H3 2006

Evaporative Emission Control System

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EVAP Canister



Location

Specific to:

Hummer H3 2006-2010

Refer to the graphics in the Removal and Installation section for the location(s).

Operation

Specific to:

Hummer H3 2006-2010

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:

Hummer H3 2006-2010

  1. Raise and support the vehicle.
  2.  
  3. Disconnect the Evaporative Emission (EVAP) canister vent solenoid valve electrical connector.

    Click image to see an enlarged view

    Fig. Disconnect the Evaporative Emission (EVAP) canister vent solenoid valve electrical connector (1)

  4.  
  5. Disconnect the EVAP line quick connect from the EVAP canister.

    Click image to see an enlarged view

    Fig. Disconnect the EVAP line quick connect (1) and the EVAP chassis line (2) from the EVAP canister

  6.  
  7. Disconnect the EVAP chassis line from the EVAP canister.
  8.  
  9. Remove the bolt securing the EVAP canister to the crossmember.

    Click image to see an enlarged view

    Fig. Remove the bolt securing the EVAP canister to the crossmember

  10.  
  11. Disengage the EVAP canister from the crossmember bracket tabs.

    Click image to see an enlarged view

    Fig. Disengage the EVAP canister from the crossmember bracket tabs

  12.  
  13. Remove the EVAP canister.
  14.  
  15. If replacing the EVAP canister, remove the EVAP canister vent solenoid valve. Perform the following:
    1. Disconnect the EVAP canister vent solenoid valve quick connect from the EVAP canister .
    2.  
    3. Disengage the bracket retaining tab and remove the EVAP canister vent solenoid valve.
    4.  

  16.  

To install:

  1. If the EVAP canister was replaced, install the EVAP canister vent solenoid valve. Perform the following:
    1. Engage the bracket retaining tab and install the EVAP canister vent solenoid valve.
    2.  
    3. Connect the EVAP canister vent solenoid valve quick connect to the EVAP canister .
    4.  

  2.  
  3. Install the EVAP canister.
  4.  
  5. Engage the EVAP canister to the crossmember bracket tabs.
  6.  
  7. Install the bolt securing the EVAP canister to the crossmember. Tighten the bolt to 18 ft. lbs. (25 Nm).
  8.  
  9. Connect the EVAP chassis line to the EVAP canister.
  10.  
  11. Connect the EVAP line quick connect (1) to the EVAP canister.
  12.  
  13. Connect the EVAP canister vent solenoid valve electrical connector.
  14.  
  15. Lower the vehicle.
  16.  

Testing
Evaporative Emission Control System Diagnostics

Specific to:

Hummer H3 2006-2010

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

Specific to:

Hummer H3 2006-2010



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

EVAP Canister Purge Solenoid Valve



Location

Specific to:

Hummer H3 2006-2010

Refer to the graphics in the Removal and Installation section for the location(s).

Operation

Specific to:

Hummer H3 2006-2010

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
3.5L & 3.7L Engines

Specific to:

Hummer H3 2006-2010

  1. Raise and support the vehicle only high enough to access the Evaporative Emission (EVAP) canister purge solenoid valve through the wheelhouse.
  2.  
  3. Remove the left wheelhouse liner.
  4.  
  5. Disconnect the EVAP purge solenoid line quick connect from the purge solenoid valve.

    Click image to see an enlarged view

    Fig. Disconnect the EVAP purge solenoid line quick connect (4) from the purge solenoid valve

  6.  
  7. Disconnect the EVAP purge line from the purge solenoid valve.

    Click image to see an enlarged view

    Fig. Disconnect the EVAP purge line (1) from the purge solenoid valve (3)

  8.  
  9. Disconnect the EVAP canister purge solenoid valve electrical connector.

    Click image to see an enlarged view

    Fig. Disconnect the EVAP canister purge solenoid valve electrical connector

  10.  
  11. Remove the bolt securing the EVAP canister purge solenoid valve to the engine.

    Click image to see an enlarged view

    Fig. Remove the bolt securing the EVAP canister purge solenoid valve to the engine

  12.  
  13. Remove the EVAP canister purge solenoid valve from the engine.
  14.  

To install:

  1. Position the EVAP canister purge solenoid valve to the engine.
  2.  
  3. Install the bolt securing the EVAP canister purge solenoid valve to the engine.
  4.  
  5. Connect the EVAP canister purge solenoid valve electrical connector.
  6.  
  7. Connect the EVAP purge line to the purge solenoid valve.
  8.  
  9. Connect the EVAP purge solenoid line quick connect to the purge solenoid valve.
  10.  
  11. Install the left wheelhouse liner.
  12.  
  13. Lower the vehicle.
  14.  

5.3L Engine

Specific to:

Hummer H3 2006-2010

  1. Remove the intake manifold cover.
  2.  
  3. Disconnect the chassis Evaporative Emission (EVAP) line quick connect fitting (1) from the EVAP canister purge solenoid valve.

