Diagnostic Instructions
DTC Descriptor
DTC C1100 : Base Brake System Pressure Sensor 2
Circuit/System Description
The electronic brake control module (EBCM) uses an input from 2 brake fluid pressure sensors to enhance Antilock Brake System (ABS) braking and vehicle stability if equipped.
Conditions for Running the DTC
| • | The ignition is ON for 1 second and greater than 8 volts. |
| • | The 5-volt reference to the brake pressure sensor is in range. |
Conditions for Setting the DTC
The 2 master cylinder pressure sensors do not correlate.
Action Taken When the DTC Sets
If equipped, the following actions will occur:
| • | The EBCM disables the Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle. |
| • | The EBCM disables the Traction Control System (TCS) for the duration of the ignition cycle. |
| • | The EBCM disables the TCS for the duration of the ignition cycle. |
| • | The driver information center (DIC) displays the Service Stability System and Service Traction System message. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
| • | The brake pressure sensors are internal to the EBCM assembly and cannot be diagnosed or replaced separately. If equipped, the primary and secondary brake pressure sensor 5-volt reference circuit and low reference is shared with other components in
the vehicle stability system. DTCs can set for other components that share circuits with the secondary brake pressure sensor. |
| • | DTC C0870 is set if the 5-volt reference voltage is out of range. |
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
Circuit/System Testing
Important: If DTC C0870 is set, diagnosis it before performing this diagnostic.
Verify DTC C1100 is not set.
| ⇒ | If DTC is set, replace the Brake Pressure Modulator Valve.If DTC resets replace the EBCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
