C0273

DTC C0273:

DTC C0273

Circuit Description
The pump motor relay is part of the electronic brake control module (EBCM). The EBCM turns ON and OFF the pump motor relay as deemed necessary in order to activate the pump motor. The pump motor modulates brake hydraulic pressure during an antilock brake system (ABS) stop.

Conditions for Running the DTC
DTC C0273 can be set anytime the ignition switch is in the ON position.

Conditions for Setting the DTC
The electronic brake control module (EBCM) detects an open in the pump motor circuitry.

Action Taken When the DTC Sets
^ The ABS is disabled.
^ The ABS warning indicator turns ON.

Conditions for Clearing the DTC
^ The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
^ After the DTC is cleared, the ABS indicator will remain ON until the vehicle is road tested to verify the repair. Once the vehicle has been driven at a speed above 16 km/h (10 mph) for 20 seconds with no malfunctions present, the EBCM will turn OFF the ABS indicator.

Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
^ An open or high resistance in the battery positive voltage circuit
^ An open or high resistance in the motor ground circuit
^ An internal EBCM malfunction
If an intermittent malfunction exists, refer to Testing for Intermittent and Poor Connections in Symptoms. A Symptoms - Antilock Brake System

Test Description
The number below refers to the step number on the diagnostic table.
2. This step determines if the DTC is current.