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Home >> BMW >> 2008 >> 550i Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Self Diagnosis - Theory & Operation (N62) >> Camshaft and Crankshaft Sensor including Valve Timing >> Valvetronic >> Valvetronic Module >> General description of this module

General description of this module

This module is for checking the functionality of the VVT-Control Unit and for the storage of data that remains permanently stored after a deactivation of the ECU. Regarding the valvetronic this information includes: learning value for end position, diagnosis information for the manufacturer and configuration information.

Four functional units are integrated into the valvetronic module to fulfill these tasks.

Function and diagnosis of these 4 integrated units:

  1. EEPROM:  This unit carries out a comparison of the checksum. As soon as a deviation of the EEPROM-data as compared to the checksum is detected, there will be the error entry "invalid checksum EEPROM" (P1041 / P1044).
  2. RAM:  This unit is for the information storage during the normal operation. When an error occurs during writing of data into the test patterns during the initialization phase of the ECU, there is the error entry "invalid checksum RAM" (P1042 / P1045).
  3. ROM:  This unit is for the storage of the program flow and the calibration data with storage mode flash. When an error occurs during the continuous comparison with the CRC-sum in the memory, there is the error entry "invalid checksum ROM" (P1043 / P1046).
  4. Watchdog, Temp-Sensor:  An emergency switch off path, that switches off the output stage in case of a faulty processor, its integrated in the unit "watchdog". The temperature is applied to a thermal protection model in order to prevent output stage thermal overload. When a watchdog or temperature sensor occurs, there is the corresponding error entry t "watchdog, temp, sensor on  " (P1071 / P1072).
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