Suzuki XL7 2007 Service Manual page 230

1A-125 Engine General Information and Diagnosis:
9. Use the remote switch to introduce smoke into the
EVAP system.
NOTE
The fuel tank may need to be lowered to
improve visibility of some of the EVAP
system components.
10. Verify that smoke is not exiting the entire EVAP
system with the J 41413-SPT.
➢ If smoke is observed, repair the condition as
necessary.
NOTE
The fuel tank may need to be lowered to
improve visibility of some of the EVAP
system components.
11. Verify the individual EVAP system components for a
leak using the J 41413-300.
➢ If a condition is found replace the affected
component.
Blockage/Restriction Testing
1. Connect the GE-41415-50 to the fuel tank filler neck.
Connect the J 41413-200 to the GE-41415-50.
2. Disconnect the EVAP vent line from the vent
solenoid, and seal it, using the correct plug from the
J 41413-300.
3. Pressurize the EVAP system with nitrogen to 5
inches H20. Compare the Fuel Tank Pressure
Sensor parameter with a scan tool to the J 41413-
200 pressure/vacuum gage. The scan tool FTP
sensor parameter should be within 1 inch H20 of the
pressure/vacuum gage.
➢ If the FTP sensor parameter is not within 1 inch
H20 of the pressure/vacuum gage, replace the FTP
sensor.
4. Increase the EVAP purge solenoid to 100 percent.
The FTP sensor pressure should drop to less than 1
in H2O.
➢ If the FTP sensor parameter is greater than 1 in
H2O, disconnect the EVAP pipes listed below one
at a time while observing the FTP sensor
parameter with a scan tool. If the FTP sensor
parameter drops to less than 1 in H2O when a pipe
is disconnected, repair the blockage or restriction in
the one of the following EVAP pipe/hoses:
a. EVAP purge vacuum source from the EVAP
purge solenoid
b. EVAP purge pipe from the EVAP purge solenoid
c. EVAP purge pipe at the EVAP canister
d. EVAP vapor pipe at the EVAP canister
5. If you cannot locate a condition with the EVAP
system, refer to Diagnostic Aids for additional
information.
Component Testing
1. Pressurize the EVAP system to 5 inches H20.
2. Compare the Fuel Tank Pressure sensor parameter
with a scan tool to the J 41413-200 pressure/vacuum
gage. The scan tool FTP sensor parameter should
be within 1 inch H20 of the pressure/vacuum gage.
3. Command the EVAP vent valve open with a scan
tool.
4. The scan tool Fuel Tank Pressure parameter should
be 0 inches H20.
➢ If the FTP sensor parameters do not respond to the
change in pressure, replace the FTP sensor.
Repair Instructions
• "Fuel Tank Pressure Sensor Replacement: "
• "Evaporative Emission Canister Purge Solenoid Valve
Replacement: "
• "Evaporative Emission Canister Vent Solenoid Valve
Replacement: "
• "Evaporative Emission Pipe Replacement: "
• "Evaporative Emission Canister Replacement: "
Repair Verification
1. Turn the nitrogen/smoke valve to nitrogen.
2. Command the EVAP vent valve closed with a scan
tool.
3. Use the remote switch to activate the J 41413-200.
4. Use the remote switch to introduce nitrogen and fill
the EVAP system until the floating indicator
stabilizes.
5. Verify the flow meter's stable floating indicator
position is at or below the red flag.
6. Clear the DTCs with a scan tool.
DTC P0496
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
• Review "Strategy Based Diagnosis: " for an overview
of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: " provide an overview of each
diagnostic category.
DTC Descriptor
DTC P0496: Evaporative Emissions (EVAP) System
Continuous Purge Flow