Diagnostic Cable
20 pin cable for connection of the diagnostic head to the 20 pin diagnostic socket
Scheme 544
E46 Diagnostic Concept
E46 diagnosis is set apart from traditional diagnosis procedures by the fact that it 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.
E46 Diagnostic Procedural Steps
- Start of diagnosis
- Vehicle identification
- Short test (mandatory)
- Fault symptom selection
- DIS Test Schedule (inspection plan)
- Processing of test modules (test information)
- Examining results of diagnosis
Scheme 545
The E46 Diagnostic Concept is also used for E36/7,E38, E39, E53, E52 vehicles.
Start Of Diagnosis
Call up the diagnosis program and select the appropriate vehicle. The tester mode is now installed according to information stored in the equipment network so that the vehicle can be identified (E36, E38, E39, E46, E53, E52).
Scheme 546
Fault Symptom Selection
Once the short test has been completed, use the continue arrow (bottom right) to call up the fault symptom selection screen.
The Fault symptom selection screen displays all fault memories set for troubleshooting purposes.
Service technicians can enter fault symptoms observed by themselves or by the vehicle owner. This is done by selecting the appropriate items in a predefined list of symptoms.
Several fault symptoms can be selected simultaneously.
Use the transfer key to transfer selected fault symptoms into the display
The test schedule is generated on the basis of both the symptoms observed by customers or service tech's and the contents of the fault memories.
Scheme 547
Test Schedule
The test schedule is generated specifically for the problem at hand based on all current fault symptoms including those stored in fault memories of other control modules.
Diagnosis tests are prioritized in an order established by the MoDiC/DIS.
The test schedule screen displays one or several symptoms, diagnosis tests and corresponding test modules.
Scheme 548
The number and sequence of test schedule items is calculated on the basis of
- seriousness of the symptom
- 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 (listed in on line help).
- = test not performed
- ! = test performed, result OK If the result of a test module is OK, the test modules subordinate to that module are not included in the test schedule.
- X = not OK If the result of a test module is not OK, 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 the continue arrow to proceed to the next test.
DIS/MoDiC highlights the test which should be carried out next (dark background).
The results of tests already completed are indicated to the left of the test designations.
Note. The test schedule is revised each time the "test schedule" screen is re-entered 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).
Test Information
Press the continue arrow to advance to the next test schedule. The Test Information screen appears automatically.
The test information screen automatically displays documents including
- Wiring Schematics
- Functional descriptions
- Connector locations, etc.
The Test Dialog box displays test points and nominal values automatically. This screen format is used throughout the diagnostic software for all systems.
Scheme 549
"Expert Mode" Troubleshooting
Expert Mode troubleshooting can be activated at any time during system guided troubleshooting.
Press the operating button in the navigation line. You have access to the following screens.
- Documents
- Function and component selection
- Test Schedule (own test schedule)
- Control Unit functions
- Measurement system
To return to system - guided diagnosis, press the appropriate button. Any documents assigned to the diagnosis test which is currently active may be viewed. A new diagnosis test can be selected at any time in "function and component selection".
Press the Test Schedule button to call up the test modules assigned to the diagnosis tests. A second schedule list, "Own test schedule" now displays the test modules assigned to selected diagnosis tests.
