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Tank integrity diagnosis - B204L only

Tank integrity diagnosis - B204L only


A check that no leakage occurs in the evaporative emission system can be carried out by means of tank integrity diagnosis. A leak is characterized in that a vacuum cannot be achieved or maintained in the system during the diagnostic process.

The diagnostics logic has been improved to provide surer diagnosis. It is necessary for two tests with negative results to have been performed before a diagnostic trouble code is generated.

To make sure the fuel cap is in place and screwed on tightly, there is a narrow coupling between the rollover valve and the upper part of the filler pipe. If the fuel cap is not in place, air will be forced down into the system preventing the formation of negative pressure, generating a diagnostic trouble code.