No | The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues. |
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Brake Booster Vacuum Sensor Faults
Refer to Wiring Diagrams Cell 42 for schematic and connector information.
Normal Operation and Fault Conditions
The brake booster vacuum pressure sensor receives a sensor supply voltage of 5 volts from the ABS module. The sensor is also grounded through the ABS module. The sensor uses the pressure differential between the atmosphere and the brake booster vacuum chamber to produce a return voltage signal to the ABS module between 0.2 volt and 4.9 volts. The ABS module uses other sensor inputs such as wheel speed, brake pedal and stability sensors to determine if the vehicle is stopping and at what rate of deceleration. This information is compared against the vacuum pressure sensor to determine the validity of the sensor signal and the working condition of the sensor itself.
DTC Fault Trigger Conditions
DTC | Description | Fault Trigger Conditions |
|---|---|---|
C0047:01 | Brake Booster Pressure Sensor: General Electrical Failure | This DTC sets when the signal returned by the sensor is above or below a predetermined limit. This is usually caused by a short to voltage, an open or an internal failure of the sensor. |
C0047:26 | Brake Booster Pressure Sensor: Signal Rate of Change Below Threshold | This DTC sets when the rate of change in the signal transmitted by the vacuum sensor does not match a predetermined threshold depending on the brake system pressure, or if a characteristic oscillation in the vacuum signal is not detected. A signal failure is reported when 3 valid braking cycles, within the same ignition cycle, have met the above criteria. This is usually caused by a failure in the sensor circuits, a vacuum leak in the brake booster, a mechanical failure of the brake booster or an internal failure of the vacuum sensor. |
C0047:27 | Brake Booster Pressure Sensor: Signal Rate of Change Above Threshold | This DTC sets when the rate of change in the signal transmitted by the vacuum sensor increases beyond a predetermined level when the brakes are not being applied. When this condition is detected, the ABS module starts a counter and monitors the rate of change, if the rate of change increases beyond the limit 3 times during this time period, this DTC sets. This is usually caused by a failure in the sensor circuits or an internal failure of the sensor. |
C1015:08 | Vacuum Supply: Bus Signal / Message Failure | This DTC sets in continuous memory and on-demand if the ABS module does not receive any data from the vacuum sensor or the ABS module receives invalid data from the vacuum sensor. |
C1B14:11 | Sensor Supply Voltage "A": Circuit Short to Ground | The ABS module supplies 5 volts to the brake booster vacuum sensor. The ABS module monitors this output and sets this DTC when the module detects a short to ground on the voltage supply circuit. |
C1B14:12 | Sensor Supply Voltage "A": Circuit Short to Battery | The ABS module supplies 5 volts to the brake booster vacuum sensor. The ABS module monitors this output and sets this DTC when the module detects a short to battery voltage on the voltage supply circuit. |
C1B15:1C Sensor Supply Voltage "B": Circuit Voltage Out of Range | The ABS module supplies 5 volts to the brake booster vacuum sensor. The ABS module monitors this output and sets this DTC once the module determines the output voltage is either above or below the specified voltage for a predetermined amount of time. |
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.