C: Reference Voltage (VREF) C: Introduction — 2016 workshop reference 4976

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.

• Visually inspect for:

◾ pushed out pins ◾ corrosion

• Connect all the PCM connectors and make sure they seat correctly.

• Carry out the PCM self-test.

• Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM), Programming the VID Block for a Replacement PCM.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Yes

INSTALL a new PCM.

REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM), Programming the VID Block for a Replacement PCM.

The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Source reference 4976

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.