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.
HD14 CHECK FOR BASE ENGINE CONCERNS
• This step determines if there are any base engine concerns that may have caused the misfire DTC or drive concern.
• Ignition OFF.
• Carry out the following tests in order to evaluate base engine integrity:
◾ For vehicles equipped with mechanically driven cooling fans only, rotate the cooling fan by
hand. The cooling fan should rotate freely, with no abnormal binding or interference. If binding or interference is present, remove any foreign materials or repair the cooling fan as necessary.
◾ Refer to the Workshop Manual Section 303-05, Accessory Drive and carry out checks in
the Visual Inspection Chart.
◾ Refer to the Workshop Manual Section 303-00, Engine System and carry out the
Compression Test and Cylinder Leakage Detection.
◾ Refer to the Workshop Manual Section 303-00, Engine System and carry out the Valve
Train Analysis.
◾ Visually inspect the positive crankcase ventilation (PCV) valve and tube for leaks. ◾ Refer to the Workshop Manual Section 303-00, Engine System and carry out Component
Tests.
Is a concern present?
Yes | No |
|---|---|
REPAIR as necessary. REFER to the Workshop Manual Section 303-00, Engine System. Clear the PCM DTCs. REPEAT the self-test. | For DTCs P0300 or P0316, GO to HD17 . For all others, GO to HD15 . |
HD15 CHECK FUEL INJECTORS
Note: For vehicles without the injector disable PIDs, follow the Yes answer.
• Ignition ON, engine running.
• Access the PCM and control the suspect INJ_OFF (MODE) PID.
• Command the suspect injector OFF.
Does the engine RPM change?
Yes | No |
|---|---|
GO to HD17 . | CHECK the suspect fuel injector connector and pins for damage, corrosion or an incorrect connection. If no concerns are present, INSTALL a new Fuel Injector. Clear the PCM DTCs. REPEAT the self-test. |
HD16 CHECK THE CMP SENSOR
• Ignition ON, engine running.
• Access the PCM and monitor the SYNC (MODE) PID.
Is a concern present?
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.