atmosphere. The Evaporative Emissions (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.

When the vehicle is in operation, the Evaporative Emissions (EVAP) Purge Control Solenoid draws the unburned fuel vapors back into the fuel tank so that the hydrocarbons can be condensed, and redistributed to the engine for correct burning.

Removal & Installation

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect and isolate the negative battery cable at the battery.
  4.  
  5. Disconnect the electrical connector (4) from the evaporator purge solenoid (1).
  6.  
  7. Remove the purge hose (3) from the evaporator purge solenoid (1).
  8.  
  9. Remove the quick connect fuel tank hose (2) from the evaporator purge solenoid (1).
  10.  
  11. Release the tab to remove the evaporator purge solenoid (1) from the body bracket (5).

    Click image to see an enlarged view

    Fig. Evaporative Emissions (EVAP) purge control solenoid location

  12.  

To install:

  1. Install the evaporator purge solenoid (1) to the body bracket (5). Make sure the tab secures the solenoid to the bracket.
  2.  
  3. Install the quick connect fuel tank hose (2) to the evaporator purge solenoid (1).
  4.  
  5. Install the purge hose (3) to the evaporator purge solenoid (1).
  6.  
  7. Connect the electrical connector (4) to the evaporator purge solenoid (1).
  8.  
  9. Connect the negative battery cable, tighten the nut to 45 inch lbs. (5 Nm).
  10.  

Testing
Connection And Wiring Diagnosis

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

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 Purge Control Solenoid

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Turn the Ignition ON , engine not running.
  4.  
  5. Using a 12-volt test light connected to a ground, check the EVAP purge control circuit in the EVAP purge solenoid harness connector.
    NOTE
    The DTC needs to be cleared before actuating the purge solenoid, if present. If the DTC is not cleared, the solenoid may not be allowed to actuate.

  6.  
  7. With the scan tool, actuate the EVAP purge solenoid control to the ON 100 percent position.
  8.  
  9. The test light should be illuminated and brighten proportional to the maximum duty cycle allowed by the scan tool. For example, if the scan tool allows 100 percent actuation, the brightness should be as bright as a direct connection to the battery. If the scan tool allows a maximum 25 percent actuation, the brightness should be 25 percent as bright as a direct connection to the battery.
  10.  
  11. If the light was illuminated and bright, observe the following, verify that there is good pin-to-terminal contact in the Solenoid and PCM connectors. If necessary, replace the EVAP Purge Solenoid.
  12.  

Evaporative Emission Control System (EVAP) Diagnostics

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009

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.  

Related Diagnostic Trouble Codes (DTC)

Specific to:

Jeep Compass 2007-2009

Jeep Patriot 2007-2009



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

 
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