    Click image to see an enlarged view

    Fig. Disconnect the chassis EVAP line quick connect fitting from the EVAP canister purge solenoid valve; quick connect (2), nut (3)

  4.  
  5. Disconnect the engine EVAP line quick connect fitting from the EVAP canister purge solenoid valve.

    Click image to see an enlarged view

    Fig. Disconnect the engine EVAP line (1) quick connect fitting from the EVAP canister purge solenoid valve

  6.  
  7. Disconnect the engine wiring harness electrical connector from the EVAP canister purge solenoid valve.

    Click image to see an enlarged view

    Fig. Disconnect the engine wiring harness electrical connector from the EVAP canister purge solenoid valve

  8.  
  9. Using a small flat bladed tool, disengage the retaining tab, and remove the EVAP canister purge solenoid valve from the fuel rail bracket.

    Click image to see an enlarged view

    Fig. Using a small flat bladed tool, disengage the retaining tab, and remove the EVAP canister purge solenoid valve (1) from the fuel rail bracket

  10.  

To install:

  1. Using a small flat bladed tool, reposition the retaining tab if necessary.
  2.  
  3. Install the EVAP canister purge solenoid valve to the fuel rail bracket.
  4.  
  5. Connect the engine wiring harness electrical connector to the EVAP canister purge solenoid valve.
  6.  
  7. Connect the engine EVAP line quick connect fitting to the EVAP canister purge solenoid valve.
  8.  
  9. Connect the chassis EVAP line quick connect fitting to the EVAP canister purge solenoid valve.
  10.  
  11. Install the intake manifold cover.
  12.  

Testing
Connection & Wiring Diagnosis

Specific to:

Hummer H3 2006-2010

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.  

Evaporative Emission Control System (EVAP) Diagnostics

Specific to:

Hummer H3 2006-2010

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:

Hummer H3 2006-2010



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

EVAP Canister Vent Solenoid Valve



Location

Specific to:

Hummer H3 2006-2010

The EVAP canister vent solenoid valve is located on the EVAP canister assembly.

Operation

Specific to:

Hummer H3 2006-2010

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 Valve 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:

Hummer H3 2006-2010

  1. Raise and support the vehicle.
  2.  
  3. Disconnect the Evaporative Emission (EVAP) canister vent solenoid valve electrical connector.

    Click image to see an enlarged view

    Fig. Disconnect the Evaporative Emission (EVAP) canister vent solenoid valve electrical connector (1)

  4.  
  5. Disconnect the fuel fill pipe vapor line quick connect from the EVAP canister.

    Click image to see an enlarged view

    Fig. Disconnect the fuel fill pipe vapor line quick connect (1) from the EVAP canister; line (2)

  6.  
  7. Disconnect the EVAP canister vent solenoid valve quick connect from the EVAP canister.
  8.  
  9. Disengage the bracket retaining tab and remove the EVAP canister vent solenoid valve.

    Click image to see an enlarged view

    Fig. Disengage the bracket retaining tab and remove the EVAP canister vent solenoid valve (1)

  10.  

To install:

  1. Engage the bracket retaining tab and install the EVAP canister vent solenoid valve.
  2.  
  3. Connect the EVAP canister vent solenoid valve quick connect to the EVAP canister.
  4.  
  5. Connect the fuel fill pipe vapor line quick connect to the EVAP canister.
  6.  
  7. Connect the EVAP canister vent solenoid valve electrical connector.
  8.  
  9. Lower the vehicle.
  10.  

Testing
Connection & Wiring Diagnosis

Specific to:

Hummer H3 2006-2010

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.  

Evaporative Emission Control System (EVAP) Diagnostics

Specific to:

Hummer H3 2006-2010

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:

Hummer H3 2006-2010



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

Fuel Tank Vapor Pressure Sensor



Location

Specific to:

Hummer H3 2006-2010

Refer to the graphics in the Removal and Installation section for the location(s).

Operation

Specific to:

Hummer H3 2006-2010

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:

Hummer H3 2006-2010

  1. Remove the fuel tank.
  2.  
  3. Gently pull and/or pry in an upward motion, in order to remove the fuel tank pressure sensor from the fuel tank module.

    Click image to see an enlarged view

    Fig. Gently pull and/or pry in an upward motion, in order to remove the fuel tank pressure sensor from the fuel tank module

  4.  

To install:

  1. Lightly lubricate the fuel tank pressure sensor seal with clean engine oil.
    NOTE
    Ensure that the fuel pressure sensor sits between the alignment feature in the fuel tank module.

  2.  
  3. Firmly press down on top of the fuel pressure sensor, in order to install the sensor into the fuel tank module.
  4.  
  5. Install the fuel tank.
  6.  

Testing
Connection & Wiring Diagnosis

Specific to:

Hummer H3 2006-2010

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:

Hummer H3 2006-2010

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:

Hummer H3 2006-2010

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:

Hummer H3 2006-2010



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

 
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