Circuit Description
The Vehicle Stability Enhancement System (VSES) uses inputs from the steering wheel position sensor (SWPS) and the yaw/lateral acceleration sensor to determine if the vehicles steering is centered. The steering centered self calibration occurs when the vehicle travels in a straight path for greater than 10 seconds.
Variation of the SWPS alignment in the steering column is calibrated out by recording a bias value. The bias value is calculated by using inputs from the SWPS and the Yaw/Lateral acceleration sensor.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC C0253 Centering Error |
| • | DTC C0254 Steering Sensor and/or Lateral Accelerometer Bias |
Conditions for Running the DTC
C0253
All of the following conditions exists:
| • | Ignition voltage is greater than 8 volts. |
| • | The vehicle has been driven in a straight path for greater than 10 seconds. |
C254
All of the following conditions exists:
| • | Ignition voltage is greater than 8 volts. |
| • | The vehicle steering centered self calibration is successful. |
Conditions for Setting the DTC
C0253
All of the following conditions exists:
| • | The vehicle is traveling in a straight path greater than 40 km/h (25 mph). |
| • | The vehicle fails to complete the steering centered self calibration in 60 seconds. |
C0254
If the bias value is greater than 40 degrees of steering wheel position the DTC will set.
Action Taken When the DTC Sets
| • | The EBCM disables the VSES for the duration of the ignition cycle. |
| • | The driver information center (DIC) displays the Service Stability message. |
| • | The ABS/Traction Control System (TCS) remains functional. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
If present, diagnose any other VSES DTCs first. Wheel alignment issues should be corrected before diagnosis of this DTC.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Verify that the Lateral Acceleration and Yaw Rate Signal parameter is within the valid range.
-
Perform the Steering Position Sensor Test in order to verify that the SWPS is operating properly.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
|
Important: If present, diagnose any other vehicle stability enhancement system (VSES) DTCs first. Wheel alignment issues should be corrected before diagnosis of this DTC.
Does the scan tool display both parameters within the specified range? | 2.3-2.7 V | Go to Step 3 | Go to Step 6 | |
Did the steering wheel position sensor (SWPS) voltage travel between 0 and 5 volts? | -- | Go to Step 4 | Go to Step 5 | |
4 | Replace the electronic brake control module (EBCM). Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 7 | -- |
5 | Replace the SWPS. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement . Did you complete the replacement? | -- | Go to Step 7 | -- |
6 | Replace the yaw rate/lateral accelerometer sensor. Refer to Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement . Did you complete the replacement? | -- | Go to Step 7 | -- |
7 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
