For 1990-2009 cars

### 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
DTC C0110 61: Pump Motor Circuit Actuator Stuck

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
B+ | C0110 00 | C0110 00 | -- | C0110 61*
Ground | -- | C0110 00 | -- | C0110 61*
* Relay or Pump Mechanically Stuck

### 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 00

• | Ignition ON.

• | Initialization is complete.

#### C0110 61

• | The test is initiated once per ignition cycle, when the vehicle speed is greater than 8 km/h (5 mph), and a fault was set on the last ignition cycle.

• | The vehicle speed is greater than 20 km/h (13 mph), and the brake is not applied.

• | The vehicle speed is greater than 40 km/h (26 mph).

### Conditions for Setting the DTC

#### C0110 00

The EBCM detects a short to ground or an open/high resistance on the B+ circuit or the ground circuit.

#### C0110 61

The EBCM detects the pump does not run when the relay is energized.

### 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 EBCM sends a serial data message to illuminate the appropriate warning indicator/message.

### Conditions for Clearing the DTC

• | The condition for the DTC is no longer present.

• | The EBCM 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 BPMV, and the pump motor relay integral to the EBCM.

### Reference Information

#### Schematic Reference

Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

ABS Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Ignition ON, perform the Pump Motor Test with a scan tool and listen/feel for the relay clicking and the Pump to turn ON and OFF.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for less than 5 ohms between the ground circuit terminal 26 and ground.

⇒ | If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 14 and ground.

⇒ | 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 ABS pump circuit fuse is open, test or replace the BPMV.

4. If all circuits test normal, replace the EBCM. If the DTC resets, replace the BPMV.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Brake Pressure Modulator Valve Replacement

• | Control Module References for EBCM replacement, setup, and programming