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| • | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
ABS Pump Motor Power Circuit | C0110 06 | C0110 04 | -- | -- |
ABS Pump Motor Ground Circuit | — | C0110 04 | -- | -- |
ABS Pump Motor Mechanical Fault | -- | -- | -- | C0110 61 |
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 antilock brake system (ABS) operation is required the EBCM activates the pump motor relay and a battery power is provided to the pump motor.
| • | The ignition is ON. |
| • | Initialisation is complete. |
| • | The test is initiated once per ignition cycle, when the vehicle speed is greater than 15 km/h (9 mph), and a fault was set on the last ignition cycle. |
| • | The vehicle speed is greater than 20 km/h (12.5 mph), and brake is not applied. |
The EBCM detects a low voltage in the pump motor supply circuit when the feedback voltage is less than 6 volts for more than 0.049 seconds, and the pump motor is not activated. The ground circuit is open, and the feedback voltage is greater than 4 volts for 0.5 seconds, the pump is not activated.
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.
| • | The EBCM disables the antilock brake system (ABS)/traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | The ABS indicator turns ON. |
| • | The condition for setting the DTC is no longer present. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles. |
| • | The DTC can be cleared using a scan tool. |
The pump motor is integral to the BPMV. The pump motor is not serviceable. Inspect the power and ground circuits for correct connection.
Antilock Brake System Schematics
Control Module References for scan tool information
Ignition ON, command the Pump Motor test with a scan tool and listen/feel the pump motor turns on.
| • | Terminal 13 |
| • | Terminal 38 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Terminal 25 |
| • | Terminal 1 |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuits test 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. |
| ⇒ | If test lamp does not illuminate, replace the EBCM. If the DTC resets, replace the BPMV. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
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