C1281
DTC C1281
Circuit Description
The master cylinder pressure sensor is part of the electronic brake control module (EBCM).
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C1281 Master Cylinder Pressure Sensor Signal
Conditions for Running the DTC
The vehicle speed is at least 7 km/h (4 mph).
Conditions for Setting the DTC
The EBCM detects an incorrect master cylinder pressure sensor voltage.
Action Taken When the DTC Sets
* The Antilock Brake System (ABS) warning indicator turns ON.
* The ABS is disabled.
* The vehicle stability control (VSC) warning indicator turns ON.
* The VSC is disabled.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
* An open, high resistance, or short in the stop lamp circuit to the EBCM.
* An internal EBCM malfunction
If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. Test the stop lamp circuit of the EBCM for a high resistance, an open, or a short to ground.
5. Test the stop lamp circuit of the EBCM for a short to voltage.
