How to Troubleshoot the VSA System
Self-diagnosis
Self-diagnosis can be classified into two categories:
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Initial diagnosis: Done right after the ignition switch is turned to ON (II) and until the ABS and VSA indicators go off.
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Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned to LOCK (0).
When the system detects a problem, the VSA modulator-control unit shifts to fail-safe mode.