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Home >> BMW >> 2008 >> 528xi Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1653 (Self Diagnosis - Theory & Operation (S85)) >> Variable Camshaft (VANOS) including Camshaft and Crankshaft Sensor >> Variable Camshaft (VANOS) >> Rationality check between target and measured position >> Diagnostic Overview

Diagnostic Overview

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.

When pressure condition is detected, the position regulator for each camshaft is activated.

Afterwards, the difference between target position and the measured position is calculated for each position measurement and is filtered with a low pass filter.

If the filtered difference exceeds a positive threshold, a fault code "position retarded" is stored.

If the filtered difference is below a negative threshold, a fault code "position advanced" is stored.

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