Diagnostic Instructions
DTC Descriptors
DTC C0253: Centering Error
DTC C0254: Steering Sensor and/or Lateral Accelerometer Bias
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.
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. |
C0254
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. |
| • | 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.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Observe the scan tool Lateral Accelerometer Signal and Yaw Rate Signal parameter while driving the vehicle on a straight and level path greater than 40 km/h (25 mph), the reading should be 2.3V-2.7V.
Circuit/System Testing
- Observe the scan tool SWPS Signal A and SWPS Signal B parameters while turning the steering wheel left and right. Verify the parameters increase and decrease smoothly while the steering wheel is being turned.
| ⇒ | If the parameters do not change smoothly, replace the steering wheel position sensor. |
- Operate the vehicle within the conditions for setting the DTC. Verify DTC C0186, C0196, C0253 or C0254, C0460 or C0461 are not set.
| ⇒ | If DTC C0253 or C0254 is set, replace the yaw and lateral acceleration sensor. If DTC C0253 or C0254 sets again, replace the EBCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
