Diagnostic Instructions
DTC Descriptor
DTC C0110: Pump Motor Circuit
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
| • | The system and ignition voltage is between 10.5-17 volts. |
| • | The system enable relay is ON. |
| • | The pump motor has been commanded OFF for 2.5 seconds. |
C0110 07
| • | The system and ignition voltage is between 10.5-17 volts. |
| • | The system enable relay is ON. |
C0110 61
| • | DTC C0110 04 or 07 are not set. |
| • | The system enable relay is ON. |
| • | The pump motor has been commanded ON for 0.3 seconds. |
Conditions for Setting the DTC
C0110 04
The EBCM detects an open in the pump motor circuit when the voltage across the pump motor is between 10 and 90 percent of ignition voltage.
C0110 07
This code sets for a open in the pump motor driver circuit when the pump is commanded on and the following conditions exist.
| • | The voltage across the pump is less than 8 volts. |
| • | The voltage at the high side of the motor is greater than 9.25 volts. |
| • | The EBCM detects a open in the low side pump motor driver circuit. |
C0110 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
If equipped, the following actions occur:
| • | The EBCM disables the ABS/traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | The dynamic rear proportioning (DRP) is degraded. |
| • | The ABS indicator illuminates. |
| • | The vehicle dynamics caution (VDC) indicator illuminates. |
| • | The SERVICE STABILITRAK message is displayed on the driver information center (DIC). |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | 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 for Scan Tool Information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the EBCM.
- Test for less than 5 ohms of resistance between the ground circuits terminals E and F and ground.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
- Ignition ON, verify that a test lamp illuminates between the B+ circuits terminals A and B and ground.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test or replace the BPMV. |
- Ignition OFF, remove the EBCM from the BPMV.
- Inspect the EBCM to BPMV connector to insure there is no damage, corrosion, or presence of brake fluid.
| ⇒ | If connector corrosion or damage is evident, replace the BPMV and/or EBCM as necessary. |
| ⇒ | If brake fluid is present, replace both the BPMV and EBCM. |
- If all circuits test normal, replace the BPMV.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
