Carry out the test module "System analysis: message not present".In this test module, all "Message not present" fault code entries from all control units are analysed. This makes it possible to localise the fault to a specific area (most likely fault cause).In many cases, the faults only occur sporadically. To determine the precise fault cause, additional measurements based on the results of the analysis routine need to be carried out (voltage supply, short circuit, contact problems).If it proves impossible to identify a clear and unambiguous fault cause and the fault pattern continues to appear repeatedly (repeat repairs), then it may be necessary to replace the related wiring, plug connections or the control unit.Attention:If the fault only appears sporadically (no repeat repair) and if no customer complaints concerning the problem have been received, then replacement of the related control unit is neither approved nor logical.
Note:
These faults usually appear in large numbers. If only a single fault related to a missing message has been entered and no problems related to the function of the control unit are present, then the fault can be ignored.
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