Normal Operation and Fault Conditions
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
The brake booster vacuum 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.
PPT C PCM DTC FAULT TRIGGER CONDITIONS
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0555 | Brake Booster Pressure Sensor Circuit | This DTC sets due to differences between the brake booster mounted vacuum sensor signal and the PCM calculated vacuum level. This DTC does not illuminate any warning indicators nor are there any associated service messages. |
| P0556 | Brake Booster Pressure Sensor Circuit Range/Performance | This DTC sets due to differences between the brake booster mounted vacuum sensor signal and the PCM calculated vacuum level. This DTC does not illuminate any warning indicators nor are there any associated service messages. |
| P0557 | Brake Booster Pressure Sensor Circuit Low | This DTC sets due to differences between the brake booster mounted vacuum sensor signal and the PCM calculated vacuum level. This DTC does not illuminate any warning indicators nor are there any associated service messages. |
| P0558 | Brake Booster Pressure Sensor Circuit High | This DTC sets due to differences between the brake booster mounted vacuum sensor signal and the PCM calculated vacuum level. This DTC does not illuminate any warning indicators nor are there any associated service messages. |
| P0559 | Brake Booster Pressure Sensor Circuit Intermittent | This DTC sets due to differences between the brake booster mounted vacuum sensor signal and the PCM calculated vacuum level. This DTC does not illuminate any warning indicators nor are there any associated service messages. |