Diagnostic Instructions
DTC Descriptor
DTC C0110 : Pump Motor Circuit
Circuit/System Description
The ABS pump motor recharges the brake fluid accumulator during antilock braking and normal power brake assist. The ABS pump motor is part of the hydraulic brake booster assembly.
Conditions for Running the DTC
Ignition voltage is greater than 9.5 volts.
Conditions for Setting the DTC
| • | The ABS pump runs continuously for 178 seconds. |
| • | The EBCM detects an open in the pump motor circuit when the pump motor is activated. |
Action Taken When the DTC Sets
| • | EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle. |
| • | ABS indicator turns ON. |
| • | Brake warning indicator turns ON. |
| • | Driver information center (DIC) displays the SERVICE ABS/TRACTION System message. |
| • | DIC displays the SERVICE STAB SYS message. |
| • | An ECE 13 response may occur. |
| • | ABS pump motor runs intermittently, 2 seconds on and 8 seconds off. |
Conditions for Clearing the DTC
| • | The condition for setting 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. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List
Circuit/System Verification
With the scan tool, access the ABS special functions menu and perform the ABS Motor test. The pump motor should function and no DTCs should be set.
Circuit/System Testing
- With the ignition OFF, disconnect the main EBCM harness connector (C2) an the small 4-way EBCM harness connector (C1). At both EBCM harness connectors, test for 12 volts on the battery positive voltage circuits.
| ⇒ | If the voltage is below 10 volts, repair open or short to ground on the battery positive voltage circuit. |
- Connect one end of a test lamp to battery positive voltage. At the EBCM connector, touch the other end of the test lamp to each of the 3 ground circuits. The test lamp should illuminate.
| ⇒ | If the test lamp does not illuminate when touched to each ground circuit, repair open in the suspected ground circuit. |
- Remove the 2 small rubber caps that cover the ABS pump motor connections to the EBCM. Connect a test lamp between the two terminals located under the rubber plugs. Turn the ignition ON. Use the scan tool to command the ABS pump motor ON.
| ⇒ | If the test lamp illuminates, replace the hydraulic brake booster. |
| ⇒ | If the test lamp does not illuminate, replace the EBCM/BPMV assembly. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
