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 Descriptor
DTC C0110 04: Pump Motor Circuit OpenDTC C0110 61: Pump Motor Circuit Actuator Stuck
Diagnostic Fault Information
Circuit | Short to Ground | Open or High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Pump Motor Ground | -- | C0110 04 | -- | -- |
Pump Motor | -- | -- | -- | C0110 61 |
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
| • | DTC C0110 04 is not set. |
| • | 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 voltage across the pump motor is between 10 and 90 percent of ignition voltage.
C0110 61
The pump motor is constantly being commanded on and off to when a certain motor RPM is desired. The feedback voltage is monitored and if the RPM is detected below the specified value for 4 consecutive attempts a binding or stalled pump motor fault is set.
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. |
| • | The dynamic rear proportion (DRP) is degraded. |
| • | The ABS indicator turns illuminates. |
| • | The stability control indicator illuminates. |
| • | The traction control indicator illuminates. |
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
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 circuit terminal E and ground.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminals A and B and ground.
- Ignition OFF, remove the EBCM from the BPMV.
- Inspect the EBCM to BPMV connector for no damage, corrosion, or presence of brake fluid.
- If all circuits test normal, replace the BPMV.
| ⇒ | 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, test or replace the BPMV. |
| ⇒ | If connector corrosion or damage is evident, replace BPMV and/or EBCM as necessary. |
| ⇒ | If brake fluid is present, replace both BPMV and EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
