Pinpoint Test Ah: Stability Control Sensor Signal Failure Faults
Normal Operation and Fault Conditions
The ABS module uses a vacuum sensor to monitor the brake booster vacuum.
On 2.0L EcoBoost engines, a camshaft driven vacuum pump supplies the vacuum to the brake booster. The vacuum pump is expected to produce at least 600 mBar (18 In-Hg). A leak in a vacuum hose, brake booster or one of the seals on the brake booster or vacuum pump prevents the vacuum pump from achieving the required amount of vacuum. Damage or an internal failure also prevents the vacuum pump from operating at peak capacity.
On all other engines, the engine supplies the vacuum to the brake booster through a series of hoses and tubes. A leak in a vacuum hose, tube, brake booster or one of the seals on the brake booster or vacuum pump prevents the brake booster from achieving the required amount of vacuum.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS C1015:7A | Vacuum Supply: Fluid Leak Or Seal Failure | Sets when the ABS module detects a decrease in brake booster vacuum without brake system activation. |
| ABS C1015:7B | Vacuum Supply: Low Fluid Level | Sets when the ABS module detects the brake vacuum pump or engine is unable to produce the vacuum necessary for brake system operation. |
Possible Sources
- Vacuum leak
- Vacuum hose obstruction
- Vacuum pump (if equipped)
- Brake booster