Starting the test of the fuel tank system

Swift test running status 

This parameter displays that the test is underway.

• RUNNING
• NOT RUNNING.

Fault status 

These parameters display the status of those diagnostic tests which are included in the leak diagnostic.

• Status failure canister close valve
• Status failure rough leak
• Status failure PCV open
• Status failure small leak
• Status failure smallest leak.

The test runs in this order.

These parameters can assume three values depending on the test result.

• NOT READY
• READY NO FAULT
• READY FAULT FOUND.

Other parameters 

• Fuel tank pressure (red line)
• EVAP canister shut-off valve, closes when it is active, ON (green line)
• Canister purge (CP) valve (yellow line).

Running order of the swift test 

The complete swift test is run twice. The difference between the first run through and the second is that the "Small leak" is tested in the first run through and "Smallest leak" in the second run through.

Swift test starts with "Start reading"

The test starts and "RUNNING" is displayed in the status window. The test runs in the order above (see fault status).

The test is interrupted in three different ways, "NOT RUNNING".

• The test is ready
• The test has found a fault
• Physical faults in the car, for example the integral values go to the limit positions because of too great a volumetric efficiency in the EVAP canister.

The test is interrupted when the first run through is ready and no faults have been found. "READY NO FAULT FOUND" in the four left text boxes. By invalidating the idling conditions and returning to the idling conditions, the second run through starts. This is done by depressing and releasing the accelerator pedal (AP). The test starts again and the leak diagnostic is run through once more and "Smallest leak" is tested.

The test is complete when "READY NO FAULT FOUND" is displayed in all fault status windows at the same time that "NOT RUNNING" is displayed in the status window.

If the test has found a fault, "READY FAULT FOUND", the fault must be remedied for the test to be run through completely.

If the test is interrupted, "NOT RUNNING" is displayed in the status window and "NOT READY" is displayed in one of the test windows, the test must be started again: Switch off the engine and then start the engine and the swift test.

The following alternatives are available: 

1. When the leak diagnostic is ready and the test has run without any faults being found, "READY NO FAULT FOUND" is displayed in all fault status windows

   OKAY:  Troubleshooting has been completed.

2. When the leak test has found a fault in the EVAP canister shut-off valve, "READY FAULT FOUND" is displayed in the fault status window for the EVAP canister shut-off valve

   Refer to Flow fault 

3. When the leak test has detected a major leak, "READY FAULT FOUND" is displayed in the fault status window for large leaks

   Refer to Large leak 

4. When the leak test has found a fault in the canister purge (CP) valve, "READY FAULT FOUND" is displayed in the canister purge (CP) valve fault status window

   Refer to Leakage 

5. When the leak test has detected a small leak or a very small leak, "READY FAULT FOUND" is displayed in the fault status window for small leak or smallest leak

   Refer to Checking for blockage between the fuel tank pressure sensor and the fuel tank 

6. The test does not start or is canceled before it is complete.

   Refer to Checking the cause of a fault using quick test 

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS OF NORTH AMERICA.