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 Descriptors

DTC C0299 5A

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Brake Booster Pressure Sensor Performance Plausibility Failure

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

* Ignition ON.

* Engine Running.

* Ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

* No vacuum is detected in the power brake booster for approximately 10 seconds after start-up.

* Low vacuum is detected in the power brake booster for approximately 60 seconds or longer after start-up, or is detected while driving.

Action Taken when the DTC Sets

* The EBCM disables the active vacuum booster 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 100 consecutive drive cycles.

Reference Information

Schematic Reference

Hydraulic Brake Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

Brake Assist System Description and Operation (Vacuum Assist) Brake Assist System (Vacuum Assist)Brake Assist System Description and Operation (Hydraulic Assist) Brake Assist System (Hydraulic Assist)

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 for scan tool information

Circuit/System Testing

Verify DTC C0299 5A is not set.

If the DTC is set, repair the source of the vacuum leak. Refer to Brake Assist System Diagnosis (Hydraulic Assist) Brake Assist System Diagnosis (Hydraulic Assist)Brake Assist System Diagnosis (Vacuum Assist) Brake Assist System Diagnosis (Vacuum Assist)

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.