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 Descriptor
DTC C0299: Brake Booster PerformanceDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Brake Booster Vacuum Sensor | -- | -- | -- | C0299 |
Circuit/System Description
The EBCM monitors the vacuum level in the power brake booster, and will set a DTC if the vacuum is too low.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Ignition voltage is greater than 9 volts. |
| • | The engine is running for the vacuum related fault to set. |
Conditions for Setting the DTC
| • | A condition in which no vacuum is detected in the power brake booster for approximately 10 seconds after start-up. |
| • | A condition in which low vacuum is detected in the power brake booster for approximately 60 seconds or longer after start-up, or is detected while driving. |
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. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
- Verify that a vacuum leak is not present, refer to Brake Assist System Diagnosis .
- Verify that the following DTC is not set: C1100.
| ⇒ | If the DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle . |
