Diagnostic Instructions
DTC Descriptors
DTC C0110 04 : Pump Motor Circuit Open Circuit
DTC C0110 61 : Pump Motor Circuit Actuator Stuck
Circuit/System Description
The electronic brake control module (EBCM) supplies ground to activate the Antilock Brake System (ABS) pump motor. An internal system relay in the EBCM supplies battery positive voltage to the pump motor when the ignition is turned ON. The EBCM monitors
pump motor feedback voltage after activation to detect a stalled or binding pump motor.
Conditions for Running the DTC
C0110 04
| • | System and ignition voltage is above 10.5 volts. |
| • | The system enable relay is ON. |
| • | The pump motor has been commanded OFF for 2.5 seconds. |
C0110 61
| • | The system enable relay is ON. |
| • | The pump motor has been commanded ON, OFF and ON again. |
Conditions for Setting the DTC
C0110 04
The EBCM detects an open in the pump motor circuit when the feedback voltage remains greater than 0.75 volt for more than 50 msec.
C00110 61
The pump motor continues to rotate briefly after activation creating a feedback voltage. The EBCM sets the code if the measured feedback voltage indicates a binding or stalled pump motor.
Action Taken When the DTC Sets
| • | The EBCM disables the ABS/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle. |
| • | A DIC message and/or a warning message may be displayed. |
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 pump motor is integral to the brake pressure modulator valve (BPMV). The pump motor is not serviceable.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
Circuit/System Testing
- Ignition OFF, disconnect the EBCM harness connector and connect a test lamp between the battery positive voltage circuit terminal going to the ABS pump motor, and to ground.
- Ignition ON, verify that the test lamp illuminates.
| ⇒ | If the test lamp does not illuminate, repair the open or high resistance in the battery positive voltage circuit. |
- Connect a test lamp between the battery positive voltage circuit and pump motor ground circuit at the EBCM connector, verify that the test lamp illuminates.
| ⇒ | If the test lamp does not illuminate, repair the open or high resistance in the pump motor ground circuit. |
- Ignition OFF, remove the EBCM from the BPMV.
- Inspect the EBCM to BPMV connector for conditions such as damage, corrosion, or presence of brake fluid.
| ⇒ | If connector corrosion or damage is evident, replace BPMV and/or EBCM as necessary. |
| ⇒ | If brake fluid is present, replace both BPMV and EBCM. |
- Connect the EBCM harness to the EBCM with the BPMV still separated.
- Connect a test lamp between the pump motor circuits, internal EBCM side.
- Ignition ON, use the scan tool to perform the Pump Motor Test.
| ⇒ | If test lamp illuminates replace the BPMV. |
| ⇒ | If test lamp does not illuminate replace the EBCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
