For 1990-2009 cars

### Circuit Description

Ground is continuously supplied to the low side of the ABS pump motor. The EBTCM activates the ABS pump motor by energizing the pump motor relay, allowing battery voltage to the high side of the motor.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

The EBCM detects an open or shorted pump motor circuit, or a fault in the pump motor relay.

### Action Taken When the DTC Sets

• | The ABS telltale will be on.

• | The ABS control module will disable the ABS, the TCS and the DRP.

### Conditions for Clearing the DTC

The Conditions for Setting the DTC are no longer present and you use the scan tool Clear DTCs function.

### Diagnostic Aids

The pump relay and motor are NOT serviceable.

The valve assembly (with control module) must be replaced.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views
1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - ABS
2 | Use a scan tool in order to clear the DTCs. Does the DTC reset? | Go to Step 3 | Go to Diagnostic Aids
3 |

1. Separate the EBCM from the BPMV. Refer to Electronic Brake Control Module Replacement .
2. Inspect for poor connections at the pump motor connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 5

Go to Step 4

4 | Important: New ABS control modules will automatically set DTC C0551 when installed. To clear DTC C0551, new modules must be configured with the correct engine and transmission option bit. Refer to Electronic Brake Control Module Replacement Replace the EBCM and the BPMV. Refer to Electronic Brake Control Module Replacement and Brake Pressure Modulator Valve Replacement .

Did you complete the replacements?

Go to Step 5

--

5 |

1. Use a scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 3

System OK