Antilock Brakes / Traction Control Systems

DTC C0896





Circuit Description

The electronic brake control module (EBCM) is required to operate within a specified range of voltage to function properly. During ABS and traction control system (TCS) operation, there are current requirements that will cause the voltage to drop. Because of this, voltage is monitored out of ABS/TCS control to indicate a good charging system condition, and also during ABS/TCS control when voltage may drop significantly. The EBCM also monitors for high voltage conditions which could damage the EBCM.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0896 System High/Low Voltage

Conditions for Running the DTC

* The ignition switch is ON.
* The DTC can be set after system initialization.

Conditions for Setting the DTC

* The EBCM operating voltage falls below 9.4 volts out of ABS/TCS control, or 9.2 volts during ABS/TCS control.
* The EBCM operating voltage rises above 16.9 volts.
* The low voltage or the high voltage is detected for more than 500 milliseconds with the vehicle speed above 6 km/h (3.6 mph).

Action Taken When the DTC Sets

If equipped, the following actions occur:

* A malfunction DTC is stored.
* The ABS indicator turns on.
* The ABS/TCS is disabled.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present and you used the scan tool Clear DTC function.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

* It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
* Thoroughly inspect any circuitry that may be causing the complaint for the following conditions:
^ Backed out terminals
^ Improper mating
^ Broken locks
^ Improperly formed or damaged terminals
^ Poor terminal-to-wiring connections
^ Physical damage to the wiring harness
* The following conditions may cause an intermittent malfunction:
^ A poor connection
^ Rubbed-through wire insulation
^ A broken wire inside the insulation
* If an intermittent malfunction exists, Refer to Testing for Intermittent Conditions and Poor Connections for further diagnosis. Component Tests and General Diagnostics

Test Description

The numbers below refer to the step numbers on the diagnostic table.
2. This step checks if the voltage is above the maximum of the range.
4. This step checks if the voltage is below the minimum of the range.
6. This step checks for the integrity of the ground circuit.

Step 1 - Step 9:

Step 10 - Step 11: