Perform quick-test tank system
- Activate the test by pressing on the symbol for VCT2000.
- Read off initial parameters and check them according to start conditions for performing the test.
- Press the button "Start" to start the quick-test.
- Check that the test has started. Parameters run status shall go to "In progress" and the test phase shall go to "Reference".NOTE:
If the test does not start, check that the start conditions are fulfilled.
When the reference phase is finished, check of the tank system starts. The pressure in the tank starts to increase, see graph. Within 15 minutes the Engine control module (ECM) makes a decision as to whether there is leakage in the tank system or not. The test is finished.
- Check parameters for test result and follow relevant instructions below.NOTE:
Estimated leakage shall be used to get an idea of the proximity to the diagnostic trouble code limit. If the estimated leakage is very near the diagnostic trouble code limit, troubleshooting should probably be performed despite the Tank system, test result shows "No leakage found", especially if diagnostic trouble code for leakage has been stored earlier.
NOTE:Use diagnostic trouble code counter to see the frequency of the problem. Also use frozen values to get an idea if external conditions may have affected the result. Compare with current conditions in the workshop.
Conditions for starting the quick test of the fuel tank system
- No DTCs related to EVAP purge valve or ambient air pressure sensor set.
- Battery voltage 11-15 V.
- Atmospheric pressure higher than 750 hPa, appr. 2500 m (8200 ft).
- Fuel level 0-85 %.
- Ambient air temperature 4-35 °C (39-95 °F).
NOTE:The battery voltage must be correct throughout the entire test. The test can take up to 15 minutes, depending on the quantity of fuel in the fuel tank. It is highly recommended to use the constant voltage charger, Midtronics PSC-550, during the test.
Other information
- See Description of parameters, quick test of the fuel tank system
- See Test phases, quick test fuel tank system
- For information on leakage diagnosis, see Design and Function.
- See Connecting the breakout box
- See Signal description
- See Leak diagnostic pump, replacing
Select alternative according to relevant test results:
- DMTL, test result = "Problem found"
Refer to DMTL, test result = "Problem found"
- Tank system, test result = "No leakage found"
- Tank system, test result = "Major leakage found" or "Minor leakage found"
Refer to Tank system, test result = "Major leakage found" or "Minor leakage found"
- DMTL, test result and Tank system, test result = "Unknown"
Refer to DMTL, test result and Tank system, test result = "Unknown"
- Cancel fault-tracing.
FAULT NOT FOUND: Troubleshooting has been completed.