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.
DI7 CHECK FOR A SHORT BETWEEN THE INJ AND INJRTN CIRCUITS
• Measure the resistance between:
( + ) INJ Connector, Harness Side | ( - ) INJ Connector, Harness Side |
|---|---|
INJ | INJRTN |
Is the resistance greater than 10K ohms?
Yes | No |
|---|---|
GO to DI8 . | REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. |
DI8 CHECK THE RESISTANCE OF THE FUEL INJECTOR
• Measure the resistance between:
( + ) INJ Connector, Component Side | ( - ) INJ Connector, Component Side |
|---|---|
INJ | INJRTN |
Is the resistance between 1 - 2 ohms?
Yes | No |
|---|---|
GO to DI9 . | INSTALL a new Fuel Injector. REFER to the Workshop Manual Section 303-04, Fuel Charging and Controls. RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM). REPEAT the self-test. |
DI9 CARRY OUT A THOROUGH WIGGLE TEST ON THE FUEL INJECTOR HARNESS
• Ignition OFF.
• INJ connector connected.
• PCM connector connected.
• Ignition ON, engine running.
• Engine at normal operating temperature.
• Access the PCM and monitor the INJ_F (MODE) PID.
• Wiggle, shake, and bend small sections of the wiring harness while working from the suspected fuel injector to the PCM.
Does the INJ_F PID indicate a concern?
Yes | No |
|---|---|
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test. | For Relative Fuel Injector Test results indicating a fuel injector concern, INSTALL a new fuel injector as necessary. REFER to the |
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.