C0287
DTC C0186, C0196, or C0287
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC C0186 00
-
Lateral Accelerometer Circuit Malfunction
DTC C0186 5A
-
Lateral Accelerometer Circuit Not Plausible
DTC C0196 00
-
Yaw Rate Circuit Malfunction
DTC C0196 5A
-
Yaw Rate Circuit Not Plausible
DTC C0287 00
-
Longitudinal Acceleration Sensor Circuit Malfunction
DTC C0287 71
-
Longitudinal Acceleration Sensor Circuit Invalid Data
DTC C0287 4B
-
Longitudinal Acceleration Sensor Circuit Calibration Not Learned
DTC C0287 5A
-
Longitudinal Acceleration Sensor Circuit Not Plausible
Diagnostic Fault Information
Circuit/System Description
The yaw rate, lateral acceleration, and longitudinal acceleration sensors are combined into one yaw/lateral/longitudinal accelerometer sensor, external to the electronic brake control module. The electronic brake control module supplies a 12 V reference to the accelerometer sensor. The accelerometer sensor communicates with the electronic brake control module via serial data. The module activates the stability control and the hill start assist function depending on the information received from the accelerometer sensor.
Conditions for Running the DTC
The vehicle speed is greater than 40 km/h (25 mph).
Conditions for Setting the DTC
C0186 00
The lateral acceleration sensor signal offset is higher than 2.25 meters per second squared while driving straight ahead on a level surface with normal acceleration.
C0186 5A
* The lateral acceleration sensor signal is not plausible with the yaw rate sensor signal.
* The yaw and lateral accelerometer sensor reports an internal failure
* Communication is lost between the electronic brake control module and the yaw and lateral accelerometer sensor.
C0196 00
When the vehicle is at standstill the yaw rate is zero. If the calculated offset value is outside the plausible range ± 5.25° per second at start of driving the fault is set.
C0196 5A
* The yaw rate sensor signal is not plausible with the lateral acceleration sensor signal.
* A correlation error between the yaw and lateral accelerometer sensor and steering angle sensor.
* Communication is lost between the electronic brake control module and the yaw and lateral accelerometer sensor.
C0287 00 or C0287 5A
No longitudinal sensor signal
C0287 71
The electronic brake control module has received invalid serial data from the longitudinal accelerometer sensor.
C0287 4B
The longitudinal acceleration sensor is not calibrated.
Action Taken When the DTC Sets
One or more of the following actions may occur:
* The ABS indicator illuminates.
* The Stabilitrak indicator illuminates.
* A driver information center message and/or a warning indicator may be displayed.
* The electronic brake control module disables the antilock brake system, the traction control system, the hill start assist and the vehicle stability enhancement system for the duration of the ignition cycle.
Conditions for Clearing the DTC
* The condition for setting the DTC is no longer present and the ignition is cycled OFF then back to RUN.
* The electronic brake control module clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
Note:
During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the electronic brake control module. Do not replace the electronic brake control module for this condition.
If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps:
1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power, and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The electronic brake control module should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the electronic brake control module should request all telltale indicators to turn OFF.
Diagnostic Aids
Possible causes of this DTC are as follows:
* Internal failure in the yaw and lateral accelerometer sensor.
* The longitudinal accelerometer sensor is not calibrated.
* Incorrectly mounted or loose yaw and lateral accelerometer sensor.
Reference Information
Schematic Reference
Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
Description and Operation
ABS Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Testing
1. Verify that DTC U1826, C0292 or C0710 is not set.
• If the DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Verify that DTC C0287 4B is not set.
• If the DTC is set, refer to Vehicle Yaw Sensor Learn Testing and Inspection.
3. Inspect the yaw and lateral accelerometer sensor for correct installation.
• If loose or incorrect installation is diagnosed, correct the installation of the component.
4. Ignition OFF, disconnect the harness connector at the yaw and lateral accelerometer sensor.
5. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the ground circuit terminal 1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
6. Ignition ON, test for B+ between the 12 V reference circuit terminal 4 and ground.
• If not within the specified range, test the 12 V reference circuit for a short to ground or open/high resistance.
7. If all circuits test normal, replace the yaw and lateral accelerometer sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement Service and Repair