For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC C0299 00: Brake Booster PerformanceDTC C12FF: Brake Booster Performance
DTC C0299 31: Brake Booster Performance General Checksum Failure
Circuit/System Description
The electronic brake control module (EBCM) uses input from the brake master cylinder piston position sensor and the brake switch to determine when the brake pedal is being applied and with how much force. These inputs are used to determine the driver's braking intent which is used to the control amount of pressure applied to the wheels..
Conditions for Running the DTC
| • | Ignition ON. |
| • | The ignition voltage is greater than 10 volts. |
Conditions for Setting the DTC
| • | The brake pedal is sensed as applied for 6 minutes. |
| • | The vehicle speed is greater than 21 km/h (13 mph). |
Action Taken When the DTC Sets
| • | The EBCM disables the antilock brake system (ABS), traction control and the vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | A DIC message and/or a warning indicator may be displayed. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
C0299 00 and C12FF
Verify that DTC C0299 31 and C12FF are not set.
| ⇒ | If any of the DTCs are set perform the EBCM, module setup, BMC primary piston position relearn. |
C0299 31 and C12FF
Verify that DTC C0299 31 and C12FF are not set.
| ⇒ | If any of the DTCs are set perform the EBCM, module setup, BMC primary piston position relearn. If the DTCs reset replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming
