C0287

DTC 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 C0287 0F
- Longitudinal Acceleration Sensor Circuit Erratic

DTC C0287 55
- Longitudinal Acceleration Sensor Circuit Expected Number of Transition/Events Exceeded

DTC C0287 5A
- Longitudinal Acceleration Sensor Circuit Plausibility Failure

Circuit/System Description

The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one yaw/lateral accelerometer sensor, external to the electronic brake control module (EBCM). The EBCM supplies a 12 V reference voltage to the yaw/lateral accelerometer sensor. The vehicle stability enhancement system uses the longitudinal accelerometer input when calculating the desired yaw rate. The usable output signal is sent by the serial data CAN circuits to the EBCM. The EBCM activates the stability control function depending on the yaw/lateral accelerometer sensor input, the steering angle sensor signal and the vehicle speed.

Conditions for Running the DTC

* Ignition ON
* Ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

C0287 0F

The yaw/lateral accelerometer sensor is not mounted properly.

C0287 55

The longitudinal acceleration sensor signal does not change.

C0287 5A

The longitudinal acceleration sensor signal is not plausible with the yaw rate sensor signal, steering angle sensor signal and vehicle speed.

Action Taken When the DTC Sets

* The EBCM disables the stability control for the duration of the ignition cycle.
* The traction control/stability control-active indicator turns ON.

Conditions for Clearing the DTC

* A current DTC clears when the diagnostic runs and passes.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Diagnostic Aids

Possible causes of this DTC are as follows:

* Incorrectly mounted or loose yaw/lateral accelerometer sensor
* Internal failure in the yaw/lateral accelerometer sensor

Reference Information
Schematic Reference

Antilock Brake System Schematics
Connector End View Reference

Component Connector End Views Connector Views
Description and Operation

ABS 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 Control Module References for scan tool information

Circuit/System Testing

1. Ignition ON, verify that DTC U1826, C0186, C0196 or C0292 is not set.

• If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

2. Inspect the yaw/lateral accelerometer sensor for correct installation.

• If loose or incorrect installation is diagnosed, correct the installation of the component.

3. Ignition OFF, disconnect the harness connector at the yaw/lateral accelerometer sensor.
4. 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 ohm between the ground circuit terminal 6 and ground.

• If greater than the specified value, test the ground circuit for an open/high resistance.

5. Ignition ON, test for greater than 11 V between the 12 V reference circuit terminal 1 and ground.

• If less than the specified value, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.

6. If all circuits test normal, replace the yaw/lateral accelerometer sensor and verify the DTC does not reset.

• If the DTC resets, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement
* Control Module References Control Module References for EBCM replacement, programming and setup