C0870

DTC C0870
Circuit Description
The electronic brake control module (EBCM) supplies voltage to the brake pressure sensor, steering angle sensor, and yaw rate/lateral accelerometer sensor. This voltage is monitored by the EBCM for an over or under voltage condition.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0870 Device Voltage Reference Output Circuit

Conditions for Running the DTC
^ The ignition is ON.
^ Ignition voltage is greater than 8 volts.

Conditions for Setting the DTC
One of the follow conditions exists for 0.1 seconds:
^ The sensor supply voltage is greater than 5.2 volts.
^ The sensor supply voltage is less than 4.8 volts.

Action Taken When the DTC Sets
^ The EBCM disables the VSES for the duration of the ignition cycle.
^ ACC braking function disabled.
^ TCS is degraded.
^ The Traction Control and Active Handling indicator turns ON.
^ The DIC displays the Service Active Handling message.

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
^ The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
The following conditions can cause this concern:
^ The sensor supply circuit is open, shorted to ground, or shorted to battery.
^ Internal sensor malfunction.
^ Internal EBCM malfunction.








Test Description
The numbers below refer to the step numbers on the diagnostic table.
5. This step tests for a short at the brake pressure sensor.
6. This step tests for a short at the steering wheel position sensor.
7. This step tests for a short at the yaw rate/lateral accelerometer sensor.