BMW Diagnostic Concept

BMW diagnosis proceeds directly from the faults and their symptoms. Not only does this minimize time and effort but the quality of repair services can be significantly enhanced. Troubleshooting has become an integrated procedure covering all systems at once. The diagnosis program suggests a test schedule and determines the sequence of tests. These features allow faults to be located more easily and with greater precision. Diagnostic procedural steps are:

Start of diagnosis.
Vehicle identification.
Brief test (mandatory).
Fault symptom selection.
DIS test schedule (inspection plan).
Processing of test modules (test information).
Examining results of diagnosis.

The number and sequence of test schedule items is calculated on the basis of seriousness of the symptom and number of times the symptom has been observed. Test results are continually analyzed, and the inspection plan is revised accordingly. Test results can be assigned one of the following status items:

Test not performed.
Test performed, result okay. If the result of a test module is okay, the test modules subordinate to that module are not included in the test schedule.
X = not okay. If the result of a test module is not okay, the test modules subordinate to that module are included in the test schedule.
? = Result not known/test interrupted.
> = Test is being carried (currently active). The results of tests already completed influence the order of preference set up for remaining test modules.
Use continue arrow to proceed to next test. DIS/MoDiC highlights test which should be carried out next. The results of tests already completed are indicated to the left of the test designations. The test schedule is revised each time test schedule screen is reentered following the completion of a module. If a fault has been rectified or its symptoms have changed, this is indicated in the inspection plan display (sequence of test modules). Fault memory contents are assessed according to various criteria (e.g. frequency, temperature).