Possible Causes
Visual Inspection and Diagnostic Pre-checks
Inspect the brake booster for vacuum leaks. Inspect the brake booster for any obvious signs of damage. Inspect the brake booster vacuum sensor harness and connector of any obvious signs of damage. Make sure the brake booster vacuum sensor electrical connector is free from any corrosion or other contaminants.
PINPOINT TEST M : BRAKE BOOSTER VACUUM SENSOR FAULTS
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector
M1 VERIFY ALL WIRING CONNECTIONS
Ignition OFF. Disconnect ABS module C135. Disconnect brake booster vacuum sensor C1609. Using a good light source, inspect each connector terminal for any corrosion. Inspect both connectors for any pushed-out pins. Refer to Wiring Diagrams Cell 5 for schematic and connector information. Using a suitable mating terminal, check each female terminal for deformed or enlarged contacts by comparing the mating terminal's fit between each of the following pins:
C135-36 C135-44 C135-45 C1609-1 C1609-2 C1609-3
Are both connectors free of corrosion, pushed-out pins and deformed or enlarged contacts?
Yes | GO to M2 |
|---|---|
No | REPAIR the affected terminal. |
M2 CHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
Connect ABS module C135. Connect brake booster vacuum sensor C1609. Ignition ON. Using a diagnostic scan tool, carry out the ABS module self-test.
Is DTC C0047:26 present?
Yes | GO to M3 |
|---|---|
No | For DTC C0047:01, C0047:27, C1B14:11, C1015:08, C1B14:12 or C1B15:1C, GO to M4 For all other ABS module codes, GO to the DTC Chart: ABS Module. |
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.