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Home >> BMW >> 2008 >> 323i Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 893 (Self Diagnosis - Theory & Operation (S85)) >> Evaporative Purge System >> Electrical diagnostic of purge valve circuit >> Monitoring Function

Monitoring Function

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2010 BMW M6, 2010 BMW M5, 2009 BMW M6, 2009 BMW M5, and 2008 BMW M6. However, it is still accessible from the selected car via links, so may be relevant.

A smart low driver performs the testing. It compares current trough the driver in on-condition with an open load threshold. A short to battery is detected by an over current. In off-condition the voltage level is compared with a low limit to detect short to ground.