Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
Original table alignment retained · Scroll horizontally if needed
C28 CHECK THE REFERENCE VOLTAGE WITH THE BRAKE VACUUM SENSOR CONNECTED
Note: If the vehicle is not equipped with a brake vacuum sensor or if this sensor was used for the VREF measurement in C3, GO to C29 .
Note: Only measure the circuits that apply to the vehicle being diagnosed.
• Ignition OFF.
• Brake Vacuum Sensor connector connected.
• Ignition ON, engine OFF.
• Measure the voltage between:
( + ) Suspect Sensor Connector, Harness Side | ( - ) |
|---|---|
VREF | Ground |
Is the voltage between 4.5 - 5.5 V?
Yes | No |
|---|---|
GO to C29 . | INSTALL a new Brake Vacuum sensor. Clear the PCM DTCs. REPEAT the self-test. |
C29 CHECK THE REFERENCE VOLTAGE WITH THE FTP SENSOR CONNECTED
• Ignition OFF.
• FTP Sensor connector connected.
• Ignition ON, engine OFF.
• Measure the voltage between:
( + ) Suspect Sensor Connector, Harness Side | ( - ) |
|---|---|
VREF | Ground |
Is the voltage between 4.5 - 5.5 V?
Yes | No |
|---|---|
The concern is intermittent. GO to Pinpoint Test Z . | INSTALL a new FTP sensor. REFER to the Workshop Manual Section 303-13, Evaporative Emissions. Clear the PCM DTCs. REPEAT the self-test. |
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.