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 00: Pump Motor Circuit No Additional InformationDTC C0110 04 : Pump Motor Circuit Open Circuit
DTC C0110 07: Pump Motor Circuit Voltage Above Threshold
DTC 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 | - | 1 | - | - |
EBCM Battery Positive Voltage | - | 1 | - | - |
Pump Motor Circuit | - | C0110 04 | C0110 07 | C0110 61 C0110 00 |
1-Circuit Inoperative | ||||
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 ignition is 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.
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 and the Traction Control System (TCS) (JL9) 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 TRACTION CONTROL message. |
Conditions for Clearing the DTC
| • | The ABS indicator may remain illuminated after repairs are made and DTCS are cleared, until the vehicle is operated at speeds greater than 13 km/h (8 mph) and the self test is completed. |
| • | 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
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Testing
- Ignition OFF, disconnect the EBCM harness connector and connect a test lamp between the battery positive voltage circuit terminal, and to chassis ground.
- Verify that the test lamp illuminates.
- 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.
- 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.
- 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 the test lamp does not illuminate, repair the open or high resistance in the battery positive voltage circuit. |
| ⇒ | If the test lamp does not illuminate, repair the open or high resistance in the pump motor ground circuit. |
| ⇒ | If connector corrosion or damage is evident, replace BPMV and/or EBCM as necessary. |
| ⇒ | If brake fluid is present, replace both BPMV and EBCM. |
| ⇒ | 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.
| • | Control Module References for EBCM replacement, setup, and programming |
