C0243
DTC C0243
Circuit Description
The electronic brake control module (EBCM) sends a engine drag control (EDC) request via a dedicated data line. The powertrain control module (PCM) supplies a pull up voltage of 5 volts that the EBCM switches to ground to create the signal.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0243 Engine Drag Control
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The EBCM receives a serial data message from the PCM indicating that the EDC circuit has failed.
Action Taken When the DTC Sets
* The EBCM disables the EDC for the duration of the ignition cycle.
* The driver information center (DIC) displays the Service Stability System message.
* The Antilock Brake System (ABS)/Traction Control System (TCS) remains functional.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
* The 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:
* An open in the EDC control circuit.
* An short to ground or voltage in the EDC control circuit.
* A wiring problem, terminal corrosion, or poor connection in the EDC control circuit.
Test Description
The number below refers to the step number on the diagnostic table.
9. This vehicle is equipped with a ECM which uses an electrically erasable programmable read only memory (EEPROM). When replacing the ECM, the replacement ECM must be programmed.
