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 5A: Brake Booster Performance PlausibilityCircuit/System Description
The electronic brake control module (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 3-5 minutes after engine running.
Action Taken When the DTC Sets
A DIC message and/or a warning message may be displayed.
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
When C0299 is set as current, you may feel brake pedal pulsation due to optimized hydraulic braking activations.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify that DTC C1100 is not set.
- Verify that a vacuum leak is not present, refer to Brake Assist System Diagnosis.
| ⇒ | If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
