Is DTC U0131:00 or U0420:xx set in 1 or more modules in addition to the ABS module?
Yes | CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, REFER to the EPAS symptom chart or DTC chart. Click here to access Guided Routine (EPAS). | |
|---|---|---|
No | CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new ABS module. REFER to: Anti-Lock Brake System (ABS) Module (206-09 Anti-Lock Brake System (ABS) and Stability Control, Removal and Installation). | |
C1015:7A, C1015:7B
Refer to Wiring Diagrams Cell 42 for schematic and connector information.
Normal Operation and Fault Conditions
The ABS module uses the brake booster vacuum sensor to monitor the brake booster vacuum. On vehicles equipped with a 2.3L EcoBoost engine, a gear driven vacuum pump supplies the necessary vacuum to the brake booster. The vacuum pump is expected to produce at least 600 mBar (18 In-Hg). On vehicles equipped with all other engines, the engine supplies the necessary vacuum to the brake booster. A leak in a vacuum hose, brake booster, brake booster seal or vacuum pump (if equipped) prevents the brake booster from maintaining the required amount of vacuum. Damage or an internal failure prevents the vacuum pump from operating at peak capacity.
DTC Fault Trigger Conditions
DTC | Description | Fault Trigger Conditions |
|---|---|---|
C1015:7A Vacuum Supply: Fluid Leak or Seal Failure | This DTC sets when the ABS module detects a decrease in brake booster vacuum without brake system activation. | |
C1015:7B Vacuum Supply: Low Fluid Level | This DTC sets when the brake vacuum pump or engine is unable to produce the vacuum necessary for brake system operation. |
Possible Causes
Vacuum leak Vacuum hose obstruction Vacuum pump (if equipped) Brake booster
PINPOINT TEST R : C1015:7A, C1015:7B
R1 CHECK FOR VACUUM LEAKS
Start the engine. For vehicles equipped with a 2.3L EcoBoost engine, inspect the vacuum hose and each hose connection from the vacuum pump to the brake booster for leaks. For vehicles equipped with all other engines, inspect the vacuum hose and each hose connection from the engine to the brake booster for leaks.
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.