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Home >> BMW >> 2008 >> 323i Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 894 (Self Diagnosis - Theory & Operation (N52)) >> Manifold Pressure >> Variable Valve Lift (VVL) - Electrical Diagnosis >> Monitoring function - VVL relay diagnosis

Monitoring function - VVL relay diagnosis

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P1057 

VVL relay diagnosis is performed internally to the ECU and does a comparison of the main relay voltage to the variable valve lift capacitors. If the difference is greater than a threshold then an appropriate DTC will be stored.

Error Symptoms:

ERROR SYMPTOMS

relay diagnosis (battery voltage - capacitor voltage) P1057
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