Diagnostic Instructions
DTC Descriptors
DTC C0131 00: ABS/TCS System Pressure Circuit Malfunction
DTC C0131 3A: ABS/TCS Pressure Circuit Incorrect Component Installed
DTC C0131 5A: ABS/TCS Pressure Circuit Plausibility Failure
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
Brake Pressure Sensor Signal Circuit
| C0131 00
| C0131 00
| C0131 00
| C0131 3A, 5A
|
Circuit/System Description
The electronic brake control module (EBCM) uses input from the brake pressure sensor for more accurate control during a Vehicle Stability Enhancement System (VSES) event.
Conditions for Running the DTC
| • | The ignition switch is in the ON position. |
| • | Ignition voltage is greater than 9.5 volts. |
Conditions for Setting the DTC
| • | Internal pressure sensor line fault. |
| • | 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. |
| • | After replacing the brake pressure sensor, a calibration procedure is required with a scan tool. |
Action Taken When the DTC Sets
| • | The EBCM disables the Antilock Brake System (ABS)/Traction Control System/(TCS) and VSES for the duration of the ignition cycle. |
| • | The ABS/TCS and stabilitrak indicator turns ON. |
| • | The Service Traction Control, and stabilitrak displayed on the DIC. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
| • | A DTC C0131 can set if the ECU is loosely attached to the hydraulic unit. The mountings should be checked for the proper torque. |
| • | The brake fluid pressure sensor is integral to the BPMV/EBCM. The brake fluid pressure sensor is not serviceable. After replacing the BPMV, and the DTC resets as a current code, it may be necessary to perform a brake pressure sensor calibration with
the Tech 2 in ABS, special function. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List for EBCM
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
- Apply and release brake pedal. Verify brake lamps operate properly. If brake lamps do not operate properly, refer to.
- 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 EBCM/BPMV assembly. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
