2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2064

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2064

* The EVAP system can be filled with smoke more quickly and completely by opening the system opposite the end where the smoke is

injected. When injecting smoke at the service port remove the fuel fill cap, or temporarily leave the vent open, until smoke is observed then

close the system and continue testing. If using a fuel cap adapter at the filler neck, use the J 41413-VLV at the service port to allow the

system to fill faster.

* To help locate intermittent leaks using the J 41413-200, move all EVAP components while observing smoke with the J 41413-SPT.

* Individual components can be isolated and tested using adapters in the J 41413-300.

* A condition may exist where a leak in the EVAP system only exists under a vacuum condition. This type of leak may be detected by using

the scan tool Purge/Seal function to create a vacuum in the EVAP system and then observe the FTP parameter for vacuum decay.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Description and Operation

Evaporative Emission Control System Description (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Evaporative Emission Control System Description)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

* CH-48096 EVAP Service Access Port Tool

* J 41413-200 Evaporative Emissions System Tester (EEST)

* J 41413-300 EVAP Cap and Plug Kit

* J 41413-SPT High Intensity White Light

* J 41413-VLV EVAP Service Port Vent Tool

Circuit/System Testing

Note:

* Refer to the J 41413-200 operation manual for detailed instructions in Evaporative Emission System Diagnosis (See: Powertrain

Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Evaporative Emission

System Diagnosis).

* Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.

* The fuel level should be between 1/4 and 3/4 of a tank.

* Ensure that the underbody temperature of the vehicle and the tester are similar.

1. Do not disturb any of the fuel system components after verification of a DTC P0442 on a vehicle.

2. Using a scan tool, close the EVAP canister vent valve to seal the EVAP system.

3. Change the tank pressure sensor units from in H2O to mm Hg for better resolution.

4. Start the vehicle and monitor the tank pressure sensor output value for approximately two minutes.

5. If the tank pressure sensor value DOES change (shows vacuum):

1. Remove the purge solenoid from the vehicle.

2. Pressurize the fuel tank side of the purge solenoid with J 41413-200.

3. Add smoke and allow pressure to stabilize for 2 minutes.

4. If smoke is allowed to pass through the purge solenoid, replace the purge solenoid.

6. If the tank pressure sensor value DOES NOT change:

1. Install CH-48096 adapter between the purge line from the canister and the purge solenoid. Do not use any other adapter or pressurization

method.

2. With the EVAP system CLOSED, pressurize the system through the CH-48096 adapter and allow the system to completely stabilize for a

minimum of 5 minutes.

3. Add smoke to the system with J 41413-200 after system stabilization.

4. Review all of the critical interfaces for any smoke.

7. Disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH-48096 service

port adapter. Connect the J 41413-200 to the vehicle at the EVAP service port adapter.

8. Using a scan tool close the EVAP canister vent valve to seal the EVAP system.

9. Use the flow meter on the J 41413-200, calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the EVAP system.

瀚慖f a leak is detected, use the J 41413-200 to apply smoke to the EVAP system at the service port or the purge tube until the leak is located

using the J 41413-SPT.