Circuit Description
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Proper operation of the vehicle stability enhancement system (VSES) is highly dependent on the ability to apply brake pressure to a selected wheel, through the brake pressure modulator valve (BPMV), as commanded by the electronic brake control module (EBCM). The EBCM may not be able to detect certain mechanical failures that may cause the VSES to perform poorly. This diagnostic procedure is designed to help diagnose concerns of poor vehicle stability, that may occur without the presence of any DTCs, by verifying the following.
- The tires are the correct size, properly inflated and in acceptable condition.
- There are no mechanical problems in the steering system.
- There are no mechanical problems in the suspension system.
- There are no mechanical problems in the base brake system.
- All of the VSES related hydraulic controls within the BPMV are functioning correctly.