Diagnostic Test Drive

When servicing vehicles with Vehicle Stability Enhancement System (VSES), test drives will be necessary to allow all tests to be run, and all system functions to be enabled and exercised. A test drive may also be required to duplicate specific DTCs covered in this section. Diagnostic system check (including test drive) should be run when vehicle repairs are complete in order to verify repair. Diagnostic test drive will vary for ABS/TCS or VSES problems. The following is a suggested VSES diagnostic test drive.

1. Read diagnostic aids and circuit description.
2. Reconnect any previously disconnected components.
3. Start engine.
4. Drive vehicle under following conditions for at least 10 minutes.
   • Highway driving.
   • Rough roads.
   • Perform turning maneuvers (curved freeway entrance ramp, parking lot maneuvers) and high steering angles and yaw rates at low speeds.
   • Verify customers concern and duplicate driving conditions.
   • With engine still running, use scan tool and check for any DTCs.