DD: Fuel Pressure, Fuel Rail Pressure (FRP) — 2016 workshop reference 4997

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.

• Access the PCM and monitor the FRP (VOLT) PID.

• While observing the PID, carry out the following:

◾ Tap on the sensor to simulate road shock ◾ Wiggle the sensor connector ◾ Wiggle, shake, and bend small sections of the wiring harness while working from the

sensor to the PCM

• Check the connector for damage or corrosion.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	INSTALL a new sensor in question. REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC. GO to Pinpoint Test HC . REFER to the Workshop Manual Section 303-14, Electronic Engine Controls. Clear the PCM DTCs. REPEAT the self-test.

Yes

REPAIR as necessary.

Clear the PCM DTCs. REPEAT the self-test.

INSTALL a new sensor in question. REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC. GO to Pinpoint Test HC . REFER to the Workshop Manual Section 303-14, Electronic Engine Controls.

Clear the PCM DTCs. REPEAT the self-test.

DD13 CHECK THE VREF AND SIGRTN CIRCUITS FOR AN OPEN

• Ignition OFF.

• FRPT Sensor connector disconnected.

• Ignition ON, engine OFF.

• Measure the voltage between:

( + ) FRPT Sensor Connector, Harness Side	( - ) FRPT Sensor Connector, Harness Side
VREF - Pin 3	SIGRTN - Pin 4

Is the voltage between 4.5 - 5.5 V?

Yes	No
GO to DD14 .	GO to Pinpoint Test C .

DD14 CHECK THE FRT CIRCUIT FOR AN OPEN

• Ignition OFF.

• PCM connector disconnected.

• Measure the resistance between:

( + ) FRPT Sensor Connector, Harness Side	( - ) PCM Connector, Harness Side
FRT - Pin 5	FRT

Is the resistance less than 5 ohms?

Yes	No
GO to DD15 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

Source reference 4997

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.