2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1369

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1369

1. Disconnect the purge tube at the quick connector on the evaporative emission canister side of the Q12 evaporative emission canister purge

solenoid valve. Install the CH 48096 - Service Access

Port Tool between the disconnected purge tube and the purge solenoid valve. Connect the J 41413-200 - EEST to the service access port tool.

2. Use a scan tool to seal the evaporative emission system.

3. Use the flow meter on the J 41413-200 - EEST , calibrated to 0.51 millimeter (0.020 inch) to determine that there is no leak in the

evaporative emission system.

瀚慖f a leak is detected, use the J 41413-200 - EEST to apply smoke to the evaporative emission system at the purge tube until the leak is

located using the J 41413-SPT - White Light.

4. To test for a restriction, connect the J 41413-200 - EEST nitrogen/smoke hose to the to the J 41413-311 - Evaporative

Emission Plug brass cone adapter. Disconnect the hose at the fuel cap end of the CH 41415-50 - Adapter. Connect the J 41413-311 - Evaporative

Emission Plug to the disconnected hose on the GH 41415-50 - Adapter. Install the CH 41415-50 - Adapter filler neck end only to the vehicle.

5. Allow the engine to idle.

6. Use the Purge/Seal function to seal the system with a scan tool.

7. Command the EVAP Purge Solenoid Valve to 30 percent.

8. The vacuum/pressure gauge on the J 41413-200 - EEST and the fuel tank pressure parameter on the scan tool should both show vacuum.

瀚慖f the vacuum/pressure gauge shows vacuum, but the fuel tank pressure parameter does not show vacuum, replace the fuel tank pressure

sensor.

瀚慖f neither the fuel tank pressure parameter nor the vacuum/pressure gauge shows vacuum, repair the restriction in the purge path.

9. Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 V, and the values are similar between the scan tool and

the vacuum/pressure gauge on the J 41413-200 - EEST.

瀚慖f the values are not similar, or the voltage did not reach 3.2 V, replace the B150 fuel tank pressure sensor.

Repair Instructions

* Fuel Tank Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Tank Pressure Sensor/Service

and Repair)

* Evaporative Emission Canister Purge Solenoid Valve Replacement (LF1) (See: Powertrain Management/Emission Control

Systems/Evaporative Emissions System/Canister Purge Solenoid/Service and Repair)Evaporative Emission Canister Purge Solenoid Valve

Replacement (LAU) (See: Powertrain Management/Emission Control Systems/Evaporative Emissions System/Canister Purge

Solenoid/Service and Repair)

* Evaporative Emission Canister Vent Solenoid Valve Replacement (NT7, NU5) (See: Powertrain Management/Emission Control

Systems/Evaporative Emissions System/Evaporative Emission Control Canister/Canister Vent Valve/Service and Repair)

* Evaporative Emission Canister Replacement (NT7, NU5) (See: Powertrain Management/Emission Control Systems/Evaporative Emissions

System/Evaporative Emission Control Canister/Service and Repair)

Repair Verification

1. Seal the evaporative emission system and use the flow meter on the J 41413-200 - EEST , calibrated to 0.51 mm (0.020 in) to determine that

there is no leak in the evaporative emission system.

2. Clear DTCs.

P0457

DTC P0455 or P0497 (LAU)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0455

- Evaporative Emission (EVAP) System Large Leak Detected

DTC P0497

- Evaporative Emission (EVAP) System No Flow During Purge

Circuit/System Description