1.PERFORM THE PRE-INSPECTION.
1) Ask the customer when and how the trouble occurred using the interview check list. 
2) Before performing diagnosis, inspect the unit which might influence the VDC problem.
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Is the component that might influence the VDC problem working properly?
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Repair or replace each component.
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2.CHECK INDICATION OF DTC ON SCREEN.
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to the data link connector.
3) Turn the ignition switch to ON and the Subaru Select Monitor ON.
4) Read the DTC.
5) Record all DTCs and freeze frame data.
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3.PERFORM GENERAL DIAGNOSTICS.
1) Inspect using “General Diagnostic Table”.
2) Perform the Clear Memory Mode.
3) Perform the Inspection Mode.
4) Read the DTC.
5) Check the DTC is not displayed.
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Is the warning light pattern normal?
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Check the warning light. Refer to “List of Diagnostic Trouble Code (DTC)” for the contents of the diagnosis.
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4.PERFORM DIAGNOSIS.
1) Inspect using the “Diagnostic Procedure with Diagnostic Trouble Code (DTC)”.
NOTE:
Refer to “List of Diagnostic Trouble Code (DTC)” for the DTC list.
2) Correct the cause of trouble.
3) Perform the Clear Memory Mode.
4) Perform the Inspection Mode.
5) Read the DTC.
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Inspect using the “Diagnostic Procedure with Diagnostic Trouble Code (DTC)”.
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