Normal Operation and Fault Conditions
WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The ABS module uses a pressure sensor located inside the HCU to monitor the integrity of the hydraulic system. When the brake pedal is pressed, the ABS module compares the value of the brake fluid line pressure sensor to the BOO switch input from the PCM over the HS-CAN. If the brake fluid pressure sensor value is not comparable to the BOO switch input, the ABS module sets one or more DTCs.
DTC DESCRIPTION
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C1A99:01 | Pressure Sensor: General Electrical Failure | This DTC indicates the brake fluid line hydraulic pressure sensor located inside the HCU has failed. |
| C1A99:28 | Pressure Sensor: Signal Bias Level Out of Range/Zero Adjustment Failure | This DTC indicates the brake fluid line hydraulic pressure sensor located inside the HCU has failed. |