Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC C0110 03: Pump Motor Circuit Voltage Below ThresholdDTC C0110 04: Pump Motor Circuit Open Circuit
DTC C0110 61: Pump Motor Circuit Actuator Stuck
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ Terminal 13 | C0110 03 | C0110 04 | -- | C0110 61 |
Ground Terminal 1 | -- | C0110 04 | -- | C0110 61 |
Ground Terminal 25 | -- | C0110 04 | -- | C0110 61 |
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 the antilock brake system (ABS) or traction control system (TCS) operation is required the EBCM activates the pump motor relay and turns the pump motor ON.
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 03 or C0110 61
| • | Ignition ON. |
| • | 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.
C0110 03 or 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
| • | The EBCM disables the ABS/TCS/vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | The ABS indicator turns ON. |
| • | The Traction Control indicator turns ON. |
| • | The driver information center (DIC) displays the Service Stability System message. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | Operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test, and the EBCM will turn off the ABS indicator. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
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 1 ohm between the ground circuits listed below and ground.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit Terminal 13 and ground.
- If all circuits test normal, replace the BPMV and verify DTC does not reset. If the DTC resets replace the EBCM.
| • | Terminal 25 |
| • | Terminal 1 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | 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, replace the BPMV. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
