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A, Diagnostic System Check |
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Test |
Work Order Description |
Nominal Value |
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T01 |
Customer Complaint |
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• Record customer complaint for later use Note: Use form:
Refer to chapter 8, Attachment
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Yes: T02 |
No: - |
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T02 |
Preliminary Diagnostic Check (Visual Inspection) |
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• Verify battery condition • Check all fuses • Check all connections and plugs of the concerned Electronic System • Check all ground connections • Perform visual check of the concerned Electronic System using recorded Customer Complaint information • Check the concerned system for fluid leaks • After successful test/fault repair proceed to the next test step Note: The battery must not be disconnected at this point of the Diagnostic System Check, as the control units of the vehicle could otherwise lose stored diagnostic information.
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Yes: T03 |
No: - |
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T03 |
Connect Diagnostic Tester and Establish Communication |
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• Connect diagnostic tester, select concerned Electronic System, establish communication and verify, that the correct control unit is installed
Refer to table B-1 • After successful test/fault repair proceed to the next test step
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Yes: T04 |
No: - |
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T04 |
F2 Diagnostic Trouble Codes |
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• Read and record Diagnostic Trouble Codes (F2) including status Note: If a Diagnostic Trouble Code with status PRESENT is stored, perform troubleshooting in accordance with diagnostic trouble code table. After succesful fault repair and ignition switched off and on repeat this test step.
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Is a Diagnostic Trouble Code with status PRESENT stored? |
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Yes: B-2 |
No: T05 |
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T05 |
F7 Programming |
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• Verify programming (F7) of the control unit:
Refer to table B-5 • After successful test/fault repair proceed to the next test step
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Yes: T06 |
No: - |
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T06 |
F0 Data List |
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• Perform quick check data list (F0):
Refer to table B-3 • After successful test/fault repair proceed to the next test step
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Yes: T07 |
No: - |
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T07 |
F6 Additional Functions |
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• Verify adjustment of the system:
Refer to table B-4 • After successful test/fault repair proceed to the next test step
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Yes: T08 |
No: - |
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T08 |
Intermittent System Operation |
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• Evaluate Diagnostic Trouble Codes (F2) with status HISTORY or INTERMITTENT recorded in above test step:
Refer to table B-2 • Clear Diagnostic Trouble Codes • Operate diagnostic tester in Snapshot Mode (set trigger to ALL TROUBLE CODES / INTERMITTENT) and the vehicle in the following conditions:
Repeat the conditions under which, according to the above recorded Customer Complaint, the impaired vehicle performance occured;
Move all wiring harnesses and other components effecting the concerned Electronic System back and forth;
Drive the vehicle in different driving conditions (engine speed and engine load conditions); pay attention to unusual noise and other system irregularities;
If a trigger event is detected by the diagnostic tester and a snapshot is stored, the data around the trigger point "0" should be evaluated/compared to the data listed in the test F0 Data List (use TECH 15 for appropriate presentation of diagnsotic tester snapshot data):
Refer to table B-3
If a Diagnostic Trouble Code gets stored use this information for further troubleshooting:
Refer to table B-2
• After successful test/fault repair proceed to the next test step
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Yes: T09 |
No: - |
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T09 |
Vehicle End Test |
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If all above mentioned test steps have been performed and no malfunction has been detected, the concerned Electronic System is in perfect order.
Nevertheless, perform the following Vehicle End Test: • Clear Diagnostic Trouble Codes • Turn ignition OFF and ON again • Drive the vehicle in different driving conditions (engine speed and engine load conditions) over a considerable distance. Pay attention to unusual noise and other system irregularities. • After test drive read again Diagnostic Trouble Codes
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Is a Diagnostic Trouble Code stored? |
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Yes: B-2 |
No: - |
