C: Reference Voltage (VREF) C: Introduction — 2016 workshop reference 4961

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.

( + ) ETBTPS Connector, Harness Side ( - ) ETCREF Ground

Original table alignment retained · Scroll horizontally if needed

• For APPVREF concerns.

• Measure the voltage between:

( + ) APP Sensor Connector, Harness Side	( - )
APPVREF1	Ground
APPVREF2	Ground

• For VREF concerns.

• Measure the voltage between:

( + ) Suspect Sensor Connector, Harness Side	( - )
VREF	Ground

Is the voltage between 4.5 - 5.5 V?

Yes	No
GO to C30 .	GO to C3 .

C3 CHECK THE REFERENCE VOLTAGE WITH ALL SENSORS DISCONNECTED

Note: Refer to the Sensors Connected To Reference Voltage Chart at the beginning of this pinpoint test and the Wiring Diagrams Manual Electronic Engine Controls Cell to identify the sensors connected to VREF, ETCREF and APPVREF.

• Ignition OFF.

• Disconnect all of the sensors connected to the reference voltage circuits.

• Ignition ON, engine OFF.

• Measure the voltage at the sensor disconnected in C1.

• For ETCREF concerns.

• Measure the voltage between:

( + ) ETBTPS Connector, Harness Side	( - )
ETCREF	Ground

• For APPVREF concerns.

• Measure the voltage between:

( + ) APP Sensor Connector, Harness Side	( - )
APPVREF1	Ground
APPVREF2	Ground

• For VREF concerns.

• Measure the voltage between:

Source reference 4961

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.