SAAB WIS ONLINE

Tank integrity diagnosis

Tank integrity diagnosis


It is possible to check the evaporative emission system for leaks with the tank integrity diagnosis. If there is a leak, it will not be possible to create or retain a vacuum in the system during the diagnosis.

The diagnosis logic has been improved to give a more reliable diagnosis. Two tests must have failed during the same driving cycle before a diagnostic trouble code is generated.

The diagnosis is performed once per trip and its objective is to determine whether a leak corresponding to a hole larger than 1 mm (0.040”) in diameter is present in the evaporative emission system.

If any of the tests indicate a leak, the message ”TIGHTEN FUEL FILLER CAP” will be displayed on SID. The message is sent after each test that indicates a leak but no more than twice in succession. The diagnosis must first report OK on one occasion before the message can be sent once again.