Diagnostic Instructions
DTC Descriptors
DTC C0131 00: Brake Fluid Pressure Sensor Circuit Malfunction
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
Brake Fluid Pressure Sensor Signal Circuit
| C0131 00
| C0131 00
| C0131 00
| --
|
Circuit/System Description
The electronic brake control module (EBCM) uses input from the brake pressure
sensor for more accurate control during an electronic brake assist (EBA) or electronic
stability program (ESP) event.
Conditions for Running the DTC
| • | Ignition voltage is greater than 8 volts. |
Conditions for Setting the DTC
| • | Pressure signal does not correlate to estimated pressure over time. |
| • | Brake Signal does not correlate to pressure signal. |
| • | Signal is erratic and changes faster than physically allowed. |
Action Taken When the DTC Sets
| • | The EBCM disables the Electronic Stability Control (ESP) for the duration
of the ignition cycle. |
| • | The multi function display (MFD) displays the Stability Ctrl Off message. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | The DTC can be cleared using a scan tool. |
Diagnostic Aids
The brake fluid pressure sensor is integral to the brake modulator assembly/EBCM.
The brake fluid pressure sensor is not serviceable independently.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Scan Tool Reference
Control Module References
Circuit/System Verification
With scan tool installed, clear the DTCs then drive the vehicle in a straight
line at a speed greater than 20 km/h (13 mph). If the DTC did not set
as a current DTC see diagnostic aids.
Circuit/System Testing
Important: If DTC B3445 is set to current diagnose it
first. Refer to
DTC B3445
.
- Apply and release brake pedal. Verify brake lamps operate correctly. If
brake lamps do not operate correctly, refer to
Symptoms - Lighting Systems
.
- Test the stop lamp supply voltage circuit for a short to voltage, short
to ground, an open or high resistance.
| ⇒ | If the stop lamp circuit tests normal, replace the brake modulator assembly/EBCM. |
Repair Instructions
