Diagnostic Instructions
DTC Descriptors
DTC C0110 04: Pump Motor Circuit Open Circuit
DTC C0110 61: Pump Motor Circuit Actuator Stuck
Circuit/System Description
The pump motor is an integral part of the brake pressure modulator valve (BPMV), while the pump motor relay is integral to the electronic brake control module (EBCM). The pump motor relay is not engaged during normal system operation. When Antilock Brake
System (ABS) operation is required the EBCM activates the pump motor relay and battery power is provided to the pump motor.
Conditions for Running the DTC
C0110 04
| • | The ignition switch is in the ON position. |
| • | Initialization is complete. |
C0110 61
| • | The test is initiated once per ignition cycle, when the vehicle speed is greater than 8 km/h (5 mph), and a fault was set on the last ignition cycle. |
| • | The vehicle speed is greater than 20 km/h (13 mph), and the brake is not applied. |
| • | The vehicle speed is greater than 40 km/h (26 mph). |
Conditions for Setting the DTC
C0110 04
The EBCM detects a low voltage in the pump motor supply circuit when the feedback voltage is less than 6 volts for more than 1.8 seconds, and the pump motor is not activated. The ground circuit is open, and the feedback voltage is greater
than 0.93 volt for 1.8 seconds, the pump is not activated.
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 for the duration of the ignition cycle. |
| • | The ABS 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 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 BPMV. The pump motor is not serviceable. Inspect the power and ground circuits proper connections.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Description and Operation Reference
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List
for EBCM
Circuit/System Verification
With scan tool installed, clear the DTCs then drive the vehicle in a straight line at a speed greater than 20 km/h (13 mph). If the DTC did not set as a current DTC see diagnostic aids.
Circuit/System Testing
- With the 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. It is important that the test lamp is connected before the ignition
is turned ON.
- With the 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. |
- With ignition OFF, separate 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, the internal EBCM connector.
- With 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 and BPMV. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
