For 1990-2009 cars

### Circuit Description

The isolation and prime valve solenoid circuits are supplied with battery power when the ignition is in the ON position. The electronic brake control module (EBCM) controls the valve functions by grounding the circuit when necessary.

### DTC Descriptors

This diagnostic procedure supports the following DTCs:

• | DTC C0141 LF TCS Solenoid/Motor #1 Circuit

• | DTC C0146 LF TCS Solenoid/Motor #2 Circuit

• | DTC C0151 RF TCS Solenoid/Motor #1 Circuit

• | DTC C0156 RF TCS Solenoid/Motor #2 Circuit

### Conditions for Running the DTC

• | The ignition switch is in the ON position.

• | The DTC can be set after system initialization.

### Conditions for Setting the DTC

The DTC will set when the EBCM detects one of the following internal to the EBCM only:

• | An open in the solenoid coil or circuit.

• | A short to ground in the solenoid coil or circuit.

• | A short to voltage in the solenoid coil or circuit.

### Action Taken When the DTC Sets

If equipped, the following actions occur:

• | The EBCM disables the ABS/TCS for the duration of the ignition cycle.

• | A malfunction DTC is set.

• | The TCS warning indicator turns ON.

• | The Red BRAKE Warning indicator could turn ON.

• | The ABS indicator could turn ON.

### Conditions for Clearing the DTC

• | Condition for DTC is no longer present and scan tool clear DTC function is used.

• | 100 ignition cycles pass with no DTCs detected.

### Diagnostic Aids

The solenoid valve circuit and the solenoid coil are internal to the EBCM. No part of the solenoid circuit is diagnosable external to the EBCM. The DTC sets when there is a malfunction in the solenoid circuit internal to the EBCM only.

### Test Description

The number below refers to step number on the Diagnostic Table.

1. This step determines if the DTC is current.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Component Connector End Views
1 | Did you perform the Diagnostic System Check -- Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Using a scan tool clear the DTC.
2. Remove the scan tool from the DLC.
3. Carefully drive the vehicle above 12 km/h (8 mph) for several minutes.
4. Turn the ignition switch to the OFF position.
5. Install a scan tool.
6. Turn the ignition switch to the ON position, engine off.
7. Using the scan tool in Diagnostic Trouble Codes, check for DTCs.

Did any one of the DTCs C0141-C0156 reset as a current DTC?

Go to Step 3

Go to Diagnostic Aids

3 | Replace the electronic brake control module (EBCM). Refer to Brake Pressure Modulator Valve Assembly Replacement . Is the repair complete? | Go to Step 4 | --
4 |

1. Use the 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 2

System OK