C0299

DTC C0299

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0299 56
- Brake Booster Large Vacuum Leak Detected Too Many Transitions

Diagnostic Fault Information






Circuit/System Description

The brake booster vacuum sensor measures the vacuum in the brake booster assembly. The electronic brake control module (EBCM) supplies a 5 V reference and a low reference circuit to the brake booster vacuum sensor. The vacuum sensor supplies a voltage signal in relation to the pressure in the brake booster to the EBCM.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

The EBCM detected a too low vacuum in the brake booster assembly for 120 s.

Action Taken When the DTC Sets

The brake warning indicator turns ON.

Conditions for Clearing the DTC

* A current DTC clears when the diagnostic runs and passes.

* The EBCM will turn OFF the indicator in the next ignition cycle.

Reference Information

Schematic Reference

Hydraulic Brake Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left (DH6)

Description and Operation

Brake Assist System Description and Operation Brake Assist System

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References

Circuit/System Testing

1. Ignition ON.

2. Verify that DTC C1100 is not set.

• If the DTC is set
Refer toDTC C1100 C1100.

• If the DTC is not set

3. Inspect the brake booster vacuum system for damage, leakage and correct installation.

• If damage, leakage or incorrect installation is found
Refer to Brake Assist System Diagnosis Component Tests and General Diagnostics.

• If the inspection is OK

4. Replace the B19B Brake Booster Vacuum Sensor.

5. Verify the DTC does not set while operating the vehicle under the Conditions for Running the DTC.

• If the DTC sets
Replace the K17 Electronic Brake Control Module.

• If the DTC does not set

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Control Module References for electronic brake control module replacement, programming and setup