C0820

DTC C0820

Circuit Description

The electronic brake control module (EBCM) monitors the voltage level of the EBCMs case. If the voltage level is too high, damage may result in the system. When the EBCM detects a high voltage condition, the EBCM turns OFF the system relay which removes battery voltage from the solenoid valves and pump motor.

DTC Descriptors

This diagnostic procedure supports the following DTC:

DTC C0820 EBCM Case Voltage

This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description.





Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The case voltage is greater than 2 volts for 0.1 seconds.

Action Taken When the DTC Sets

If equipped, the following actions occur:

^ The EBCM disables the ABS/ACC/VSES for the duration of the ignition cycle.
^ The DRP and TCS are degraded.
^ The ABS indicator turns ON.
^ The Traction Control indicator turns ON.
^ The DIC displays the Service Stability System message.
^ The red Brake warning indicator turns ON.

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

Possible causes of this DTC are the following conditions:

^ Internal short in the pump motor.
^ External battery supply shorted to case.
^ Internal EBCM battery supply shorted to case.

The pump motor is integral to the BPMV. The pump motor is not serviceable.

Test Description

The number below refers to the step number on the diagnostic table.
3. Tests the ability of the EBCM to control the pump motor. If the test lamp illuminates, the pump motor circuit within the EBCM is good.

Step 1 - Step 9: